 Stoichiometry
3 years ago
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Practice 20 QuestionsShow answers
• Question 1
30 seconds
Q. What is the first thing you must do to solve a stoichiometry problem?
Write a Balanced Equation
Panic
Write an Unbalanced Equation
• Question 2
30 seconds
Q. KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
2, 2, 1
2, 3, 2
1, 2, 2
1, 3, 1
• Question 3
30 seconds
Q. O2 + CS2 --> CO2 + SO2
What coefficient would go in front of the O2?
1
2
3
4
• Question 4
30 seconds
Q. WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
1
2
3
4
• Question 5
30 seconds
Q. WO3 + H2 --> W + H2O
What coefficient goes in front of H2?
1
2
3
4
• Question 6
30 seconds
Q.  The equation for Percent Yield:
(predicted/experimental) X 100
(experimental/predicted) X 100
(experimental - predicted)/ Predicted X 100
• Question 7
30 seconds
Q. True or False. You must convert grams to moles to do stoichiometry.
True
False
• Question 8
60 seconds
Q. 2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
4 moles
8 moles
16 moles
2 moles
• Question 9
60 seconds
Q. 2H2  +   O2  →  2H2O
How many moles of oxygen are consumed if 8 moles H2 are used?
2
4
6
8
• Question 10
30 seconds
Q. What is a Limiting Reagent?
speeds up a reaction
what you run out of first
what you have left over
slows down a reaction
• Question 11
30 seconds
Q. What is a Excess Reagent?
amount you end with
what you run out of first
what you have left over
• Question 12
45 seconds
Q. You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
jelly
peanut butter
sandwich
• Question 13
30 seconds
Q. For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of Mg to moles Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
• Question 14
30 seconds
Q. For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
• Question 15
30 seconds
Q. Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.
AlCl3
Cl2
Al
Gary Busey
• Question 16
30 seconds
Q. If you predicted that 1.5 moles of Magnessium are used in a reaction, and you have 2.0 moles of Magnessium, what type of reactant is Magnessium?
Limiting Reactant
Excess Reactant
Fast Reacter
Non-Reactant
• Question 17
30 seconds
Q. If you predicted that 1.5 moles of Magnesium are used in a reaction, and you have 1.0 mole of Magnesium, how much Magnesium is in Excess?
0.5 moles Mg
1.5 moles Mg
1.0 mole Mg
0.0 Moles Mg
• Question 18
60 seconds
Q. Carbon and Oxygen combine to form CO2. If 10g of Carbon combines with Oxygen to produce 20g of CO2 and 10g of Oxygen combines with Carbon to produce 15g of CO2, How many grams of CO2 are produced from 10g of Carbon and 10g of Oxygen?
20g of CO2
15g of CO2
17.5g of CO2
25g of CO2
• Question 19
30 seconds
Q. When does a chemical reaction stop?
When the lab is finished
When the excess reactant is used up
When the limiting reactant is used up
Chemical reactions never stop
• Question 20
30 seconds Q. The Formula to make S'mores is:
2C + 1M + G→ C2MG2. If you have 5 Marshmallows (M), 9 Chocolate Pieces (C), and 9 Graham Cracker Halves (G), how many S'mores can you make?