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Review Of Stoichiometry
Test Description: General questions on stochiometric concepts
Instructions: Answer all questions to get your test result.
1) The starting material in an equation is
A
theoretical yield
B
quantity
C
mole
D
reactant
2) The actual amount of product in a chemical reaction
A
theoretical yield
B
actual yield
C
percent yield
D
mole
3) The calculations of quantities in a chemical reaction
A
percent error
B
stoichiometry
C
actual yield
D
theorectical yield
4) The substance that is left over after a reaction takes place
A
reactant
B
limiting reagent
C
excess reagent
D
mole
5) The coefficients of a balbanced equation indicate relative number of
A
grams
B
elements
C
moles
D
atoms
6) The law of conservation of mass means reactants and products must have equal
A
# of molecules
B
masses
C
volumes
D
moles
7) When dealing with gases, the calculations are done at the conditions of
A
boiling point
B
vapor pressure
C
atmospheric pressure
D
STP
8) The molar mass of NaBr is
A
103 g
B
33 g
C
303 g
D
1030 g
9) How many moles of CO are needed to react with 6.5 moles of O2 in the following 2CO + O2 --2CO2
A
13 moles
B
17 moles
C
3.3 moles
D
6.5 moles
10) what is the percent yield in a reation that has an actual yield of 12 grams and a theoretical yield of 15 grams ?
A
80%
B
75%
C
20%
D
8 %
11) The reactant in an equation that runs out 1st is known as the
A
excess reactant
B
limiting reactant
C
base reactant
D
product
12) The number of liters in 1 mole of any gas at STP is
A
24.4
B
24.2
C
22.4
D
42.2
13) Standard temperature and pressure are
A
0K and 101.3 kPa
B
0 C and 1 kPa
C
0C and 101.3 kPa
D
0K and 1 atm
14) To calculate a stoichiometric problem that gives a mass and wants a mass, what must you use to do the conversions
A
molar mass of the reactants
B
coefficients
C
22.4
D
STP
*select an answer for all questions
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