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8th Chemical Reactions
Test Description: Review for Chemical Reactions Chapter 5
Instructions: Answer all questions to get your test result.
1) A change in matter that produces new substances is called a
A
physical change
B
chemical reaction
C
solution
D
mixture
2) which of the following cannot be used to put out a small fire?
A
Water
B
Baking Soda
C
Oxygen
D
Carbon Dioxide
3) A number that is written smaller and lower than the letter symbols in a chemical formula and that shows how many atoms of a substance are in a molecule is called
A
superscript
B
subscript
C
coefficient
D
element
4) The rate of reaction can be decreased by increasing
A
temperature
B
surface area
C
concentration of reactants
D
amount of inhibitor
5) In a balanced equation, both sides should have the same
A
number of atoms
B
number of coefficients
C
number of molecules
D
number of subscripts
6) If a reaction absorbs energy, it is called
A
an exothermic reaction
B
a decomposition reaction
C
an endothermic reaction
D
a replacement reaction
7) When two or more substances combine to form a complex compound this process is called
A
replacement reaction
B
synthesis reaction
C
physical change
D
a decomposition reaction
8) The number in front of a chemical formula that tells how many molecules or atoms of each reactant take part in a reaction is called
A
coefficient
B
concentration
C
symbol
D
subscript
9) Which of the following is not evidence of a chemical reaction
A
formation of ice crystals
B
change in color
C
production of gas
D
production of a new substance
10) In a chemical reaction, the sum of the masses of the products is equal to the sum of the
A
atoms in the equation
B
subscripts
C
masses of the reactants
D
coefficients
*select an answer for all questions
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