Yield

11/15/2011

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_Actual, theoretical, and percentage yield all represent the amount of product in a chemical reaction.  Read p.260-264 in the text for help. 
Homework:  p.262 #31, 32; p.264 #36

Unit test is changed to next Monday.
 
_Read the text, p.251-257, including example problems.  Note the steps to follow in solving problems, on p.256 in margin.
Homework:  p.254 #23-25; p.258 #30ac; p259 #7
The note for tomorrow's class is on the unit 3 page of this site as "yield lesson".
 
We went over how to find the limiting reactant.  There is no new homework, just finish yesterday's homework.
 
You usually have more of at least one ingredient in your house than is needed to make a recipe.  This ingredient is in excess.  Sometimes you barely have enough of an ingredient to make a recipe.  This ingredient is your limiting ingredient because it limits the amount you can make.  Consult the text p.251-252, and if you were absent today, do the "Thought Lab" on p.252.  The unit test is next Wednesday.
Homework:  Answer the questions on the handout.  Answers are in brackets.  These questions are available on the unit 3 page of the grade 11 section of this site under the title "Limiting Reactant Problems".
 
Read p.241-248 for help with this concept.
The Unit 3 Test will be on Wenesday, November 16.  Review questions include:  p.30 #7-9; p.170 #2; p.193 #3, 7, 13de, 14ac, 17ce, 22, 31; p.229-231 #5, 7b, 8, 11, 14, 14, 19, 20, 25, 29; p.271-273 #5, 6, 9, 13, 15
Homework:  p.244 #11; p.246 #16, 17; p.250 #4
 
You can change relative amounts of recipe ingredients to make different amounts of food.  In the same way, you can change relative amounts of reactants or products in balanced equations.  See the text p.234-240.  The note used in class can be downloaded from the unit 3 page of this site.
Homework:  p.238 #5, 6; read example problem p.239-240 then answer p.240 #8, 9
The Unit 3 Test is on Wed., Nov.16.  Review topics and questions are on the unit 3 page.
 
The instructions for the experiment are on p.226-227.  For the Discussion of the lab report answer #1, 3, 4, 6-8 on p. 227.  The lab report is due on Wednesday.
Homework:  Complete at least #1, 3 from the discussion so you can share your answers with the rest of the class tomorrow.  This is necessary to be able to answer #6.
NOTE:  tomorrow's note can be downloaded from the unit 3 page of this site for you to bring to class - it is called "stoichiometry lesson"
 
We finished talking about molecular formulas.  The text reference for today's lesson is p.215-217, p.223-225.
Homework:  p.218 #17-19; p.225 #23-25; p.228 #6; Read the experiment on p. 226-227 and make a hypothesis (see Prediction, p.226); the observation table should have a stir rod included in the masses.
 
Empirical formula is found from experimental data and is the lowest terms formula of the compound.  Molecular formula is the actual compound formula without having the subscripts reduced to lowest terms.  The text reference for today's work is p.207-218.  There is a quiz on Friday that counts for marks on mole calculations.
Homework:  p.209#10; p.211 #15, 16; p.214 #3;
 
We made cookies today.  There will be a practice quiz tomorrow and a real quiz on Friday for mole calculations. 
Homework:  p.192 #2-5; p.193-195 #13ac, 14acd, 16ab, 17ab, 21, 31