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Chapter 6 Qs For Final Review
Test Description: Ch 6 Qs
Instructions: Answer all questions to get your test result.
1) Which of the following is an example of a decomposition reaction?
A
digestion
B
exchange of ions between two compounds
C
polymerization
D
photosynthesis
2) Which statement about endothermic reactions is true?
A
energy is always created in the form of heat
B
energy is used to force electrons to move to higher energy levels
C
energy is transferred from the reactants to the surroundings
D
energy is transferred from surroundings to the reactants
3) A balanced chemical equation shows proportions of reactants and products necessary for
A
mass to be conserved.
B
the reaction to occur.
C
energy to be minimized.
D
electrolysis to occur.
4) A synthesis reaction is a reaction between at least two compounds in which...
A
a compound burns in the presence of oxygen.
B
a compound is decomposed by an electric current.
C
one breaks down into at least two products.
D
a new. more complex compound is formed.
5) A chemical equation is balanced by changing or adding...
A
powers.
B
subscripts.
C
reactants.
D
coefficients.
6) In an exothermic reaction, energy is transferred from
A
one reactant to another.
B
the surroundings to the reactants.
C
the container to the chemicals.
D
the reactants to the surroundings.
7) An enzyme is a special kind of catalyst that works to...
A
speed up a specific biochemical reaction.
B
slow down a chemical reaction.
C
break down chemical elements.
D
maintain the correct temperature for a reaction.
8) In a balanced chemical reaction, the total mass of the products always equals the...
A
proportional masses of the reactants.
B
total mass of the reactants.
C
molar mass of the reactants.
D
atomic mass of the reactants.
9) A reaction in which a single compound breaks down to form 2 or more simpler substances is called _____________________________.
A
single-displacement
B
synthesis
C
decomposition
D
double-displacemet
10) A substance that forms in a chemical reaction is called....
A
a reactant.
B
a product.
C
a chemical bond.
D
an ion.
11) A reaction in which two or more substances combine to form a new compound is called...
A
combustion.
B
electrolysis.
C
synthesis.
D
decomposition.
12) A reaction in which heat is released to the surroundings is called...
A
exothermic.
B
combustion.
C
decomposition.
D
endothermic.
13) The oxidation reaction of an organic compound in which heat is released is called...
A
synthesis.
B
decomposition.
C
combustion.
D
exothermic.
14) A ________________ is a substance that changes the rate of a reaction without being consumed or changed significantly.
A
radical
B
substrate
C
enzyme
D
catalyst
15) _____________________ is the relative number of moles of the substances required to produce a given amount of product in a reaction.
A
Molar mass
B
Moles
C
Mole ratio
D
Molecular formula
16) The process by which an electric current is used to produce a chemical reaction, such as the decomposition of water is called...
A
combustion.
B
synthesis.
C
electrolysis.
D
decomposition.
17) An organic group that has one or more electrons available for bonding is called...
A
a substrate.
B
a radical.
C
an enzyme.
D
a catalyst.
18) A substance or molecule that participates in a chemical reaction is called...
A
a substrate.
B
a catalyst.
C
a product.
D
a reactant.
19) A __________________ is a chemical reaction that requires heat.
A
endothermic reaction
B
oxidation reduction reaction
C
combustion reaction
D
exothermic reaction
20) ___________________ is the energy released when a chemical compound reacts to produce new compounds.
A
Exothermic energy
B
Chemical energy
C
Chemical bond
D
Chemical formula
*select an answer for all questions
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