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WorksheetsEND OF MODULE 10 TEST
Total questions: 50
Worksheet time: 2hrs 37mins
How many particles are in 13.5 grams of Beryllium?
1.5 particles
9 particles
4x10^23 particles
9x10^23 particles
2 NaClO3 (s) --> 2NaCl (s) + 3 O2 (g)
12.00 moles of NaClO3 will produce how many grams of O2?
256 g of O2
576 g of O2
288 g O2
2CO + O2 → 2CO2
How many liters of carbon dioxide are produced from 10L of carbon monoxide?
10
20
1
5
In a lab, a scientist calculates 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?
82%
0.82%
10.1%
100%
When 12 moles of O2 react with 1.1 moles of C10H8, what is the limiting reactant? C10H8 + 12 O2 --> 10 CO2 + 4 H2O
Oxygen
C10H8
Water
Carbon Dioxide
4 Al + 3 O2 → 2 Al2O3. How much aluminum would be needed to completely react with 45 grams of O2?
1.05 moles
3.75 moles
1.875 grams
1.875 moles
What is the percent yield of the following reaction if 145g of P2O5 reacts with 40 grams of water, but you only collected 112 grams of phosphoric acid? 3 H2O + P2O5 -> 2H3PO4
80%
85%
77%
58%
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
How many liters of NH3 are needed to react completely with 30.0L of NO? 4NH3+6NO --> 5N2 + 6H2O
5.0 L
20.0 L
7.5 L
120.0 L
2H2 + O2 → 2H2O
How many moles of oxygen are consumed if 8 moles of H2 are used?
2
4
6
8
For the Balanced Reaction: 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe; What is the Ratio of moles of MgO to moles of Fe?
3mol Mg / 2 mol Fe
2 mol Mg/ 3 mol Fe
1 mol Fe/ 2 mol Fe
3 mol MgO / 2 mol Fe
How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?
2Na + 2H2O → 2NaOH + H2
How many grams of hydrogen are produced if 120 g of Na are available?
5.2 g
2.6 g
690 g
45 g
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
B2H6 + 3O2 --> 2 HBO2 + 2 H2O. What mass of O2 will be needed to burn 36.1 g of B2H6?
13.8 g O2
3.86 mol of O2
124 g O2
180.18 g/mol
180.12 g/mol
180.24 g/mol
180.06 g/mol
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles of H2?
4 moles Fe
6 moles Fe
9 moles Fe
2 moles Fe
N2 + 3H2 → 2NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
6 mol H
2 mol H
3 mol H
1 mol H
Balance the following reaction:
CaC2(s) + H2O(l) --> C2H2(g) + Ca(OH)2(aq)
1,2,2,2
1,2,1,1
2,1,1,1
2,1,2,1
CaC2(s) + 2H2O(l) --> C2H2(g) + Ca(OH)2(aq)
How many grams of Ca(OH)2 would be formed with 3.20 moles of CaC2?
119 g
21.2 g
114 g
237 g
According to the following balanced chemical equation, which molar ratio is consistent with the chemical equation based on the stoichiometric coefficients?
3 KOH + FeCl3 → Fe(OH)3 + 3 KCl
1 mol KOH : 1 mol Fe(OH)3
1 mol KOH : 1 mol KCl
3 mol FeCl3 : 1 mol KCl
1 mol FeCl3 : 3 mol Fe(OH)3
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction using the balanced chemical equation, he or she is calculating the theoretical yield.
theoretical yield
mole ratio
actual yield
percentage yield
SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
96 g
0.67 g
2.67 g
48 g
A chemist interested in the efficiency of a chemical reaction would calculate the percent yield.
mole ratio
rate of reaction
percent yield
energy released
How many particles are in 13.5 grams of Beryllium?
1.5 particles
9 particles
4x10^23 particles
9x10^23 particles
Balance the following reaction:
CaC₂(s) + H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)
1,2,2,2
1,2,1,1
2,1,1,1
2,1,2,1
PCl5 + ___ H2O → ___ HCl + H3PO4
4, 5
1, 6
3, 8
2,2
__ Al + __ FeO → Al2O3 + __ Fe
1, 1, 2
2,1,2
2, 3, 3
2,4,2
Balance this equation.
_SnO2 + _H2 --> _Sn + _H2O
1,1,2,1
1,2,1,1
1,2,1,2
1,2,2,1
Balance this equation.
CF4 + Br2 --> CBr4 + F2
2,1,2,1
1,2,2,1
1,2,1,2
2,2,2,2
What is the little number after an element in a chemical equation called? Example: H2
Coefficient
Subscript
Atom
Equation
Balance this equation: _Al + _HCl --> _H2 + _AlCl3
2, 6, 3, 2
it is already balanced
4, 12, 3, 4
2, 1, 4, 5
Balance this equation.
CH4 + O2 --> CO2 + H2O
1,2,1,1
2,1,2,1
1,2,1,2
0,2,0,2
Which equation is balanced?
PbO2 + 2H2 --> H2SO4
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
2Na + 2H2O --> 2NaOH + H
The substances at the beginning of a chemical equation are called the ____.
product
yield
chemical symbol
reactants
What is the right part of a chemical equation called? H2 + O2 --> H2O
Reactants
Products
Yields
Chemical Equation
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?
bread
jelly
peanut butter
sandwich
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
What is the limiting reactant if 10 moles of NH3 react with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
NH3
NO
N2
water
The excess reactant is the reactant that is left over.
is used up first
is the reactant that is left over
A reactant that remains after a chemical reaction stops.
stoichiometry
mole ratio
excess reactant
limiting reactant
Why is it important to identify the limiting reagent?
The limiting reagent speeds up the reaction.
The limiting reagent controls the amount of product formed.
If there is no limiting reagent, the reaction will not occur.
No stoichiometry calculations can be done without a limiting reagent.
