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