A WebAssign Review for your final exam has been posted.  (It's called "Honors Chemistry Review 1".)  This is NOT a required assignment, just a tool you can use to study for your final.  It will show the correct answer to each question after 3 submissions.

Remember to prepare your "cheat sheet" notecard to use on the final.  Handwriting only, no typed notes!

The Period 5 final begins on Wednesday at 12:20 pm.  
The Period 4 final begins on Thursday at 10 am.

Try to arrive at least 5 minutes before your scheduled final exam to give yourself time to get settled.

GOOD LUCK STUDYING!!!  WE ARE ALMOST THERE!!!

The key to the redox review packet as well as the key to the extra redox balancing practice sheet have been posted in the Unit 11 Keys folder.  Study session tomorrow at 7 am in the classroom.

Don't forget your WebAssign and good luck studying tonight!

Hi, Honors Chem, I completely forgot to tell you that MONDAY IS A CHEM DAY!  Yes, you get to go to a Chem Day...finally.  There will be a sign on the classroom door to remind you, but during our regularly scheduled class period, GO TO THE LYCEUM.  Be sure to complete the handout that goes with the video and hand it in to the substitute teacher (that's my attendance, so if you don't hand one in you will be marked absent).  

Please spread the word and enjoy Chem Day on Monday!

:) Ms. F

Thursday May 15, 2014

Hello Fellow Chem-mates....

In class on this beautiful day, we practiced some more with voltaic cells and determining which substances undergo reduction and which ones go through oxidation. When trying to figure out which one participates in which equation, there is a list of Standard Reduction Potentials in the packet we have been doing. Ms. Friedmann posted videos yesterday on moodle on calculating voltages in a voltaic cell. There should be a video of what today's lesson was on I think, but essentially today's lesson was a continuation of yesterday's lesson.

One new thing we learned today was the process of Electrolysis. We did not go over it thoroughly, but we discussed the concept in class a bit. When doing some of the voltaic cell problems, some of them ended up with a negative voltage value. This means that instead of producing electricity, it consumes it. This is electrolysis.

Homework:

1. Complete the WebAssigns that are due tonight
2. Finish page 7 in the packet (1pt Extra Credit = page 8)
3. Bring in a citric fruit and read the Fruit Battery Lab for tomorrow (in the Unit 11 Labs folder)

Next Blogger will be.......

May 13, 2014

So, when we came into fifth period, Mrs. Friedmann checked in our homework.  She also said not to worry if we didn't understand the two redox equations that were homework because they were complicated.  The answers to them were...

      a. Na2Cr2O7 + 2HNO3 + 7H2O2 -> 2H3CrO8 + 2NaNO3 + 5H2O

      b. 3K2MnO4 + 4HNO3 -> 2KMnO4 + MnO2 + 4KNO3 + 2H2O


We also went over the homework on page two in the packet.  Then, we completed page 4 in the same packet.  I am pretty sure that Mrs. Friedmann will put these notes on moodle.


Finally, our homework is problems d and e on page 3 in the same packet.  Also, there is a webassign due tonight.  There are also two webassigns due tomorrow night.  One of these (called Redox equations) is for extra points that can be added on to our test.  Don't forget to add some easy points onto your grade!!

                                                               Here's a chemistry joke.

Voltaic Cells

May 12, 2014

We started class of by NOT turning in our take-home quizzes.  Instead of turning all of our work in, Mrs. Friedmann simply has us write down our answers to certain problems on a half sheet of paper so that it's easier for her to grade.

Mrs. Friedmann also explained the extra work that is now available to help boost your last test score. All you have to do is complete the WebAssign named Redox Quiz.  This assignment is due Wednesday night at 11:59.  The overall assignment is worth 10 points, and how it works is whatever you get on the WebAssign will then be added to your raw test score.  So, for example, if you got a 65/80 on your test and an 8/10 on the WebAssign, your new test score would be a 73/80.  Since this assignment can do nothing but help our grades, Mrs. Friedmann recommends that we all give it a try!

In class we started to learn about voltaic (galvanic) cells. We picked up a packet in the beginning of class and used that to take notes, so if you were absent make sure to print it out from the handouts folder! The notes aren't posted, but make sure to copy mine down if you don't have them written down.  We also used several colors to take notes with as an easy way to distinguish between reductions and oxidations.

Homework
1. Complete the top section of page 1 of the packet.  Make sure to show your work in your journal and write your final answer in the space provided on the packet.
2. Complete page 2 of the packet
3. Start on your WebAssigns! We have one due tomorrow night as well as one due Wednesday night.

The next blogger is... Elyana M.

5/9/14 Class

To start class, Mrs. Friedmann went over some homework questions from the worksheet on balancing redox reactions in acid/base solutions. Mrs. Friedmann also informed us that she has created a video going over numbers 3 and 4 that can be found on moodle. There is also a key to this entire worksheet on moodle.

We had a quiz that Mrs. Friedmann allowed us to take home to complete for homework. 

We also discussed another resource that can help us understand the unit so far called Kahn Academy Here's the link... https://www.khanacademy.org/

Homework:
Take home quiz!

4 Webassigns...

Next Blogger.....Pamela H. 

