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.

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

2/14/14

Thermochemistry and Other Long Words

By: Kevin Mihelic

We started class by collecting a valentines day gift from Mrs. Friedmann. This gift was filled with baking soda and vinegar and to inflate it we had to step on it. I had some trouble with this. We picked up 3 sheets. One was a lab, one was a sheet of calculations to do for homework. The homework due on Tuesday is:

1. Check Fridays homework with key posted on moodle.
2. WebAssign on heating curves
3. Finish Calorimetry pre-lab (blue sheet) -- find on moodle
4. Watch video on Enthalpy video on moodle and take notes.

For notes on Energy Diagrams and Activation energy click here- http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_8_--_Thermochemistry/Unit_8_Notes/2.14_Notes_on_Energy_Diagrams_and_Enthalpy.pdf

For the key to fridays homework here- http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_8_--_Thermochemistry/Unit_8_Keys/Key_to_Heating_Curve_Calcs_Ws.pdf

For the Calorimetry prelab- http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_8_--_Thermochemistry/Unit_8_Handouts/2.14_Heat_of_Combustion_Pre-Lab.pdf

On this sheet there are two difficult problems. These problems will be discussed in the comment section below this post. Please help even if you have trouble doing it- anything can help.

Fingers crossed for no school tomorrow!!!

Next Blogger is Brandon M.

November 4, 2013

Kevin M

Mrs. Friedmann

DA Overview

Today, upon entering the classroom, we took into our possession a packet and two sheets to be completed for the Homework. Although, due to time constraints, we were forced to finish the packet for homework as well (our lives are terrible). We completed the first two pages but there is still much left.

Today during class we spent most of DA time reviewing the homework. DA two homework assignments due today were the Webassign (which, sadly, is back) and the Solubility Curve Practice Problems (two pages). The answers for the Solubility Curve problems can be found in this link ( http://gbs-moodle.glenbrook225.org/moodle/file.php/12015/1314_Unit_4/Unit_4_Keys/1_Key_to_Solubility_Curve_Practice_Probs.pdf ). After reviewing the Homework, we moved onto Molarity

DA Molarity

The equation to find the Molarity of a solution can be found in this equation:

Moles of Solute

Liters of Solution

This equation is used to find the ratio of Moles to Liters. We had to complete the worksheet for homework

Da Game

DA BEARS managed to upset the Packers 27-20. Many thought that the Bears were not a strong enough opponent for Aaron Rodgers and the Packers (What is a packer?). HAH. Those people were wrong. Bears back-up quarterback Josh McGown was able to throw for 272 yards and 2 TD's. Bears are now 5-3 tied with the Packers and the Lions in this tricky NFC North division. Any person willing to argue with me about who the best team in the Division is may find me throughout the day. Enjoy my favorite fight song:

http://www.youtube.com/watch?v=SG8OpQyY6TI

And my favorite picture:

Metal, Nonmetal, Metalloid Lab

Post by: Kevin M
Date: 9/16/13

Today we started class by turning in our Beverage Density Lab. Ms. Friedmann then passed back our Unit 1 tests that we took on Thursday. The test was out of 80 points. The class did great by averaging 90% on the multiple choice section. If this impacts your grade negatively, don't worry! It is the first test and has a big impact on our grades at the moment but can easily be raised by the next test.

The Lab: The purpose of this lab is to investigate the physical and chemical properties of eight elements and to classify the elements as metals, nonmetals, or metalloids. 

     Prelab Answers:  1) Hydrochloric acid is corrosive to skin and eyes. Copper Chloride is toxic. Although these samples probably won't be a problem, protect youself. Hydrochloric acid could burn but most likely won't. The best defense against damage is to be careful and use the skills we learned in the beginning of the year. After the lab you should definitely wash your hands to be sure. If your skin was contacted, it would take a couple of minutes to visibly appear.

     2) Al- Aluminum- Marked as A
         C  - Carbon- Marked as B
         Fe- Iron- Marked as H
         Mg- Magnesium- Marked as F
         Si- Silicon- Marked as C
         S- Sulfur- Marked as E
         Sn- Tin- Marked as D
         Zn- Zinc- Marked as G

Example of Aluminum

    3) a. Physical property
        b. Physical property
        c. Chemical property
        d. Physical property
        e. Chemical property

        f. Chemical property

This Lab should include:

• Title- (example- Metal, NM, Metalloid Lab)
• Purpose- Can be one stated on the handout!
• Data Table- Data collected in Lab transferred to the google doc
• Questions- Answered in complete sentences!!!- Questions 1-5

This Lab is shared on a Google doc with your classmates. It is due tomorrow and will be turned in as a group.

The next scribe is.... Peter D.!!! Thanks Peter for taking it!