R Chem
KineticsThermo Rev MC
1. After being ignited in a Bunsen burner
flame, a piece of magnesium ribbon
burns brightly, giving off heat and light.
In this situation, the Bunsen burner
flame provides
(1)ionization energy
(Z)activation energy
(3)heat of reaction
(4) heat of vapori zation
2. Two reactant particles collide
with
proper orientation.'The collision will be
effective if the particles have
(1 )high activation energy
(2)high ionization energy
(3) sufficient kinetic energy
(4) sufficient potential energy
a
J.
Which event must always occur for a
chemical reaction to take place?
(l)formation of a precipitate
(2)formation of a gas
(3 ) effective collisions between reacting
particles
(4)addition of a catalyst to the reaction
system
4.
In most aqueous reactions
as
temperature increases, the effectiveness
of collisions between reacting particles
(1)decreases
(3)remains the same
(2)increases
5.
Which conditions will increase the rate
of a chemical reaction?
decreased temperature and decreased
concentration of reactants
(2) decreased temperature and increased
concentralion of reactants
(3) increased temperature and decreased
concentration of reactants
(4) increased temperature and increased
concentration of reactants
(1)
6. As the temperafure increases, the rate
an exothermic reaction
(1)decreases
(2)increases
of
(3)remains the same
7. In each of the four beakers shovm below,
reacts
a 2.O-centimeter strip of magnesium ribbon
with 100 milliliters of HCI(aq) under the conditions shown.
0.1 M HCt
200c
1.0 M HCt
200c
BeakerA
Beaker
B
0.1 M HCt
50.c
Beaker
1.0 M HCt
50"c
C
Beaker D
In which beaker will the reaction occur at the fastest rate?
(1) A
8.
(2) B
Given the reaction:
Ar(d + Br(d s
2 AB(g) + heat
An increase in the concentration of
lr(g) will
(l)decrease the production oflB(g)
(2)decrease the frequency of collisions
between Ar(g) and Br(g)
(3)increase the production of Br(g)
(4)increase the frequency of collisions
between Ar(g and Br(g)
(3) c
(4)
D
9. Giiven the reaction:
I 1. Given the reaction:
+B+AB
The table below shows student data
obtained about the rate of reaction when
the concentration of solution,4 is kept
constant and the concentration of
solution ^B is changed by adding HrO.
Based on the data, the student should
conclude that the
Volume ol
Solutlon .4
Volume of
Solution B
HrQ Added
Reactlon
Tlme
1
10 mL
10 mL
0mL
2.8 sec
2
10 mL
5mL
5mL
4.9 sec
3
10 mL
3mL
7mL
10.4 sec
Trlal
Volume of
Fe(s) + 2 HCI(ad _+ FeCtr(aq) +
Hr(g)
In this reaction, 5 grams of powdered
iron will react faster than a l-gram piece
of solid iron because the powdered iron
(l)has less surface rrea
(2)has more surface area
(3)is less dense
(a)is more dense
12. Compared to the rate of inorganic
reactions, the rate of organic reactions
generally is
(l)slower because organic particles
(l)concentration has no effect on the
reaction rate
(Z)reaction rate increased when HrO
was added
(3)reaction rate increased as solution B
was diluted
(4)reaction rate decreased as solution -B
was diluted
10.
At STP, which 4.0-gram zinc sample
will react fastest with dilute
hydrochloric acid?
(1)lump
(3)powdered
(2)bar
(4)sheet metal
are
ions
(2) slower because organic particles
contain covalent bonds
(3)faster because organic particles are
ions
(4) faster because organic particles
contain covalent bonds
13. Which will occur if a catalyst is added
to a reaction mixture?
(1)The activation energy will be
changed.
(2)Only the rate of the forward reaction
will be increased.
(3)Only the rate of the reverse reaction
will be increased.
(a) The energy change (M4 of the
reaction will be decreased.
14, Given the balanced equation
16, A catalyst works by
representing a reaction:
(l)increasing the potential energy of the
reactants
CHo(g) + Z0r(e) -+ ZHrO(g) + CO2
(g) + heat
(2)increasing the energy released during
a reaction
(3)decreasing the potential energy of the
products
(4) decreasing the activation energy
required for a reaction
Which statement is true about energy in
this reaction?
(l)The reaction is exothermic because it
releases heat.
(2)The reaction is exothermic because it t7. Which change is exothermic?
absorbs heat.
(1)freezing of water
(3)The reaction is endothermic because
(2)melting of iron
it releases heat.
( 3 vapor ization o f ethano I
)
(a)The reaction is endothermic because
(4) sublimation of iodine
it absorbs heat.
15.
Based on the nature of the reactants in
each of the equations below, which
reaction atZloC will occur at the fastest
rate?
(1)C(s)+o'(e)+Cor(g)
+ CaO(s) + COr(g)
as ?n
(l)endothermic chemical change
(2) endothermic physical change
(3) exothermic chemical change
19. Given the equation:
I+I-eIr+35kcal
t)+
o(e)
(a)CaCO,(s)
The burning of wood is best described
(4) exothermic physical change
(2)NaOH(aq) + HCI(aq) -+
NaCl(aq) + HzO(
t)
(3)CH3OH(/) + CH3COOH(
CH3COOCHT(aq)
18.