Balancing Redox Equations

Balancing Redox Equations
Scribe Post by Juliette O. (Quarter 4)
5/7/14

Agenda

First, we checked in the homework due today, the three page Electrochemistry worksheet. We then picked up three worksheets for homework, "Forming Ionic Compounds" and "Balancing Redox Equations." Then we went over the Electrochemistry worksheet. Finally, we took notes on Balancing Redox Equations in Acid-- these notes are posted on moodle. A video going over the notes will also be posted on moodle. 

Introduction

Mrs. Friedmann apologized that the tests have not been handed back yet, however she said the grades so far are quite poor. While it is the end of the school year, Mrs. Friedmann urged us to push through and continue to put in consistent effort to hold on to our grades. She reminded us that understanding homework is invaluable for the test. She also said that there will be an opportunity to make up some points tomorrow.

Homework Check

We went over the Electrochemistry worksheet in class today. 

Remember:

• Assume oxygen is not peroxide when you see O2-- assume the oxygen has an oxidation state of -2. 
• When asked to determine oxidation states of reactants and products of a reaction, start by tallying the oxidation numbers. For instance, in 2a, the substance oxidized in S in H2S, not S-2, because S is not an ion. Just because there is a -2 oxidation state does not mean there is a -2 charge--oxidation state and charge are not the same!  
• Remember, the chemical that contains the thing that is being reduced is the oxidizing agent.
• In 2d, remember that if there are 3 reactants on one side, you can identify what substance is being oxidized/reduced by identifying the oxidation numbers and seeing if there is a change in oxidation state. If there is a change in ox. state, the substance is oxidized or reduced. 
• Acronym to remember: LEORA GEROA 

Notes

See moodle for notes and a video going over the notes is also posted.

Link to Notes: http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/13_14_Unit_11_--_Redox/Unit_11_Notes/3_Class_Notes_5.7.14.pdf 

Link to Video: http://vimeo.com/94433376

Homework

• 2 worksheets: Forming Ionic Compounds and Balancing Redox Equations (#1 and 3 in notes) Link: http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/13_14_Unit_11_--_Redox/Unit_11_Handouts/5.7_Balancing_Redox_HW_1.pdf
• 4 Webassigns have been opened that are due over the course of the unit, the first due next week. Read ahead and use the text to finish the web assigns. W.A. due dates: May 13, 14, 19, 20

Class Blog 5/6/14

Half Reactions 5/6/14

Hello! today we started in class the homework, which was the chapter 4.4 worksheet and the Oxidation numbers worksheet. For homework tonight we have the three worksheets on Electrochemistry, found here. 

And here are two funny chem jokes. Please enjoy.

Today was a notes day in class. We followed Mrs. Friedmann as she took these incredible notes. 

The five main questions that need to be asked before determining Oxidation numbers are:

1) Is the substance an element

2) Is the substance ionic?

3) If ionic, are there monatomic ions?

4) Which elements have specific rules?

5) Solve for whats left!

I was very confused with Oxygen, as I am sure many others are. The Oxidation # for the Oxygen atom is almost always -2. Only when the charge for Oxygen is -1 and combined with another Oxygen atom (O2) is the Oxidation number -1. Ex: H2O2, Na2O2

Hope this helps!

Next Blogger: Juliet O.

Intro to Oxidation/Reduction Reactions - Monday May 5

To start off class, Mrs. Friedmann handed out three different worksheets. The first was a calendar for our LAST UNIT!!!! And the other two were worksheets we have to do for homework tonight.
    Mrs. Friedmann suggested reading chapter 4.4 in our book to help us fill out the reading sheet and complete the problems on the Oxidation Numbers worksheet.

Here's photos of the worksheets just in case she doesn't post them (and yes, they're due tomorrow):

But before you get started on these, read the the following notes that Mrs. Friedmann gave to us in class, as well as section 4.4 in the book:

Okay, to explain a couple things, the statue of liberty part is in my notes because Mrs. Friedmann used it as an example. See, the original statue was made of bronze, which we know is a reddish/brownish color right? Then how come the current statue is green? Well, that's because the outer layer of bronze on the statue reacted with the oxygen in the air, causing an oxidation reaction to occur in which the bronze lost electrons, causing it to actually turn into a different substance (just on the surface though). This is actually a good thing because now this new outer layer (which is no longer bronze and appears green) serves as a protective coating for the bronze interior of the statue.

And LEO and GER are just mnemonics for remembering that:
When molecule Loses Electrons it is Oxidized and
When a molecule Gains Electrons it is Reduced. (LEO the lion goes GER)

That's all! And the next blogger's Kevin Mihelic.

Acid-Base Titration Lab

     Today we did the titration lab demonstrated by Mrs. Friedman yesterday. Today's NaOH molarity was different than the demonstration and we were to do three trials and remove any results that were obviously deviant from the rest and then find the average molarity. A write-up is not necessary for this lab.

Here is the data for the lab:

Molarity of standard base used: 0.149M

Trial 1: 

HCl volume

• Initial- 10.4
• Final- 20.5
• Used- 10.1

NaOH volume

• Initial- 0.3
• Final- 14.2
• Used- 13.9

Molarity of acid- 2.05

Trial 2:

HCl volume

• Initial- 27.0
• Final- 37.0
• Used- 10.0

NaOH volume

• Initial- 27.3
• Final- 41.0
• Used- 13.7

Molarity of acid- 2.04

My third trial deviated from 1 and 2

--

The homework is to study for tomorrow's test. There will be a study session at 7 tomorrow.

The next blogger is...

Kevin M.

Titrations and More!

