Ch 7 Chemical Rxn: Question Preview (ID: 5069)

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A substance that undergoes a change in a chemical reaction is
a) a product
b) a chemical
c) a reactant
d) an enzyme

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) total mass of the reactants
d) proportional masses of the reactants

When a chemical reaction and its reverse are occurring at the same time and at the same rate, the reaction has achieved
a) displacement
b) equilibrium
c) imbalance
d) decomposition

what happens in a chemical reaction
a) atoms are destroyed
b) atoms are created
c) atoms are heated and cooled
d) atoms are rearranged

an enzyme is a special kind of catalyst that works
a) speed up a specific biochemical reaction
b) slow down a specific biochemical reaction
c) break down chemical elements
d) maintain the correct temperature for the reaction

photosynthesis is an example of an(n) ____ chemical reaction in which plants use sunlight to make glucose and oxygen
a) molecular
b) endothermic
c) electrons
d) exothermic

Radicals react quickly to form covalent bonds with nearby substances because then have _________ available for bonding
a) molecules
b) electrons
c) elements
d) mass

A compounds ____ formula tells you how many of each type of atoms are in one molecule
a) molecular
b) chemical
c) empirical
d) molar

In a chemical reaction the combined molar masses of the _____ equals the combined molar masses f the __________
a) elements/proportions
b) reactants/product
c) mass/volume
d) endothermic/exothermic

The law of definite proportions states that a compound always contains the same _____ in the samed
a) endothermic/exothermic
b) elements/proportions
c) reactants/product
d) mass/volume

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