Unit 9 - Stoichiometry

The Math of Chemical Reactions

 

Please Note:

  1. The set up for the math in this unit of study is MORE important than a right numerical answer. Right answers with no shown set up is counted as completely WRONG. RIGHT set-ups with wrong numerical answers will get about 85% partial credit. Please work to learn and SHOW the procedures for problem solving!
  2. Bring your NON-graphing calculator to class each day for this unit.

 

Your lab work will require you to use problem solving skills from lecture.

Labs must be read before class, you must actively try to understand as you do it in class, and conclude your efforts after the class. Lab reports will be written but lab calculations will count for a major percentage of the grade .

 

Text web site: http://www.glencoe.com/sec/science/chemistry/mc/wwwlinks/index12.shtml

  • From the text — Chapter 12 and Chapter 14 pg 430-433

  • Section 12-1 Mole ratios— read and try 6 & 7 pg 357

  • Section 12-2 Calculating mass/mass and mole/mass problems - read and try 9-14

  • Section 14-2 — Molar Volume of a Gas - read and review problem page 431 try pg 432 #24,25,29,30,31

  • Section 12-3 - Limiting Reactants - read and study examples. Try 20, 22, 23, 24, 25

  • Section 12-4 Yield— read and try 27,28,30,32,33,34

 

Activities

  • Text assignments as listed
  • Mole — Mole Ratios — class worksheets
  • Mass — Mass Problems Worksheet 11-2
  • Problem Solving Flow Chart - reference
  • Lab pg 30— Molar Volume of Hydrogen Gas
  • Limiting Reactants — wkst 11-3
  • Limiting Reactants — wkst 9.3
  • Lab pg 32— Mole Relationship in a Chemical Reaction
  • Lab pg 34 - Determining percent yield
  • Unit Test
Monday Tuesday Wednesday Thursday Friday

March 2

Mole-mole practice, Mole to mass, and Mass-mass practice

HW: Read Section 12-1 Mole ratio, read and try 6 & 7 pg 357. Read Section 12-2 Calculating mass/mass and mole/mass problems - read and try 9-14 and complete worksheet 11-2 through No. 9

3

Gas volume / molar volume relationships

HW: Section 14-2 —Molar Volume of a Gas - read and review problem page 431. Try pg 432 #24,25,29,31,30. Complete work sheet 11-2, No. 10 - 25 and wrsht 9.2

Read and prep for lab.

4

Gas Volume Lab

5

Complete Lab and work on Post-Lab Questions

 

Extra Credit Approval required by no later than 3:30 pm tomorrow!

6

Additional Practice for Stoich equations

HW: Section 12-3 - Limiting Reactants - read and study examples. Try 20, 22, 23, 24, 25

Extra Credit Approval required by 3:30 pm today

9

Gas Volume Lab Due

Limiting Reactants

Extra credit due 8:30AM

HW: Section 12-4 Yield— read and try 27,28,30,32,33,34 and complete 11-3, front page

HW1, 2, 3, 4, 5, 6

10

 

Percent Yield Calculations

HW: Complete 11-3 back page

 

 

11

Possible Daily 5

Problems on Limiting Reactants and Percent Yield

HW: Read and prep for NaHCO3 lab.. Complete wsht 9.3 if not finished in class.

12

NaHCO3 lab

13

NaHCO3 lab

HW: Read and prep for %Yield including a Pre-lab quiz

End of 3rd Quarter

16

NaHCO3 Lab Report Due

Yield lab

Including pre-lab quiz

 

17

St. Patrick's Day

 

18

Yield Lab

Review and conclude

HW: Study for test

19

Unit 9 Test

20

Yield Lab due at end of class

End of 3rd Quarter

Web Links for Practice and Study

Basic Mass - Mass and Mole ratio information

Everything you need to know!

 http://dbhs.wvusd.k12.ca.us/webdocs/Stoichiometry/Stoichiometry.html

Mole ratios are found from balanced chemical equations - Hopefully you now see why knowing how to write equations is important!

If you stuggled with how to write ionic and molecular formulas, please click here to find the old calendars and links to some great material you might wish you had spent more time with back in the fall

Ionic Bonding Page

Covalent Bonding Page

Mole ratios show amount relationships between reactants and products using the coefficients of an equation. They will be used to relate material in a reaction when trying to determine amounts of reactants and products involved in a chemical reaction.

This site is very much like your class presentation of material

http://dbhs.wvusd.k12.ca.us/webdocs/Stoichiometry/Mole-Mole.html

this may be helpful also - http://www.chem.umd.edu/reacts/Lesson_sample/Molelesson.html

 

How do I do these problems?

This site may answer questions you have about how to use equations in calculations.

 
http://www.csubak.edu/~mdutton/u3faqs.html -
Limiting reactants

http://www.science.uwaterloo.ca/~cchieh/cact/c120/stoichio.html

A quiz that checks as you go
http://gemini.tntech.edu/~snorthrup/chem111/tutorials/chap3b/start.html

 

Don't forget your text book has practice questions that will give you instant feedback on how you are doing!

 

 http://glencoe.mcgraw-hill.com/sites/0078664187/student_view0/self-check_quizzes.html

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