Chapter 9 Quiz

1
Chapter 9 Quiz

• 2K I2 ? 2KI
• 2. Find the molar mass of KI. (166.00 grams)
• 3. If 0.330 mol of potassium reacts, how many
  moles of iodine would react with it?
• 0.330 mol K x 1 mol I2 0.165 mol I2
• 2 mol K
• 4. How many grams if KI would be produced in 3?
• 0.330 mol K x 2 mol KI x 166.00 g KI
  54.8 g KI
• 2 mol K 1 mol
  KI
• 5. 19.2 g X 100 82.1
• 23.4 g

2
Chapter 9 Review

• Chemical Quantities

3
Concepts

• Law of Conservation of Matter
• What is conserved in a chemical reaction?
• Compound names and formulas
• What are the 3 categories?
• Metal nonmetal CaCl2, calcium chloride
• Metal (transition) nonmetal Fe3O2,
  Iron(II) oxide
• Nonmetal nonmetal CO2, carbon dioxide

4
Concepts

• Stoichiometry
• Using a balanced chemical equation to find
  relative masses of reactants and products
• Limiting reactant
• Is used up in the reaction
• When it is all gone, the reaction stops.
• Theoretical yield vs. actual yield
• Percent yield actual yield X 100
• theoretical

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Example1 What do we have and where do we go?

• 2H2O2 ? 2H2O O2
• If 0.11 moles of H2O2 react, how many moles of O2
  are produced?
• What and where?
• 0.11 mol H2O2 ? ? moles O2
• To solve
• mole H2O2 ? molar ratio ? mole O2

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Example 2 What do we have and where do we go?

• 2H2O2 ? 2H2O O2
• If 22.0 grams of H2O2 react, how many grams of O2
  are produced?
• What and where?
• 22.0 grams H2O2 ? ? grams O2
• To solve
• grams H2O2?mol H2O2?mole O2?grams O2

7
Example 3 What do we have and where do we go?

• 2 NaOH CO2 ? Na2CO3 H2O
• What mass of the product Na2CO3 is produced from
  the reaction of 15.0 grams NaOH and 10.0 grams
  CO2?
• What and where?
• 15.0 grams NaOH
• 10.0 grams CO2
• ? Mass of Na2CO3
• To solve
• Find limiting reactant.
• grams both reactant?mol both reactant?Limiting
  reactant?mol product?grams product

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Example 4 What do we have and where do we go?

• 2 NaOH CO2 ? Na2CO3 H2O
• If 12.0 grams Na2CO3 was made from 10.0 grams
  NaOH, what is the percent yield?
• What and where?
• 12.0 grams Na2CO3 (actual yield)
• 10.0 grams NaOH
• ? Percent yield (need theoretical yield)
• To solve
• g NaOH?moles NaOH?moles Na2CO3? g Na2CO3
  (theoretical yield)
• Percent yield