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Chapter 3 Quiz
Test Description: 8th Grade Science
Instructions: Answer all questions to get your test result.
1) A reaction in which energy is released is a(n)
A
photosynthetic reaction
B
endothermic reaction
C
exothermic reaction
D
physical reaction
2) Plants absorb and store some of the energy in sunlight through a series of reactions called
A
photosynthesis
B
decomposition
C
fossil fuel formation
D
fossil fuel combustion
3) When a chemical bond is broken,
A
energy is released.
B
energy is either released or absorbed.
C
energy is absorbed.
D
no energy is released or absorbed.
4) Endothermic reactions always
A
release energy.
B
are part of photosythesis.
C
absorb energy.
D
have no change in energy.
5) Which is not evidence of chemical reactions?
A
precipitate
B
color change
C
gas
D
water
6) The splitting of water molecules into hydrogen and oxygen molecules is an example of
A
chemical change.
B
combination reaction.
C
physical change.
D
synthesis reaction.
7) Combustion reactions
A
require oxygen.
B
destroy atoms.
C
require glucose
D
form precipitate.
8) Which of the following will increase the rate of a reaction?
A
removing a catalyst
B
breaking the reactants into smaller pieces
C
decreasing the concentration
D
decreasing the temperature
9) What does a catalyst do in a chemical reaction?
A
It slows the reaction down.
B
It speeds the reactant up.
C
It is a reactant.
D
It becomes a product.
10) A chemical equation must
A
be balanced.
B
use coefficients.
C
use subscripts.
D
show energy.
*select an answer for all questions
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