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Stoichiometry Pre/Post-Test
Try your best to answer the following questions. You will do this again after the unit work.
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Reaction Stoichiometry
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Your answer
Type in your last name
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Your answer
What is your class period
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B4
B2
B1
A4
Required
1. Knowing the mole ratio of a reactant and product in a chemical reaction would allow you to determine _____.
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1 point
the energy released in the reaction
the speed of the reactions
the mass of the product produced from a known mass of reactant
whether the reaction was reversable
Required
2. In the reactions 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, the the mole ratio of water to oxygen is _____.
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1 point
2:1
1:1
3:2
6:8
Required
3. In the reactions Al₂(SO₄)₃ + 3Ca(OH)₂ → 3CaSO₄ + 2Al(OH)₃, the the mole ratio of calcium hydroxide to aluminum hydroxide is _____.
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1 point
1:3
2:3
1:1
3:2
Required
4. For the reactions N₂ + 3H₂ → 2NH₃, how many moles of nitrogen are required to produce 18 moles of ammonia?
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1 point
9 mol
18 mol
27 mol
36 mol
Required
5. In the reactions A + B → C + D, if there is more reactant B than is required to completely react with all of A, then _____.
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1 point
A is the limiting reactant in the reaction
B is the limiting reactant in the reaction
there is no limiting reactant in the reaction
no product can be formed in the reaction
Required
6. If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the _____.
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1 point
theoretical yield
percent yield
mole ratio
actual yield
Required
7. The actual yield of a chemical reaction is _____.
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1 point
less than the theoretical yield
greater than the theoretical yield
equal to the percent yield
greater than the percent yield
Required
8. Fewer steps are required to solve stoichiometry problems when the reactant is given in _____ and the product is sought in _____.
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1 point
grams, grams
moles, moles
grams, liters
liters, number of atoms
Required
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