August 2009 Chemistry Regents #21-30
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21 According to the kinetic molecular theory,
which statement describes the particles in a
sample of an ideal gas?
(1) The force of attraction between the gas particles is strong.
(2) The motion of the gas particles is random and straight-line.
(3) The collisions between the gas particles cannot result in a transfer of energy between the particles.
(4) The separation between the gas particles is smaller than the size of the gas particles themselves.
|2||KMT-gas travel in straight line
molecules no volume
|22 The activation energy of a chemical reaction can
be decreased by the addition of
(1) a catalyst (3) electrical energy
(2) an indicator (4) thermal energy
|23 A straight-chain hydrocarbon that has only one
double bond in each molecule has the general
(1) CnH2n-6 (3) CnH2n
(2) CnH2n-2 (4) CnH2n+2
|3||alkene Table Q|
|24 Why can an increase in temperature lead to more
effective collisions between reactant particles
and an increase in the rate of a chemical reaction?
(1) The activation energy of the reaction increases.
(2) The activation energy of the reaction decreases.
(3) The number of molecules with sufficient energy to react increases.
(4) The number of molecules with sufficient energy to react decreases.
|3||reaction = effective collisions
temperature =>molecules avg. kinetic energy
|25 Which reaction results in the production of
(1) esterification (3) polymerization
(2) fermentation (4) saponification
|4||saponification makes soap fat (ester) + base==> soap and glycerol|
|26 Which substance is always a product when an
Arrhenius acid in an aqueous solution reacts
with an Arrhenius base in an aqueous solution?
(1) HBr (3) KBr
(2) H2O (4) KOH
|2||neutralization is water|
|27 Which substance is an electrolyte?
(1) CCl4 (3) HCl
(2) C2H6 (4) H2O
|3||acid base or salt
HCl is an acid
|28 One acid-base theory defines a base as an
(1) H+ donor (3) H donor
(2) H+ acceptor (4) H acceptor
|2||acid H+ donor
base H+ acceptor
|29 A change in the nucleus of an atom that converts
the atom from one element to another element
(1) combustion (3) polymerization
(2) neutralization (4) transmutation
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