Tuesday and Wednesday April 29-30 2014

What we did in class (29th):

• Today in class we finished the indicator lab
• We went over the things that were due on THURSDAY for the lab
• Mrs. Friedman showed us an example problem that would have to do with the homework

What is due for the Lab:

• The Lab is due THURSDAY
• You need a typed data table, it's not required that the calculated pH's be on the type table
• You also need a sheet with all of the calculations required
• You need to do calculations for the following:
• .001 M HCl
• .001 M NaOH
• .001 M Acetic Acid
• .001 NH4OH
• .1 M NaCl
• .1 M Na3PO4

For Extra Credit you could do calculations for .1 M NaHSO3 and .1 M NaHCO3

Other Homework:

• The last two sheets of the packet on Acids and Bases
• This includes the two ICE Table questions on Buffers (which are done exactly the same way as common-ion problems) and the last sheet which is a general practice of ICE Tables
• These sheets are due WEDNESDAY

What we did in class (30th):

• We went over the last two sheets of the acids and bases packet
• Mrs. Friedman's computer crashed (condolences)
• We took notes on Neutralization Reactions and Titrations

Neutralization Reactions:

Acid + Base ---> Salt + Water

Ex. HCl + NaOH ---> NaCl + H2O

For every mole of H+ or H3O there should be one mole of OH to neutralize it = Titration

When you know the concentration of a base, you can find the concentration of the acid using Titration

Equivalence Point: When moles of H+ = moles of OH- = pH of 7

End Point: When the indicator is at it's faintest color possible

Overshoot: When the indicator color is too strong, you passed the end point

Calculation for Concentrations:

# of H's in the formula x Molarity of Acid x Volume of Acid = Molarity of Base x Volume of Base x # of OH-'s in the formula

Homework due Thursday:

• The lab as mentioned above
• Two practice problems that are on one of the lab sheets we received today

Next Blogger: Colin Samuels

Quiz Review

Friday, April 25, 2014
Blogger: Serene P.

Today, we began class with completing a worksheet in a group. It covered questions similar to the quiz we took on Thursday. Later, we went over the answers to this worksheet. To Georgia, Cameron, Juliette, and Hayden, you all will have to complete this worksheet when you return. 

After completing that worksheet, we made corrections to the quiz we took on Thursday. It was not taken for a grade since many people did not do so well. 

Homework:
There is one worksheet that has a problem similar to the worksheets that we were going over in class.
Also, there is a webassign that I believe is now due Monday. 

The next blogger is Daniel W. 

Quiz

April 24, 2014
Blogger: Serene P.

Due to the Juniors testing, we all had shortened periods today. Ms. Friedmann had us check in our homework on pages 10-11 at the start of class. Afterwards, we took the quiz that was over those pages. We did not go over the homework. 

Homework:
There is a webassign due Sunday night at 11:59 PM. 

I'll blog tomorrow as well. 

During class today Mrs. Friedmann recorded a video going over problems on pages 10 and 11 in the packet.  You can find this video on the moodle page.

She also went over the answers to the homework that you can find under the "keys" folder.

The homework is the 2 web assigns due wednesday night, and pages 10 and 11 in the packet, do all the problems Mrs. Friedmann did not go over.

There will be a quiz Thursday on problems like the ones on the homework.


the next blogger is... Serene P.

OK, so...the video on yesterday's lesson was supposed to be uploaded by 7 pm last night, so on the bright side I'm only 17 hours late.  Sorry!  The link is at the bottom of the Unit 10 box on Moodle.  Tomorrow's quiz will be a problem similar to questions 34 and 35 on pages 10 and 11 of the packet, which the video covers.

Don't forget to enjoy the sunshine!  :)  See you tomorrow.

Ms. F

Hi, class!  Given that we have not yet discussed buffers in detail in class yet, I have elected to move the deadline for the Buffers WebAssign to SUNDAY NIGHT, 11:59 pm.  The other WebAssign (on Kb and salts) is still due tomorrow night (Wednesday 4/23) by 11:59 pm.  By Thursday you should also have completed pages 10 and 11 in the packet...for those of you absent today a video of today's lesson will be posted by 7 pm tonight.  Quiz Thursday, during our 20 minute period (it will be a problem calculating the pH of a salt).

Happy ICEing!

Thursday, April 17th

Thursday, April 17th 2014!

Happy three-day weekend!

We began the class taking a quiz based on the weak acid/base ICE tables. This is not meant to be a super duper hard quiz, but reinforcing the idea. Hope everyone did acidllent! 

OH, if you have not taken this yet, please talk to Mrs. Friedmann pHSAP. 

With the second half of the class, we took notes in the packet. We completed a few examples on pages 6 and seven, which were not up on Moodle yet.


Homework:
Finish pages 6 and 7 of the packet and to have a great three-day weekend!

The next blogger will be…Mary L. 

Homework: Web Assign due tonight at 11:59 pm. & last 2 pages of the packet.

Today in class we went over our homework, packet pages 4-5. The packet and answer key can be found on Moodle in the Unit 7 handouts folder. Mrs. Friedmann also passed back and went over our quizzes.

**QUIZ TOMORROW ON ICE TABLES FOR STRONG AND WEAK ACIDS AND BASES**

Next Blogger: Lauren B.

