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Chemical Reaction Review
Test Description: Review for the chemical reaction quiz.
Instructions: Answer all questions to get your test result.
1) In the formula H2SO4, how many atoms are there?
A
6
B
2
C
7
D
4
2) The number of each kind of atom in the reactants of a chemical reaction is
A
equal to the number of each kind of atom in the products.
B
equal to the number of some of kinds of atoms in the products.
C
greater than the number of each kind of atom in the products.
D
less than the number of each kind of atom in the products.
3) A reaction in which one element is substituted for another in a compound is called a(n)
A
replacement reaction.
B
synthesis reaction.
C
decomposition reaction.
D
exothermic reaction.
4) The minimum amount of energy required to start a chemical reaction is the
A
reactant energy.
B
endothermic energy.
C
exothermic energy.
D
activation energy.
5) A material that increases the rate of a chemical reaction by lowering the activation energy is called a(n)
A
inhibitor.
B
deactivator.
C
precipitate.
D
catalyst.
6) Which of the following is the best evidence for a chemical reaction?
A
change in temperature
B
formation of a new substance
C
change of state
D
gas bubbles
7) You can balance a chemical equation by changing the
A
reactants.
B
coefficients.
C
subscripts.
D
products.
8) A chemical reaction in which two elements combine to form a compound is called a
A
synthesis reaction.
B
decomposition reaction.
C
precipitation reaction.
D
replacement reaction.
9) The scientist found that 2 grams of hydrogen reacted completely with 16 grams of oxygen. What was the total mass of water produced?
A
18 grams
B
8 grams
C
32 grams
D
14 grams
10) Salt water is an example of
A
a homogeneous mixture.
B
an element.
C
a compound.
D
a heterogeneous mixture.
*select an answer for all questions
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