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