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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
mixture
B
physical change
C
solution
D
chemical reaction
2) which of the following cannot be used to put out a small fire?
A
Oxygen
B
Water
C
Carbon Dioxide
D
Baking Soda
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
element
B
coefficient
C
superscript
D
subscript
4) The rate of reaction can be decreased by increasing
A
amount of inhibitor
B
concentration of reactants
C
surface area
D
temperature
5) In a balanced equation, both sides should have the same
A
number of subscripts
B
number of molecules
C
number of atoms
D
number of coefficients
6) If a reaction absorbs energy, it is called
A
an exothermic reaction
B
an endothermic reaction
C
a replacement reaction
D
a decomposition reaction
7) When two or more substances combine to form a complex compound this process is called
A
a decomposition reaction
B
physical change
C
synthesis reaction
D
replacement 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
concentration
B
coefficient
C
subscript
D
symbol
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
subscripts
B
masses of the reactants
C
coefficients
D
atoms in the equation
*select an answer for all questions
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