Acids and Bases

An Overview of the Unit

Today in class Mrs. Friedmann went through a set of notes with us that was an overview of our current unit.  If you missed them, the notes can be found in the Unit 10 notes folder.  Mrs. Friedmann asks that you hold onto your big questions, because it would be easier for her to answer them at the same time that we're learning it. AKA big questions=big lesson.  We picked up a calendar and a packet today, which can be found in the Unit 10 handouts folder.  

and remember... hydrofluoric acid eats through pretty much everything, except plastic.

Bathtub Scene

Homework:

1. 2 web assigns due tonight at  11:59

2. Finish the acid/base properties lab write up

3. Complete the first three pages of the packet we received today. 

The next blogger is: Georgia A.

Acid/Base Properties Lab Data

Here is the data for the Acid/Base lab from Friday:

Conductivity
(1) HCL-- No
(2) HC2H3O2--No
(3) Distilled Water--No
(4) Ammonia--No
(5) NaOH--No

Litmus Paper

	Base Red	Base Blue
(1) HCL	No	Yes
(2) HC2H3O2	No	Yes
(3) Distilled Water	No	No
(4) Ammonia	Yes	No
(5) NaOH	Yes	No

pH Paper

	pH
(1) HCL	1
(2) HC2H3O2	3
(3) Distilled Water	7
(4) Ammonia	9
(5) NaOH	11

Phenolphthalein

	Observation
(1) HCL	White & Cloudy
(2) HC2H3O2	Clear
(3) Distilled Water	White & Cloudy
(4) Ammonia	Dark Purple
(5) NaOH	Bright Purple

Universal Indicator

	Observation
(1) HCL	Orange/Pink
(2) HC2H3O2	White/Red
(3) Distilled Water	Light Green/Yellow
(4) Ammonia	Purple
(5) NaOH	Turquoise

Carbonate

	Observation
(1) HCL	Reacting, bubbling
(2) HC2H3O2	None
(3) Distilled Water	None
(4) Ammonia	None
(5) NaOH	None

Magnesium

	Observation
(1) HCL	Reacting, bubbles quickly, fizzing, steams off
(2) HC2H3O2	Slower reaction
(3) Distilled Water	None
(4) Ammonia	None
(5) NaOH	None

The link to the video going over stuff for tomorrow's quiz on Le Chatelier and Ksp is now posted, check it out, especially if you were absent today (I'm talking to you, field trippers!)  It's at the bottom of the Unit 9 box on Moodle, for your viewing pleasure.  Popcorn optional.  :)

Prep for Quest

By: Katie Coy

Overview:
Hello all who were 'absent' (aka on an AP Euro field trip) today! We started off class today by talking about the homework question that was assigned last night. It was actually not a common ion problem, rather it was a solution stoichiometry problem from earlier in the year. We did not go over how to solve this problem in class and you will not have to know how to solve this problem on the Quest tomorrow. Speaking of the quiz... we do have a Quest on LeChatelier's Principle that TOMORROW! Ms. Friedmann is going to post a VIDEO that goes through all that we reviewed (we did not learn anything new) today. I currently do not see the video posted, but do not fret, Ms. Friedmann said she will post it as soon as it uploads. Keep checking the unit 9 box on the Moodle page for the video on today's lesson. If you do not want to watch the video, I will post a quick summary of all that we learned today... hope it is helpful. :)

What is going to be on the Quest:

1. LeChatelier's Principle- qualitative questions such as "If more CO is added to this equation, will it shift to the right or to the left?"   
2. Ksp common ion problems
3. Ksp problems
1. Calculate the concentrations of substances at equilibrium
2. Calculate Ksp using solubility- these can be found in the packet that we did, questions 8 a,b,c, and d.

Number two is what we went over today, since Ms. Friedmann felt that we could benefit from more information on common ion problems.

Common Ion Problems:

These are the problems in which we are dissolving a substance into something other than pure water. We went over an example problem that is explained in the video, so I will just talk about the steps that we took to solve the problem. 

Example one: What is the solubility of PbCl2 in 0.100 M MgCl2? The Ksp of PbCl2 is 1.7(10^-5). As one can see, the solubility (aka x) is what you should be solving for. Again, if you would like and explanation of this please visit the wonderful video Ms. Friedmann is going to post.

Solubility and Ksp Problems:

Another thing that we reviewed today was the formulas that we learned yesterday. Those formulas are:

# of ions produced:

2                                                  the square root of Ksp

3                                                  the cube root of Ksp/4

4                                                  the fourth root of Ksp/ 27 

These are used to figure out the solubility of equations without using the ICE tables. YOU SHOULD MEMORIZE these equations for tomorrow's quiz. Anyways, you may be wondering when we use these formulas. Well, when you are given a question that reads, 'Which of the following has the lowest solubility?' use the equations. Here are the notes that we took in class. Again, if you are confused on this topic, please consult Ms. Friedmann's video.

Homework:

1. Study for the Quest!

One other important thing, Ms. Friedmann wanted to tell everyone that she apologizes for not giving the usual homework so that we could prepare for the quest. With her busy life outside of school, it has been very hard for her to assign homework and to post items (like keys) on Moodle. She thanks all of us for being very patient. 

Good luck studying and the next blogger is.... Georgia.

Common Ion Problems...

Overview:
- Today we went over the Ksp packet in class and Mrs. Friedmann reviewed how to do each type of problem. She also added some notes to the last page of the packet. In addition Mrs. Friedmann told us about the upcoming science contest that we could participate in. Lastly we took some notes about solving common ion problems.

