Stoichiometry Continued: Limiting Reactants 10/15

         When we walked into class today, we noticed that Mrs. Friedmann was not alone.  Her son Gabe had come to work with her!  Naturally, we wanted to get to know Gabe (who seemed to know more about chemistry then we did), but instead we got down to business.  We started off the class by going over last nights homework: stoichiometry worksheets 1 and 2.  The answers to these worksheets are as follows:

Stoichiometry Worksheet #1:

1.  a. 20 moles HCl
     b. 1.0 moles of HCl
     c. 0.171 moles of H2O

2. a. FeS + 2HCl ------> FeCl2 + H2S
    b. 12.5 moles HCl
    c. 2.5 moles FeS
    d. 0.0625 moles FeCl2

3. a. 56 moles N2O4
    b. 1100 grams (CH3)2N2H2
    c. 110 moles N2

Stoichiometry Worksheet #2:

1. a. 0.0445 moles N2
    b. 4.34 moles NO

2. a. 144 grams SO2
    b. 1.15 grams CS2
    c. 1.41 moles CO
    d. 2.87 grams C

          Mrs. Friedmann also complimented our solving skills on the problem that was posted on the blog, with special thanks to Serene and Georgia who helped us to solve a large portion of the problem, and to Valerie who pointed out a crucial step that we were missing.

          Then, it was announced that according to the calendar, a quiz had been scheduled for yesterday's class (10/14), but we had forgotten to take it. So....

We had a quiz today!

          However, our panic ceased when we saw the quiz, which just like Mrs. Friedmann had told us, mirrored the homework we had completed last night.  If you can complete those first two stoichiometry worksheets, you will have no trouble with the quiz. :) We were also told that this small quiz was not the last one that we would face in regards to stoichiometry; we will have a small quiz on the new stoichiometry material that we learn each day. The last quiz will be next Monday.

          Next, we had our lesson, and Mrs. Friedmann completed the first problem on both of the worksheets that are tonights homework.  Here is an analogy that will help for completing these worksheets:

Think of your balanced equation is your recipe.  Imagine that you are baking a cake.  You have 2 eggs and a bucket of flour.  The recipe calls for 2 eggs and a bit of flour.  While you have enough flour for multiple cakes, you only have enough eggs for one cake, so that is all you can make.

Tonights Homework: 

1. Finish Stoichiometry Worksheet #3 - there are 3 pages in the Unit 3 Handouts folder. Only do the 1st and 3rd pages. DO NOT DO THE SECOND PAGE
2. Complete the pre-lab questions for the lab that we have tomorrow.
3. Thoroughly read through the lab procedure so you are ready to go tomorrow!

Note: The lab write-up for this lab will be due on Monday.

The next blogger will be Kevin G.