Student Exploration: Stoichiometry Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: Avogadro’s number, balan ced equation, cancel, coefficient, conversion factor, dimensional analysis, molar mass, mole, molecul...
Student Exploration: Stoichiometry
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. A 250 mL glass of orange juice contains 22 grams of sugar. How much sugar is in a two-liter (2,000 mL)
bottle of orange juice? 176g
m
er as
2. It requires two sticks of butter to make a batch of 20 cookies. How much butter will it take to make 150
co
eH w
cookies? 15 sticks
o.
Gizmo Warm-up rs e
ou urc
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
o
Stoichiometry Gizmo allows you to try your hand at figuring out
aC s
the amounts of reactants and products that take part in a
vi y re
chemical reaction.
To begin, check that this equation is shown:
ed d
Fe2O3 + 3CO 2Fe + 3CO2
ar stu
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:
is
Th
Fe2O3 1 CO 3 Fe 2 CO2 3
2. In a balanced equation, the same number of each kind of atom is shown on each side of the equation.
Calculate the number of iron (Fe), oxygen (O), and carbon atoms (C).
sh
Reactants Iron: 2 Oxygen: 6 Carbon: 3
Products Iron: 2 Oxygen: 6 Carbon: 3
Based on these values, is the equation balanced? Yes
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