Science Contest: 
 - This is the same contest that some of you may have participated in groups last year. And although there will be no extra credit given for attending the event, it will still be a great experience that is worth much more than extra credit points!!!

Ksp Packet Review...
- Mrs. Friedmann went over how to do each problem in the packet, such as calculating concentrations, ksp, or S (solubility). All of these problems involve using the ICE methods and finding out the Ksp expression which is similar to finding Keg. This packet with the answers is posted on moodle.

Common Ice Problems...
- This method is used to solve solubility of substances in another solution (not in water like the ones in the Ksp packet).  This is important because instead of starting of with 0 on the product side, you start of with a certain concentration since the we are dealing with a certain solution not just plain water.
Here are the notes...

Homework...
-Answer this problem: How many grams of CaSO4 are formed when 20mL of 0.010M Na2SO4 are added to 100mL of 0.001M CaCl2.


Next Blogger is Katlin Coy...

The Solubility Product Constant

Overview:
- Today in class, Mrs.Friedmann had to leave urgently, so Mrs. Mandarino taught us the four pages of the solubility product constant packet that was passed out yesterday. We went over the first page that was assigned for homework.

- The new problems are similar to the ice problems, so you can use them as a reference to solve these.

Homework:
-No official homework besides finishing the next four pages of the packet.

Thursday April 3

Blogger: SUVd

Dear Period 5,
Today was a shortened day due to the fire drills, so our class 5 minutes shorter than usual. At the beginning of the class, Ms.Friedmann checked in our homework which were the two ICE sheets. We also turned in our typed Post-Lab Questions for the Le Chatelier's lab. Then we grabbed a packet from the usual front table. The first page was homework, and it will be checked in tomorrow (It's FRIDAY!!!!). Afterwards, we went over yesterday's homework and the test.  Oh yeah, lastly, Jordan found a lot of "Easter Eggs" with significant figures.

Sincerely,

Suvd D.

P.S Ambreen, you're next...

ICE paper

"Easter Egg"

Chatelier is right

http://en.wikipedia.org/wiki/List_of_Google_hoaxes_and_easter_eggs

                             

Kevin M

LeChatelier Lab

Homework:

          1: Finish ICE problems worksheets handed out yesterday. DUE tomorrow. Here is the worksheet

          2: Type the answers to the post lab questions. DUE tomorrow. Here is the lab

          3: If you did not watch the video and take notes last night. Do it tonight. Here is the link

We had a substitute today and we did the LeChatelier's Principle Lab. Before the lab, we went over the answers to the pre-lab but they are not on moodle yet so if you need to see the answers you must wait until class tomorrow. All of the procedure and information for the lab can be found in the link above. 

In the lab, we were able to see all of our recent work take effect in an actual reaction. We prepared 6 test tubes with Cobalt Chloride. We set A as the control tube and experimented with the others. To test tube B we added distilled water, which changed the color of the substance. It changed from blue to pink. This means that when H2O is added, the reaction moves to the left! I get excited about these things.

Here is the data Table:

Test Tube	Final Color
A	Clear Blue
B	Pink	In Hot Water: Back to Blue
C	Light Blue	In Cold Water: Back to Pink
D	Thick Blue at Bottom
E	Clear Purple
F	Cloudy Pink

Reminder to type the postlab for credit tomorrow. Don't forget the ICE problems!

Next Blogger is: Suvd

Happy April Fools Day!

Happy April Fools Day!

The first thing we did in class was check in the homework from last night and tape into our journals the lab and the ICE problems worksheet. Next, we took a partner quiz on Le Chatelier's principle. Then we went over the homework from the night before.

Tonight's homework assignments are:

1. the WebAssign due tonight at 11:59
2. the pre-lab for the Le Chatelier's principle lab
3. watch this video and take notes on it
4. the ICE problems worksheet, due Thursday

The next blogger is: Kevin M

A Farewell and Le Chatelier's Principle

Mr. Jeff Yordy

As Dr. Wegley announced, Mr. Jeff Yordy of the science department passed away over the weekend. He taught biology and led horticulture to many achievements in his past 30 years at GBS. Mrs. Friedmann was very close with him. We all wish the best for his family, friends, and students! 

Le Chatelier's Principle

With regards to the chemistry class, it was a matter of note taking and concept grasping with Le Chatelier's Principle. These notes and 4 handouts will soon be up on the Moodle page somewhere in this resource page. We then moved on to complete the first two worksheets which will also be found in this page.*

*If the notes are not posted by the time you see this, here is a sloppy copy of mine:

 

Here is the key to the graphs and problems on the first two handout pages we got to in class:

Homework:

*Finish the 4 handouts given on Le Chatelier's Principle

*Complete the webassign due Tuesday night at 11:59 P.M.

The next blogger will be…(drumroll)…Brandon M.

Ice Day!

To start off class today, Mrs. Friedmann checked in our homework and we went over the homework.( keys are posted). In addition Mrs. Friedmann gave us an OPTIONAL worksheet that will help you with the ice problems. The sheet only functions as extra practice and will not be checked in, but it is recommended you do them to prepare for the test.

Ice, Ice, Baby!
- For the rest of the class Mrs. Friedmann introduced to us the last topic of this section which is: how to solve ice problems. I will not go in depth with the explanations since there is a video posted that goes over a good explanation on how to do the ice problems and there are notes as well. All can be found on the moodle page.

- In addition Mrs. Friedmann has posted the answer key to the review packet and a video that goes with it. It is recommended that you use these tools to study for the test tomorrow.