* H,
This equation shows that the formation
of an iodine molecule is an
(1)exothermic process in which energy
is absorbed
(2)exothermic process in which energy
is released
(3)endothermic process in which energy
is absorbed
(4)endothermic process in which energy
is released
20. When an exothermic reaction occurs in
a water solution, the temperature of the
solution
(l)increases because energy is given off
by the reaction
(2)increases because energy is absorbed
by the reaction
(3)decreases because energy is given off
by the reaction
(4)decreases because energy is absorbed
by the reaction
21. Base your answer to the following
question on the table below shows the
data collected during the heating of a
5.0 gram sample of a hydrated salt.
Mass of
salt (s)
Heating Time
(min) .
In a rechargeable battery system, the
discharging reaction is
(1)exothermic and the charging reaction
is exothermic
(2)exothermic and the charging reaction
is endothermic
(3)endothermic and the charging
reaction is exothermic
(4)endothermic and the charging
reaction is endothermic
According to Table I, which compound
has a higher potential energy than the
elements from which it is formed?
(l)aluminum oxide (s)
(2)hydrogen oxide (c)
(3)carbon dioxide (g)
(4)nitrogen (II)
oxide (g)
Which expression represents the A/1for
a chemical reaction in terms of the
potential energy, PE, of its products and
reactants?
(I)PE of products + PE of reactants
After 60. minutes, how many grams of
water appear to remain in the salt?
(1)0.00
(3) 1.e
(2)2.0
(4)0.e0
(2)PE of products - PE of reactants
(3)PE of products x PE of reactants
(4)PE of products + PE of reactants
According to Table I, which salt
releases energy as it dissolves?
(r)KNO3
(3)NH4NO3
(2)LiBr
(a)NaCl
26.
For the reaction
A+B->C*heat,
the potential energy of the products,
compared to the potential energy of the
reactants, is
(l)less and the reaction is exothermic
28. In a reversible reaction, the difference
between the activation energy of the
forward reaction and the activation
energy of the reverse reaction is equal to
the
activation connplex
(2)heat of reaction
(3)potential energy of reactants
(4)potential energy of products
(
1
)
(2)less and the reaction is endothermic
(3)greater and the reaction is exothermic
(4)greater and the reaction is
29. According to Reference Table I, when 2
endothermic
moles of HrO(g) are formed from its
elements,
27. According to Reference Table I, the
decomposition of which compound is
exothermic?
(1)ethane
(2)nitrogen (II) oxide
(3)carbon dioxide
(4)ammonia
(l)484 kJ of heat is absorbed
(2)484 kJ of heat is released
(3)242 kJ of heat is absorbed
(4)242 kJ of heat is released
30. According to Reference Table I, the
dissolving of NHoCI(s) in water is
(1)exothermic and the heat of reaction is
negative
(2)exothermic and the heat of reaction is
positive
(3)endothermic and the heat of reaction
is negative
(4)endothermic and the heat of reaction
is positive
31. A potential energy diagram is shown below.
Reaction Coordinate
Which letters represent the activation energy of the forward and reverse reactions,
respectively?
(1) A and C
(2) A and D
32. Given the potential energy diagram for a
reaction:
ctr
0,
UJ
t!
'i;
tr
o
o
o.
Reaetion Coordinate
Which interval on this diagram
represents the difference between the
potential energy of the products and the
potential energy of the reactants?
(1) 1
(3)3
(2)2
(4)4
(3) B and C
(4) B and D
33. Given the potential
energy diagram for a
chemical reaction:
g
f
40.
Pin
o
tr
UJ
E
tr
E
2a'
I
34. The diagram below represents the
energy changes that occur during the
formation of a certain compound under
standard conditions.
\
\
\
CD
o
g
ut
\
\
AH
E
\
o
o
(L
10.
o-
Reaction Coordinate
Reaction Coordinate
Which statement correctly describes the
energy changes that occur in the
forward reaction?
(l)The activation energy is 10. kJ and
the reaction is endothermic.
(2)The activation energy is 10. kJ and
the reaction is exothermic.
(3)The activation energy is 50. kJ and
the reaction is endothermic.
(a)The activation energy is 50. kJ and
the reaction is exothermic.
According to Reference Table I, the
compound could be
(l)CrHu(g) (3)HI(g)
(a)NH,(g)
(2)Cor(g)
35, When a spark is applied to a mixture of 35.
hydrogen and oxygen, the gases react
explosively. Which potential energy
diagram best represents the reaction?
(1) at
d)l
cl
[rJl
_t
.ql
cl
a'l
ol
(L
The graph below represents a chemical
reaction.
g,
o
g
o
E
cc)
o
o.
ol
'6
CS
(t)
o
(2)
.r
\ / ctll
(l)l
cl
r.rJ I
_t
.ql
cl
4Jl
ol
(L'
AL
Fleaction
Coordinate
Reaction coordinate
This reaction is best described as
(1)endothermic, because energy is
absorbed
(2)endothermic, because energy is
(3) at
ol
trl
LrJ
_t
.sl
cl
ol
ol
&'
I
released
(3)exothermic, because energy is
absorbed
(4)exothermic, because energy is
released
(4)
\ /
-r
cttl
ol
EI
lri
_t
.sl
cl
ol
ot
(L
I
37. In the potential energy diagram below,
which letter represents the potential
energy of the activated complex?
(9
a
TU
z,
ut
J
{
l-
z,
ul
F
c)
o-
REACTION COORDINATE
(r)A
(3)c
(2)B
(4)D