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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
a product
C
an enzyme
D
a reactant
2) In a balanced chemical reaction, the total mass of the products is always equal to the
A
molar mass of the reactants
B
atomic mass of the reactants
C
proportional masses of the reactants
D
total 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
imbalance
C
displacement
D
equilibrium
4) what happens in a chemical reaction
A
atoms are heated and cooled
B
atoms are rearranged
C
atoms are destroyed
D
atoms are created
5) an enzyme is a special kind of catalyst that works
A
maintain the correct temperature for the reaction
B
slow down a specific biochemical 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
exothermic
C
molecular
D
electrons
7) Radicals react quickly to form covalent bonds with nearby substances because then have _________ available for bonding
A
mass
B
elements
C
electrons
D
molecules
8) A compounds ____ formula tells you how many of each type of atoms are in one molecule
A
chemical
B
molar
C
molecular
D
empirical
9) In a chemical reaction the combined molar masses of the _____ equals the combined molar masses f the __________
A
reactants/product
B
endothermic/exothermic
C
elements/proportions
D
mass/volume
10) The law of definite proportions states that a compound always contains the same _____ in the samed
A
endothermic/exothermic
B
mass/volume
C
reactants/product
D
elements/proportions
*select an answer for all questions
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