HOMEWORK:
- STUDY for test tomorrow!!--- good luck

This is what will happen to our brains after the test tomorrow!!!

NEXT BLOGGER: Grace K.

Equilibrium Constant Calcs and "Q" Calculations

March 19, 2014

Scribe: Serene P. 

To begin class, Ms. Friedmann checked in our homework. She stated that we each earned two more points on our previous chemistry test due to someone finding an error in the test’s answers.

We were not assigned any more webassigns. However, our unit test will be this Friday. We were given the unit review packet, and the answers will be posted soon along with a video. You will not be able to do questions 26 or 27 tonight, but you can attempt doing so by previewing tomorrow’s notes that are in moodle.

http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_9_--_Equilibrium/Unit_9_Handouts/3.19_Kinetics_Equilibrium_Review_Packet.pdf

We also picked up a worksheet titled “Q” Calculations which was homework.

We first corrected the “equilibrium expressions” worksheet. Instead of taking down the notes, Ms. Friedmann went through her pre-written note sheets that are posted on moodle.

We also looked through two of the worksheets that we had picked up yesterday titled “equilibrium constant calcs” and went through a few of the problems together. However, problems 3,4,6, and 8 are assigned as homework tonight.

http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_9_--_Equilibrium/Unit_9_Handouts/3.18_Keq_and_Q_Calcs_Ws.pdf

Here are the notes from today:

http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_9_--_Equilibrium/Unit_9_Notes/3_Notes_on_Equilibrium_Constant.pdf

and..

http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_9_--_Equilibrium/Unit_9_Notes/4_Notes_on_Q.pdf

Tonight’s homework:

Optional Review Packet, video and key to be posted soon

Unit Test Friday

Q calculations worksheet

Finish problems 3,4,6,and 8 of equilibrium constant calcs worksheet

The next blogger will be Ambreen A.

Continuing Equilibrium

Tuesday the 18th

By Hayden Northwick

We begun class by showing Mrs. Friedmann our graph, which was homework from the night before.  Then she handed back some graded work of ours including the latest typed up lab we did and also the packet we did at the beginning of the equilibrium unit when she wasn't there.  We spent the majority of the class time going over the packet. The key can be found in moodle or at this link.  

The only homework we have tonight is to do the 1st of the 3 worksheets we collected in class today for tomorrow.  

In the last 30 seconds of class, Mrs. Friedmann did a quick demo where she poured a liquid on the counter in a shamrock shape and lit it on fire.  It burned with a green tint. Happy belated St. Paddy's day.

The next blogger will be: Serene P.

Equilibrium Simulation

Equilibrium Simulation (Lab)

     Today we turned in the packet on rates of reactions that was due. We then went on to do a lab in class called Equilibrium Simulation. In this lab we used beads to represent atoms and molecules in order to simulate equilibrium. There were groups of three, in which one person represented the forward reaction by joining two beads together, the second person represented the backwards reaction by splitting them apart, and the third person timed the reactions. The data was then collected into a table which you can find in the Unit 9 Labs and Activities Section, or you can simply look below:

For homework we were supposed to graph the data and label it. That is all that is due tomorrow. The next blogger is: Hayden

Reaction Rates Investigation

Reaction Rates Investigation Lab

     On Friday we conducted the Reaction Rates Investigation, where we tried to determine how certain variable changes affected the rate of reaction of Alka-Seltzer and water. Here is the information you will need to fill out the sheet that is due MONDAY.

Effect of Temperature on Reaction Rate

Procedure:

• Take out a tablet of Alka-Seltzer and weigh it on a scale. Record the weight.
• Fill up 1/2 of the cup with either Hot/Room Temp./Cold water (pick one per trial)
• Measure the temperature of the water in the cup
• Put a tablet of Alka-Seltzer into the cup, place the cover on, and flip over the cup.
• Time from the point the Alka-Seltzer comes into contact with the water to the point when it pops.
• Record the time in you're data table.
• Do this 2 more times with the 2 remaining temperatures of water

Data Table:

TRIAL 1 (Room Temp.Water)

Weight of Alka-Seltzer: 2.20 grams

Temperature of Water: 21.1 Degrees Celsius

Reaction Time: 10.22 seconds

TRIAL 2 (Hot Water)

Weight of Alka-Seltzer: 1.95 grams

Temperature of Water: 55.0 Degrees Celsius

Reaction Time: 2.8 seconds

TRIAL 3 (Cold Water)

Weight of Alka-Seltzer: 2.05 grams

Temperature of Water: 3.8 Degrees Celsius

Reaction Time: 40.57 seconds

Conclusion: Base your conclusion on you're observations of the effect temperature has on reaction 

Effect of Surface Area on Reaction Rate

Procedure: 

• Take out an Alka-Seltzer Tablet, and split it into 3 chunks, 1 chunk, or ground in a Mortar and Pestle
• Weigh the Alka-Seltzer, record.
• Fill up 1/2 of you're cup with Room Temp. water.
• Measure temperature of the water, record.
• Put the Alka-Seltzer into the cup, cover, and flip.
• Record the time it takes from contact to the pop of the cup.
• Do this two more times with the other surface area options.

