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2nd Semester Exam Review
Test Description: 2nd semester Exam Review
Instructions: Answer all questions to get your test result.
1) The actual yield of a product is
A
independent of the reactants
B
the same as the theoretical yield
C
a negative value
D
measured experimentally
2) Percent yield of a product is a measure of a reaction's
A
rate
B
spontaneity
C
heat production
D
efficiency
3) In a reaction, substances A and B form substance C. If the actual mole ratio of substance B to substance A is less than the balanced equation mole ratio of substance B to substance A, substance B is
A
limiting reactant
B
product
C
excess reactant
D
actual yield
4) Limiting a reactant is often accomplished by
A
using an excess of another reactant
B
producing excess product
C
slowing down a chemical reaction
D
overcoming conservation of mass
5) Calculating the mass of a reactant and product from the number of moles of another product or reactant in a chemical equation is an example of a
A
mass-to-mass conversion
B
mole-to-mole conversion
C
mole-to-mass conversion
D
mass-to-mole conversion
6) In the decomposition reaction of compound AB into substances A and B, what is the number of mole ratios?
A
1
B
6
C
9
D
3
7) Mole ratios for a reaction are obtained from the
A
balanced chemical equation
B
total mass of products
C
periodic table
D
molar masses
8) In a balanced chemical equation, the numbers of individual particles and the numbers of moles of particles are represented by the
A
coefficients
B
chemical symbols
C
subscripts
D
molar masses
9) Stoichiometry is based on the law of conservation of
A
volume
B
charge
C
mass
D
reactants
10) The SI unit of molar mass is the
A
mole
B
gram
C
mole/gram
D
gram/mole
*select an answer for all questions
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