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Ch 7 Chemical Rxn
Test Description: C
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 product
D
a reactant
2) In a balanced chemical reaction, the total mass of the products is always equal to the
A
total mass of the reactants
B
molar mass of the reactants
C
proportional masses of the reactants
D
atomic mass of the reactants
3) When a chemical reaction and its reverse are occurring at the same time and at the same rate, the reaction has achieved
A
decomposition
B
displacement
C
equilibrium
D
imbalance
4) what happens in a chemical reaction
A
atoms are created
B
atoms are heated and cooled
C
atoms are destroyed
D
atoms are rearranged
5) an enzyme is a special kind of catalyst that works
A
slow down a specific biochemical reaction
B
maintain the correct temperature for the reaction
C
speed up a specific biochemical reaction
D
break down chemical elements
6) photosynthesis is an example of an(n) ____ chemical reaction in which plants use sunlight to make glucose and oxygen
A
endothermic
B
electrons
C
molecular
D
exothermic
7) Radicals react quickly to form covalent bonds with nearby substances because then have _________ available for bonding
A
electrons
B
mass
C
elements
D
molecules
8) A compounds ____ formula tells you how many of each type of atoms are in one molecule
A
molecular
B
molar
C
empirical
D
chemical
9) In a chemical reaction the combined molar masses of the _____ equals the combined molar masses f the __________
A
elements/proportions
B
mass/volume
C
reactants/product
D
endothermic/exothermic
10) The law of definite proportions states that a compound always contains the same _____ in the samed
A
mass/volume
B
reactants/product
C
endothermic/exothermic
D
elements/proportions
*select an answer for all questions
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