Ch 4, 8th Grade Question Preview (ID: 60421)
Chemical Reactions.
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A solid that forms from liquids during a chemical reaction.
a) precipitate
b) precipitation
c) rain
d) gross
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
We separate reactants in a chemical equation with a
a) plus sign
b) minus sign
c) arrow
d) equals to
An example of chemical property is
a) flammability
b) texture
c) color
d) shape
A change in state is classified as a
a) physical change
b) chemical change
c)
d)
In a chemical change, the existing bonds break and never reform.
a) false
b) true
c)
d)
A characteristic of a substance that describes its ability to change into other substances.
a) chemical property
b) physical property
c) mechanical property
d) individual property
When one element replaces another element in a compound, that is a ___ reaction
a) replacement
b) synthesis
c) decomposition
d) over
Who first demonstrated the principle of the law of conservation of mass?
a) Antoine Lavoisier
b) Charles Darwin
c) Anton van Leeuenhoek
d) Gregor Mendel
What is on the right of a chemical equation?
a) products
b) arrow
c) yields
d) reactants
A ___ increases the reaction rate by lowering the activation energy needed.
a) catalyst
b) protein
c) inhibitor
d) carbohydrate
Activation energy is used to
a) break the chemical bonds of the reactants
b) make things warmer
c) make things cooler
d) to confuse students.
Activation energy is the ___ amount of energy needed to start a reaction.
a) minimum
b) maximum
c) just right
d)
Warming up reactants can help ___ a reaction
a) speed up
b) slow down
c) keep it the same way
d) stop
Biological catalysts that help reactions occur at body temperature are called
a) enzymes
b) catalysts
c) inhibitors
d)
The preservatives in food slow down spoilage. This is an example of
a) inhibitors
b) prohibitors
c) catalysts
d)
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