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.