Data Table:

TRIAL 1 (Ground)

-Weight of Alka-Seltzer: .93 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 11.36 seconds

TRIAL 2 (3 chunks)

-Weight of Alka-Seltzer: 1.01 grams

-Temperature of Water: 21.1 Degrees Celsius

-Reaction Time: 14.21 seconds

TRIAL 3 (1 Chunk)

-Weight of Alka-Seltzer: 0.99 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 18.45 seconds

Conclusion: Base your conclusion on you're observation of the relationship the different surface areas have on the reaction time.

Effect of Concentration of Reactants on Reaction Rate

Procedure:

• Take out a tablet of Alka-Seltzer, weigh it and record.
• Fill up either 1/4, 1/2, or a full cup with Room Temp. water
• Record the temperature of the water
• Place the tablet into the water, cover, and flip
• Record the time it takes for the cup to pop
• Do this two more times for the 2 other concentrations of water.

Data Table:

TRIAL 1 (1/4 Cup)

-Weight of Alka-Seltzer: 1.69 grams

-Temperature of Water: 20.6 Degrees Celsius

-Reaction Time: 11.6 seconds

TRIAL 2 (1/2 Cup)

-Weight of Alka-Seltzer: 1.66 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 13.25 seconds

TRIAL 3 (Full Cup)

-Weight of Alka-Seltzer: 1.72 grams

-Temperature of Water: 20.9 Degrees Celsius

-Reaction Time: 8.3 seconds

Conclusion: Base your conclusion on you're observation of the effect changing the concentration has on reaction time. Our trial 3 may have been invalid considering the reaction time should have been longer than trial 1 and 2.

Homework

The packet that we filled about halfway on Thursday and this lab sheet are both due Monday. I didn't take a video of the pop, sorry ;(

Rate Expressions and Rate Constants

Rate Expressions and Rate Constants

          To start off, Mrs. Friedmann told us she was aware of the fact that there was a field trip tomorrow and that some people wouldn't be here. Tomorrow we will be doing a lab and those not here can use the data posted by Friday's blogger. We will not be doing a write-up for this Lab

       Rate Expressions and Rate Constants packet

          We worked together on the packet we got a couple days ago. The key to what we got through today can be found on moodle here. As the packet shows, there is an easy and hard way to do Example 1A. Mrs. Friedmann only showed us the hard way so we would know how to use it. We will always be able to use the easy way for the questions we will be given.

Homework

• Complete the Rate Expressions and Rate Constants packet by Monday
• Complete the lab worksheet by Monday
• There may be Webassigns for the weekend, but if there are they won't be due until Monday night

I'm hesitant to assign a next blogger because I don't know who is and isn't going on the field trip. We'll figure it out tomorrow.

Webassign error/ score readjust

For the third webassign on the last part of the chapter, the correct answer is the one with A and C.. Although webassign marks this answer as wrong, it is the correct one and Mrs. Friedmann will adjust the scores.  Don't worry :) and good luck!

Notes on Notes

Happy Tuesday Everyone!

Today, we took the allll the notes we neglected to take on Friday or Monday. The topics were collision theory, reaction mechanisms, reaction rate and factors affecting reaction rate. I give a short summary of each of them below, but you can find the real notes at http://GBS-Moodle.glenbrook225.org/moodle/mod/resource/view.php?id=86333

Collision Theory

When a reaction takes place, it is because molecules collide with each other at 1) the right speed and 2) the right orientation. The "activated complex" is this transition stage between reactants and products during a reaction. The "right speed" is otherwise none as the activation energy.

Reaction Mechanisms

A reaction does not happen all in one go; a series of steps makes a reaction happen. The "crash" happens, and then the old bonds break to form new bonds. The overall reaction, called the complex reaction, given on paper is just the end result, and many elementary or intermediate steps are taken to get there. 

Reaction Rate

This is a measure of how quickly the reactants in a reaction become products, or how much reactant is used over time. We will calculate this in units of molarity (mol/liter) per any unit of time (seconds, minutes, etc). The elementary steps of the reaction all have different required activation energies, and the step with the highest activation energy will take the longest to complete. This is called the rate-determining step, because it will be the factor that affects the speed of the reaction.

Factors Affecting Reaction Rate

Factors include: an increase in temperature, an increase in concentration (molarity), an increase in surface area, and the addition of a catalyst. A catalyst lowers the activation energy of certain slow elementary steps and can also provide different paths for a reaction to take, making it go faster.

Homework:

Check the answers to the equilibrium packet assigned yesterday (http://GBS-Moodle.glenbrook225.org/moodle/mod/resource/view.php?id=86334)

2 WebAssigns are due on Wednesday by 11:59 pm 

Equilibrium

Equilibrium and Sub Day!

Although Ms. Friedmann was not here today to show off her amazing teaching skills, we had a "sub" in class to "substitute" for her. For the whole class period, we worked on an interesting equilibrium packet.

Homework:

• Finish the Equilibrium packet for tomorrow
• Start working on the 3 WebAssigns that are all due Wednesday

Kinetics and Equilibrium

Introduction to Kinetics and Equilibrium Unit

Friday, March 7, 2014

Today's chemistry class was all about the "It's Friday" spirit. It all started with Ms. Friedmann and Kevin G. balancing on the edge of the counter with one foot. This demonstrated holding an equilibrium…

Instead of taking notes, Mrs. Friedmann thought it would be a good idea to demonstrate some bigs ideas of this unit by doing activities in the old pit. These activities involved the class following directions:

• We tried the have a balance between two groups of people; this was done by having the same number of people on a side, making it symmetrical. 
• We tried having a group of 11 and 8 and had a flow of people traveling from one side to other other. The same number of people walking from one side maintained the balance of 11 and 8 and was not symmetrical.
• We tried having the two balanced groups of people, but everyone was moving in constant motion on each side. After walking in circles for a few moments, we had still maintained a balance.
• We tried having two groups where one group had two people walk over simultaneously with one person from the other group. This switch-up eventually led to one person on one side and the rest of the class on the other. This ended up not maintaining the balance because a different number of people from each side walked during each pass.

