Answer Key Vocabulary: Avogadro’s number, balanced equation, cancel, coefficient,
conversion factor,
dimensional analysis, molar mass, mole, molecular mass, stoichiometry
Prior Knowledge Questions (Do these BEFORE usi
...
Answer Key Vocabulary: Avogadro’s number, balanced equation, cancel, coefficient,
conversion factor,
dimensional analysis, molar mass, mole, molecular mass, stoichiometry
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
[Note: The purpose of these questions is to activate prior knowledge and get students thinking.
Students are not expected to know the answers to the Prior Knowledge Questions.]
1. A 250 mL glass of orange juice contains 22 grams of sugar. How much sugar is in a twoliter (2,000 mL) bottle of orange juice? 176 grams of sugar
2. It requires two sticks of butter to make a batch of 20 cookies. How much butter will it
take to make 150 cookies? 15 sticks of butter
Gizmo Warm-up
Just as a cook follows a recipe to decide how much of each ingredient to add, a chemist uses
stoichiometry to determine the amounts of substances involved in chemical reactions. The
Stoichiometry Gizmo allows you to try your hand at figuring out the amounts of reactants and
products that take part in a chemical reaction.
To begin, check that this equation is shown: Fe2O3 + 3CO2Fe + 3CO2
1. Look at the coefficients (such as the “3” in 3CO) in front of each substance in the
equation. The coefficients tell you how many molecules or atoms take part in a chemical
reaction. In the spaces below, list the number of each molecule or atom in the equation:
Fe2O3 1 CO 3 Fe 2 CO2 3
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