
Stoichiometry Test Review
Authored by Ashley Brady
Chemistry
9th - 12th Grade
NGSS covered
Used 11+ times

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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a limiting reactant?
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
B2H6 + 3O2 -->2 HBO2 + 2 H2O
What mass of O2 will be needed to burn 36.1 g of B2H6?
62 g O2
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
2 KClO3 → 2 KCl + 3 O2
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
Tags
NGSS.HS-PS1-7
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
90.4%
104%
96.15%
1.04%
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Students recorded their observations below for before and after the reaction. The balanced equation can be found below: Al + CuSO4 --> AlSO4 + Cu. Determine which of the following is the limiting reactant and why.
Before Reaction: silver colored foil (aluminum) flat sheet, blue colored solution
After reaction: Rust colored solid with some silver solid within, solution is now clear
Copper sulfate is limiting because, after reaction, no copper sulfate is visible.
Copper sulfate is limiting because, after reaction, the solution has become blue, indicating the presence of a copper-containing compound.
Aluminum is limiting because, after reaction, no more aluminum remains.
Aluminum is limiting because, after reaction, the solution has become blue, indicating the presence of a copper-containing compound.
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