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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
physical reaction
B
photosynthetic reaction
C
exothermic reaction
D
endothermic reaction
2) Plants absorb and store some of the energy in sunlight through a series of reactions called
A
fossil fuel combustion
B
decomposition
C
photosynthesis
D
fossil fuel formation
3) When a chemical bond is broken,
A
no energy is released or absorbed.
B
energy is either released or absorbed.
C
energy is released.
D
energy is 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
color change
B
gas
C
water
D
precipitate
6) The splitting of water molecules into hydrogen and oxygen molecules is an example of
A
combination reaction.
B
synthesis reaction.
C
chemical change.
D
physical change.
7) Combustion reactions
A
destroy atoms.
B
require oxygen.
C
form precipitate.
D
require glucose
8) Which of the following will increase the rate of a reaction?
A
decreasing the temperature
B
removing a catalyst
C
decreasing the concentration
D
breaking the reactants into smaller pieces
9) What does a catalyst do in a chemical reaction?
A
It slows the reaction down.
B
It speeds the reactant up.
C
It becomes a product.
D
It is a reactant.
10) A chemical equation must
A
use subscripts.
B
be balanced.
C
use coefficients.
D
show energy.
*select an answer for all questions
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