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Review For Chapter 6 Test
Test Description: Review question for chapter 6 test chemical reactions
Instructions: Answer all questions to get your test result.
1) A substance that undergoes a change in a chemical reaction is
A
an enzyme
B
a product
C
a reactant
D
a chemical
2) In an exothermic reaction, energy is transferred from
A
the surrondings to the reactants
B
one reactant to another
C
the container to the chemicals
D
the reactas to the surrondings
3) The energy source in photosynthesis is
A
heat energy
B
light energy
C
chemical energy
D
kinetic energy
4) A synthesis reaction is a reaction between at least two compounds in which
A
a new, more complex compound is formed
B
a compound is decomposed by an electric current
C
one breaks down into at least two products
D
a compound burns in the presence of oxygen
5) The product of the synthesis reaction between sodium and chlorine gas is
A
polyethylene
B
sodium chloride
C
copper (II) chloride
D
carbon dioxide
6) A chemical equation is balanced by changing or adding
A
chemical symbols
B
subscripts
C
coefficients
D
reactants
7) In a balanced chemical reaction, the total mass of the products always equals the
A
proportional masses of the reactants
B
molar mass of the reactants
C
total mass of the reactants
D
atomic mass of the reactants
8) Large, bulky molecules react more slowly than small ones because they have less opportunity to
A
become heated
B
be mixed with catalysts
C
collide with other molecules
D
increase their surface area
9) When a chemical reaction and its reverse are occuring at the same time and at the same rate, the reaction has achieved
A
decomposition
B
displacement
C
equilibrium
D
imbalance
10) Le Chatelier's principle states that increasing temperature favors a reaction that
A
absorbs energy as heat
B
releases energy as heat
C
involves a chemical catalyst
D
involves an enzyme
*select an answer for all questions
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