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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
carbohydrate
B
inhibitor
C
catalyst
D
protein
2) Activation energy is used to
A
make things cooler
B
make things warmer
C
to confuse students.
D
break the chemical bonds of the reactants
3) When one element replaces another element in a compound, that is a ___ reaction
A
decomposition
B
over
C
replacement
D
synthesis
4) Who first demonstrated the principle of the law of conservation of mass?
A
Charles Darwin
B
Anton van Leeuenhoek
C
Antoine Lavoisier
D
Gregor Mendel
5) What is on the right of a chemical equation?
A
yields
B
products
C
reactants
D
arrow
6) A characteristic of a substance that describes its ability to change into other substances.
A
chemical property
B
individual property
C
physical property
D
mechanical property
7) An example of chemical property is
A
texture
B
color
C
shape
D
flammability
8) A change in state is classified as a
A
chemical change
B
physical 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
rain
B
precipitation
C
precipitate
D
gross
11) An endothermic reaction...
A
absorbs energy from its surroundings
B
puts energy into its environment
C
doesnt change energy
D
doesn't need activation energy
12) We separate reactants in a chemical equation with a
A
plus sign
B
equals to
C
arrow
D
minus sign
13) Activation energy is the ___ amount of energy needed to start a reaction.
A
maximum
B
minimum
C
just right
14) Warming up reactants can help ___ a reaction
A
speed up
B
stop
C
slow down
D
keep it the same way
15) Biological catalysts that help reactions occur at body temperature are called
A
catalysts
B
inhibitors
C
enzymes
16) The preservatives in food slow down spoilage. This is an example of
A
prohibitors
B
inhibitors
C
catalysts
*select an answer for all questions
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