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Which best explains why C. More molecules in the sawdust can collide with
sawdust burns more oxygen molecules.
quickly than a block of
wood of equal mass
under the same
conditions?
A. The molecules move
more quickly in the
sawdust than in the block
of wood.
B. The pressure of
oxygen is greater on the
sawdust.
C. More molecules in the
sawdust can collide with
oxygen molecules.
D. Oxygen is more
concentrated near the
sawdust than the block of
wood.
,Which applies to the A. Particles need to collide in order to react.
collision theory?
A. Particles need to
collide in order to react.
B. Particles may obtain
successful collisions in
any molecular
orientation.
C. Temperature increase
causes kinetic energy of
particles to decrease.
D. Reactions do not have
to begin with collision of
molecules or particles.
,A solid reactant is placed B. Fewer bubbles will be produced because of
into a beaker of a warm fewer collisions of reactant molecules.
water. The liquid
vigorously bubbles as the
solid dissolves into the
solution. What will most
likely happen if the
temperature of the liquid
is slightly reduced?
A. More bubbles will be
produced because the
solution is becoming
more concentrated.
B. Fewer bubbles will be
produced because of
fewer collisions of
reactant molecules.
C. The solid will get
smaller at a faster rate
because of more
collisions of reactant
molecules.
D. The solid will get
larger at a slower rate
because precipitate is
coming out of the
solution.
, Ben observes how A. reaction rate
quickly some dry wood is
burning in a campfire.
Which term best relates
to Ben's observation?
A. reaction rate
B. activation energy
c. collision theory
D. spontaneous reaction
An increase in b. increasing the number of molecules that have
temperature affects the sufficient kinetic energy to react.
reaction rate by?
a. decreasing the
velocities of particles that
collide in the reaction.
b. increasing the number
of molecules that have
sufficient kinetic energy
to react.
C. increasing the number
of molecules that have
sufficient potential
energy to react.
D. decreasing the energy
that particles need to
overcome the energy
activation barrier.