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Review For Chapter 6 Test
Test Description: Review questions for chapter 6 on chemical reactions
Instructions: Answer all questions to get your test result.
1) What happens in a chemical reaction?
A
atoms are created
B
atoms are heated and cooled
C
atoms are destroyed
D
atoms are rearranged
2) Which statement about endothermic reactions is correct?
A
energy is used to force electrons to move to higher energy levels
B
energy is transferred from the surrondings to the reactants
C
energy is always created in the form of heat
D
energy is transferred from the reactants to the surrondings
3) Most of the energy in an isoocotane reaction is released in the form of
A
electical energy
B
water
C
sound
D
heat and light
4) Which of the following is an example of a decomposition reaction?
A
digestion
B
respiration
C
photosynthesis
D
exchange of ions between two compounds
5) When water is broken down by electrolysis, the products are
A
water and carbon dioxide
B
hydrogen and oxygen ions
C
oxygen and methane
D
hydrogen gas and oxygen gas
6) A balanced chemical equation shows the proportions of reactants and products necessary for
A
the reaction to occur
B
mass to be conserved
C
electrolysis to occur
D
enery use to be minimized
7) What could you do to make yeast dough rise more slowly?
A
knead the dough more vigorously
B
reduce the temperature
C
add mold spores to the dough
D
add more yeast to the mixture
8) An enzyme is a special kind of catalyst that works to
A
speed up a specific biochemical reaction
B
slow down a chemical reaction
C
break down chemical elements
D
maintain the correct temperature for a reaction
9) What is the relationship between chemical equilibrium and the rates of forward and reverse reaction?
A
in equilibrium, the forward reaction rate must be greater than the reverse reaction rate
B
in equilibrium, both forward and reverse reactions must stop
C
in equilibrium, the forward and reverse reaction rates must be equal
D
in equilibrium, the forward reaction rate must be less than the reverse reation rate
10) Increasing the concentration of one substance in an equilibrium reaction favors the reaction that
A
produces less of the substance
B
releases energy as heat
C
produces more of the substance
D
absorbs energy as heat
*select an answer for all questions
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