Lessons Learned:

• What comes in, must go out
• Equilibrium does not mean symmetrical
• Chemical reactions may appear as if doing nothing but is maintaining equilibrium
• Dynamic Equilibrium always moves, but is also always balanced

Next we went back into the class, so Mrs. Friedmann could bring fire. I left class 5 minutes early, so if anyone wants to recap what happened there in the comments, that'd be great.

Homework:

1. 2 crash course videos that you need to watch and take BIG-IDEA-ONLY notes where this should only take up 2/3 or 1 journal page for both videos 

• https://www.youtube.com/watch?v=7qOFtL3VEBc&feature=youtu.be
• https://www.youtube.com/watch?v=g5wNg_dKsYY&feature=youtu.be

1. Unlike the calendar, Mrs. Friedmann will NOT be having us do a web assign over this weekend, but will be assigned at a later date.

The next blogger is…Cool Chris

Entropy, Spontaneous Reactions, and Gibbs Free Energy

Entropy, Spontaneous Reactions, and Gibbs Free Energy
Scribe Post by Juliette O.
3/4/14

Agenda

First, we turned in the Hess's Law Lab Write Up, and for those who did not finish on Friday the Thermochemistry quiz. We then picked up the three pages of notes on Entropy, Spontaneous Reactions, and Gibbs Free Energy, and the worksheet (2 sheets) for homework. These are posted on moodle. We were reminded that the test is on Thursday-- remember to print the review packet and study it. The video is posted, and there will be a study session at 7 in the morning on Thursday. Next, Mrs. Friedmann showed us a quick demonstration on entropy and we then went over the notes. Finally, we went over the first two problems on the homework.

Notes

Homework Questions 1 and 2

Introduction to Notes

• Enthalpy is the energy in the bonds of chemicals, but enthalpy and entropy changes allow us to predict if the reactions reacts spontaneously.
• Entropy: measure of disorder in the universe, as in all the systems and surroundings 
• Processes increase disorder. 

Demonstration and Notes

Mrs. Friedmann took out a deck of UNO cards and spread them out haphazardly on the table. She pointed out that without work, someone physically organizing them, if thrown out on the table the cards are unlikely to end up in a neat stack. Work is required for that to happen. The universe is more likely to fall into disorder than order because of this. 

Order <---Requires Work-------Naturally Occurring--> Disorder

• Spontaneity=disorder, and you need work to get order.
• Example: my room had increased entropy at the end of the week! 

Mrs. Friedmann then split the deck of cards in half and put an organized half on the left side of the room and the disordered on the right side of the room. If the messy, disordered deck is on the right and the ordered deck on the left, the disordered in the products have a higher entropy. Therefore, if entropy is higher on products and lower on the reactants side, + number for delta S. 

REACTANTS --------> PRODUCTS         Spontaneous and Positive (the universe is naturally 

less entropy                       more entropy      like this b/c it is more likely to land in disorder)

more entropy                    less entropy         Negative number for delta S

• Example of a spontaneous reaction: fire burning-- it will continue burning and will light in the right conditions.
• However, many spontaneous reactions happen slowly, for example, the reactions in the body are spontaneous but occur slowly. Enzymes speed up these reactions by decreasing the activation energy in our body. Even when enzymes are involved as catalysts, the reaction is still spontaneous! 

Crash Course on Entropy:

Homework

• 3 Webassigns, two due tonight, one due tomorrow
• Worksheet (2 sheets; questions 1 and 2 done in class, 3 and 4 to be finished individually)
• Work on review packet! The video is posted on moodle.
• Study for test Thursday! Study session is at 7 AM Thursday morning. 

Heats of Reaction and Hess's Law

Heats of Reaction and Hess's Law

By: Grace Kilpatrick

Hi everyone! I hope you all are having a wonderful Thursday! Here is how class went today...

-First, Mrs. Friedmann checked in last night's homework. This was the Hess's Law-Practice worksheet and the Hess's Law worksheet, both which can be found in the Unit 8 Handouts folder. Due to time constraints, we did not have time to go over these in class. However, it is part of the homework to check the answer key to these worksheets, which is labeled as 5_Key_to_Hesss_Law_HW.pdf in the Unit 8 Keys Folder.

-Next, we went over the Heats of Reaction and Hess's Law pre-lab. These are the notes:

-For the rest of the period, we worked with a partner to collect experimental data for the Heats of Reaction and Hess's Law Lab. Mrs. Friedmann has uploaded lab data to use if you were absent in the Unit 8 Labs and Activities. This is my group's data. The upper portion is that data collected for reaction #1, where the lower portion is that data collected for reaction #2.

HOMEWORK:

-Check last night's homework with the answer keys online.

-See Webassign for the "Chapt. 9.1-2 - Solids and Liquids - Rdg Sheet" assignment due March 4th, at 11:59 PM

-Begin working on write up for today's lab-likely to be due Tuesday.

The next blogger will be...Juliette O.!