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Ch 4, 8th Grade
Test Description: Chemical reactions
Instructions: Answer all questions to get your test result.
1) A ___ increases the reaction rate by lowering the activation energy needed.
A
catalyst
B
carbohydrate
C
protein
D
inhibitor
2) Activation energy is used to
A
to confuse students.
B
make things cooler
C
make things warmer
D
break the chemical bonds of the reactants
3) When one element replaces another element in a compound, that is a ___ reaction
A
synthesis
B
over
C
replacement
D
decomposition
4) Who first demonstrated the principle of the law of conservation of mass?
A
Anton van Leeuenhoek
B
Antoine Lavoisier
C
Charles Darwin
D
Gregor Mendel
5) What is on the right of a chemical equation?
A
products
B
arrow
C
reactants
D
yields
6) A characteristic of a substance that describes its ability to change into other substances.
A
physical property
B
mechanical property
C
chemical property
D
individual property
7) An example of chemical property is
A
shape
B
flammability
C
color
D
texture
8) A change in state is classified as a
A
physical change
B
chemical change
9) In a chemical change, the existing bonds break and never reform.
A
true
B
false
10) A solid that forms from liquids during a chemical reaction.
A
precipitation
B
rain
C
precipitate
D
gross
11) An endothermic reaction...
A
absorbs energy from its surroundings
B
doesn't need activation energy
C
puts energy into its environment
D
doesnt change energy
12) We separate reactants in a chemical equation with a
A
minus sign
B
equals to
C
arrow
D
plus sign
13) Activation energy is the ___ amount of energy needed to start a reaction.
A
just right
B
maximum
C
minimum
14) Warming up reactants can help ___ a reaction
A
stop
B
speed up
C
keep it the same way
D
slow down
15) Biological catalysts that help reactions occur at body temperature are called
A
enzymes
B
inhibitors
C
catalysts
16) The preservatives in food slow down spoilage. This is an example of
A
catalysts
B
prohibitors
C
inhibitors
*select an answer for all questions
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