DMA: 31609

1
DMA 3/16/09

• What is the formula mass of CO2?
• What is the molar mass of CO2?
• How many molecules are in a mole of CO2?
• Go PURDUE BOILERMAKERS!!!!
• Go WASHINGTON HUSKIES!!!

2
11-1 What is Stoichiometry?

• Vocabulary
• Stoichiometry is the study of the quantitative,
  or measurable, relationships that exist in
  chemical formulas and chemical reactions.
• Rewrite this definition in your own words.
• What is the stoichiometry of a smore?
• Come up with your own example of stoichiometry
  and draw in your notebook.

3
11-1 Interpreting Balanced Chemical Equations

• Balance the following chemical equation in your
  notebook
• H202 ? O2 H2O
• What kind of chemical reaction is this?
• What is the chemical equation telling you?
• How many moles of H202 are required to produce a
  mole of O2?

4
Sample Problem 1 (pg. 352)

• How many moles of HCl are needed to react with
  2.3 moles of Zn? The equation for this reaction
  is
• 2 HCl Zn ? ZnCl2 H2
• Complete Practice Problems 1-2 (pg. 352) in your
  notebook.
• Do you have any questions or concerns?
• Homework 11-1 SRQs 1-4 Problem Bank Questions
  (pg. 378) 29, 31 and 33.

5
DMA 3/18/09

• The law of conservation of matter states that
  matter is neither created or destroyed in any
  process (such as a chemical reaction).
• How can you verify that matter and mass are not
  created or destroyed in the following chemical
  reaction
• 2 H2 O2 ? 2 H2O

6
Agenda

• Questions/Concerns about
• 11-1 Section Review Questions,
• Practice Problems 1-2 or
• Problem Bank Problems 29, 31 or 33?
• 11-2 Solving Stoichiometry Problems
• Class Work/Homework

7
11-2 Solving Stoichiometry Problems

• The major categories of stoichiometry problems
  are
• Mass to mass
• Mass to volume
• Volume to volume
• Copy Figure 11-9 (pg. 354) into your notebook.
• Lets work through Sample Problem 2 (pg. 357) as
  a class, and copy into your notebook.
• In pairs, work through Practice Problems 3 4
  (pg. 357) in your notebooks.
• Questions/Concerns?
• Classwork/Homework Problem Bank 35, 37 39

8
DMA 3/23/09

• An iron nail will react with a solution of copper
  (II) chloride. If this is a single replacement
  reaction, write out the chemical equation with
  reactants and products.

9
Prelab Questions

• How much copper metal should be formed when _____
  grams of Fe (nails) reacts with a solution of
  copper chloride?
• How much copper metal should be formed when _____
  grams of the copper chloride reacts with Fe
  (nails)?

10
Homework 3/23/09

• Practice Problems 9 (368) 13 (372).