"Thermodynamics is a funny subject..."

If you have not already done so, finish the homework page from Monday (Specific Heat worksheet)
For Review:

Read textbook 10.6, work the self-check
 and answer questions 22-28 and 29-31. ( Also review key terms and summary on page 317). My answers will be below...soon.  Also, could you email me to let me know how you are doing on this latest bit of math  (Q=mc(delta)T and the new stuff).  And then back to Hank:

Last bit of homework, this worksheet: Bond Energies but just do problems 1-3, and optional, if you remember Lewis diagrams from middle school physical science, try 6 & 7.  Answers here  https://drive.google.com/file/d/0B07s3-bcUr7tdzBnNW9CdEJvaDA/edit?usp=sharing

************************************Weird Historical Twist*************
In the late 1940s, German theoretical physicist Arnold Sommerfeld, having previously written a series of books in physics: mechanics (1943), electrodynamics (1948), optics (1950), etc., was asked why he had never written a book on thermodynamics? The following is his humorous and  frequently quoted answer: [8] 

“Thermodynamics is a funny subject. The first time you go through it, you don't understand it at all. The second time you go through it, you think you understand it, except for one or two small points. The third time you go through it, you know you don't understand it, but by that time you are so used to it, it doesn't bother you anymore.”

In an odd twist of fate to this quote, in April of 1951, while in the midst of writing a book on thermodynamics (Thermodynamics and Statistical Mechanics), and having been nominated 81 times for the Nobel Prize (more than any other physicist), but not yet having won, Sommerfeld was killed from injuries after a traffic accident while walking his grandchildren. The book was published post-humorously the following year. [9] 

Endo-exo

Homework is to complete the Energy Diagram  lab from class, as well as the two math worksheets also handed out.  The first worksheet is Temperature scales (converting between Fahrenheit, Celsius and Kelvin scales - if you need help, look in textbook 5.7 or online); the second worksheet is about specific heat capacity calculations.  The answers are linked at the bottom of the page. As you know, there may be errors.   These  worksheets should be finished by next Monday, but be sure to get going now so you can ask questions on Thursday if needed.

The textbook sections to cover is chapter 10.4-10.5.

Q = mcΔT

Q is the energy in joules

m is mass in grams

c is the specific heat (from the chart) and the unit is J/g°C (the textbook uses s instead of c) 

ΔT is the change in temperature in °C. It could be positive or negative.

Answers to Energy Diagram Lab, Temp. Scales, and Specific Heat  ***If/when you find errors, add comments.

You're getting hotter...

*******************************************************************************

Textbook Reading: Chapter 10.1-10.3 + answer the focus questions on page 293.

A very helpful Explanation of the Energy Diagram here. Copy the exothermic reaction graph, and make an endothermic graph, as directed at the end of the explanation.

***************************88************************************************************

lastly,

There's a Limit...

...to the amount of homework.
1. Limiting Reagent worksheet (last page of the handout)
2. 28 minute video - World of Chemistry 13. The Driving Forces 
Endothermic and exothermic reactions are investigated and the role of entropy is revealed.

Click the VoD button, and keep trying.  Take notes.

3. For next Monday, reading from What We Talk About When We Talk About God, ch.2 https://drive.google.com/file/d/0B07s3-bcUr7tSDlTN2h3UVNmRTg/edit?usp=sharing

Hopefully, you can read online. 40 short pages.

Problems may be frustrating...

but solving them can be satisfying.

Homework is the Percent Yield worksheet which was handed out in class.  Here it is if you happened to have misplaced it: http://www.csun.edu/~jte35633/worksheets/Chemistry/12-4PercentYield.pdf

I got up at 4am and finished it at 8am, so I know it is tough.  If you dig in for an hour and a half of concentrated attention, that would satisfy me, and we can finish next week. If you get on a roll, keep going.  However, it's hard to make progress if we expect to only "get it" in class, so give it a good shot.

To make it a little easier, here is an app for calculating the molar mass: molar mass calculator.

And the answer sheet has been done by me, so if you find my mistakes, please send me a note.

By the time I had finished, I developed a system: (Here is a form to do the homework out- print out 5 pages- don't worry, it takes very little ink.  Percent Yield workpage  and Answer sheet

1. Write the balanced equation.
2. Figure out the molar masses that will be needed; write in a box on the side. Under that write the actual yield, which is given in the problem.
3. For Questions 2, 3, 4,9 and 10, you need to find the limiting reactant.  Maybe you should do those last. Example 9.8 + the self-check 9.7 is the best example to follow (on page 275 and A20 in your text.) (oops, I had better check my work. I have some fixing to do on those.)
4. Write the equation:  on the left , the given in grams, and on the right, what you are trying to find:   
5.   3.74 g Na x ___________x____________x__________=[                 ] g Na2O2
6. Fill in all the molar masses and ratios. [grams>moles>>mole ratio>grams]
7. Calculate to find the theoretical yield.
8. Using the actual yield (given) and the theoretical yield (worked), calculate the percent yield.
9. Think: Does this seem right? Be alert for calculator problems.

If you want to try another video tutor, here's Brightstorm, which is a little different than my way:

Lastly, here is the solution page, again: 

Solutions to Percent Yield Worksheet

Please check your work as you go. 

***already 1 mistake, caught by Lily.

#9 -the limiting reactant is O2

the theoretical yield is 18.14gZnO

the percent yield is 80.4%

Also, Avery caught some mistakes (copying and calculator) in problems 2 and 7, listed in the comments below.  This is why we show our work!

These videos can help you understand the  homework, or you can just read the textbook 9.6-9.8, answer the end of chapter questions (all) for each section as you go, and solve just the problems in blue.  Answers for blues are in the back; keep working the problem till you get the right answer.  Show your work and always write your units, ALWAYS! (Don't misunderstand me by only watching  the videos- and please have ALL your chapter 9 homework to turn in on Thursday.)

Alternatively, you may prefer the explanations of a different tutor- IsaacsTEACH can be found here: 6.5 stoichiometry. 6.5 part 2, 6.6 Limiting reactants, and 6.7 Percent Yield

(Respond with comments if  like a particular tutor better...)

We will finish our Monday's lab in class on Thursday, but you may want to do the last page "Stoichiometry Calculations Worksheet".

and also

In retrospect, this chapter may have been tedious and it may have been frustrating,  BUT...by the end of the week, it will be DONE! And hopefully, instead of being tedious and frustrating, it will only be tedious.

for review: