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Ch 9, 8th Grade
Test Description: Chemical Reactions
Instructions: Answer all questions to get your test result.
1) Chemical changes do NOT result in a new substance being formed.
A
true
B
false
2) Which is a sign that a chemical reaction is taking place?
A
fizzing/bubbling
B
a change in color
C
all of the above
D
the release of light and sound
3) How do you know for sure that a chemical reaction is taking place?
A
all of the above
B
the presence of bubbles
C
studying the substance before and after the reaction
D
a change in temperature
4) What happens in a chemical reaction?
A
all of the above
B
atoms rearrange and form new substances
C
a substance changes physical properties only
D
substances retain all their original properties
5) The substances to the left of the arrow in a chemical equation are called the
A
subscripts
B
reactants
C
coefficients
D
products
6) The total mass before a chemical reaction is the same after a chemical reaction. This is the law of
A
conservation of reactants
B
conservation of mass
C
conservation of energy
D
conservation of temperature
7) Whose research contributed to the law of conservation of mass?
A
Antoine Lavoisier
B
Henri Becquerel
C
Anton von Leeuwenhoek
D
Marie and Pierre Curie
8) A number placed in front of an element symbol or chemical formula is called a
A
product
B
subscript
C
coefficient
D
reactant
9) A reaction in which two or more substances combine and form one compound is called a
A
synthesis
B
single replacement
C
decomposition
D
double replacement
10) A reaction in which a single reactant breaks down into two or more products is called a
A
double replacement
B
decomposition
C
combustion
D
single replacement
11) Negative ions in 2 compounds switch places in which kind of reaction?
A
synthesis
B
single replacement
C
double replacement
D
combustion
12) What happens to energy when a chemical bond is broken?
A
it is absorbed
B
it is released
C
it is created
D
it is destroyed
13) In an exothermic reaction, energy is...
A
absorbed
B
released
C
destroyed
D
created
14) The minimum amount of energy needed to start a chemical reaction is called
A
starting energy
B
reaction energy
C
beginning energy
D
activation energy
15) We can make a chemical reaction occur faster if we
A
increase the surface area
B
all of the above
C
increase the temperature
D
increase the concentration
16) When a catalyst is added to a reaction, it is considered a reactant.
A
True
B
False
17) A catalyst that speeds up chemical reactions in living cells is called a(n)
A
preservative
B
inhibitor
C
hormone
D
enzyme
18) A preservative is an example of a(n)
A
protein
B
inhibitor
C
enzyme
D
catalyst
19) A description of a reaction using element symbols and chemical formulas is called a
A
chemical equation
B
chemical symbol
C
chemical formula
D
chemical reaction
20) A reaction that absorbs energy is called
A
exothermic
B
thermal
C
endothermic
D
absorbothermic
*select an answer for all questions
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