Chapter 12

Section 12.1

- What does a cookie recipe tell you?
- How is a balanced equation like a recipe?
- How is building a tricycle like a balanced equation?
- What do chemists use a balanced equation for?
- What does quantity usually mean?
- What is stoichiometry?
- How can a balanced equation be interpreted in terms of atoms?
- How can a balanced equation be interpreted in terms of molecules?
- How can a balanced equation be interpreted in terms of moles?
- How can a balanced equation be interpreted in terms of mass?
- How can a balanced equation be interpreted in terms of volume?
- What is conserved in every chemical reaction?

Section 12.2

- Where do you get the numbers for a mole ratio?
- What can the mole ratio be used for?
- How is the amount of substance usually measured?
- What do they do with the mass?
- What are the steps for a mass-mass problem?
- When is the first step skipped?
- When is the last conversion factor skipped?
- How is the typical stoichiometry problem solved?
- For reactions involving gases what do the coefficients indicate?
- What happened to the 22.4 L/mole factors in sample problem 12.5?

Section 12.3

- What limited the amount of lasagna in their example? Why?
- What will limit the amount of product in a reaction?
- What is a limiting reagent?
- What is an excess reagent?
- In Sample 12.7 Why was copper the limiting reagent even though they had less sulfur?
- What is a theoretical yield?
- What is the actual yield?
- What is the percent yield?
- What does the percent yield measure?
- Why would percent yields be less than 100%?