Transcript AP Chemistry MC - Rancho High School

Chemistry MC
For the reaction
2A + 3B + C = Products,
the rate equation is:
a) R = k[A][B][C]
b) R = k[A]2[B]3[C]
c) R = k[B]3[C]
d) Insufficient information to fix rate
equation
Consider 2A + 3B = D
When Designing The Experiment If You
Would Like To Determine The Rate Order
With Respect To A You Notice That When
You Double The Concentration The Rate
Doesn’t Change. What Can You Conclude
From That
a) It Is Zero Order For A
b) It Is First Order For A
c) It Is Second Order For A
d) A Doesn’t Have Impact So It Is Not Part
Of The Rate Law
1. Which graph
represents a plot of
average rate on
the vertical axis
versus the average
concentration of A
squared on the
horizontal axis for a
second order
reaction.
2. Which graph represents a plot of the
natural logarithm of the concentration
of A on the vertical axis versus the time
on the horizontal axis for a first order
reaction
The following reaction is found to be
first order in H2 (g) and second order
in NO (g). The rate law for this
reaction is:
2NO (g) + 2H2 = N2 (g) + 2H2O (g)
A)Rate = k[NO]2[H2]2/[N2][H2O]2
B) Rate = k[NO][H2]2
C) Rate = k[NO]2[H2]2
D) Rate = k[NO]2[H2]
E) Rate = k[N2][H2O]2/[NO]2[H2]
Which statement describes
characteristics of an
endothermic reaction?
A.
B.
C.
D.
The sign of H is positive, and the products
have less potential energy than the
reactants.
The sign of H is positive, and the products
have more potential energy than the
reactants.
The sign of H is negative, and the
products have less potential energy than
the reactants.
The sign of H is negative, and the
products have more potential energy
than the reactants.
For irreversible chemical reactions the
rate will be affected by changes in all
of these factors except:
 A)
temperature
 B) Concentration of reactants
 C) presence of a catalyst
 D) concentration of products
 E) surface area of solid reactant.
For the following reaction:
NO2(g) + CO(g) → NO(g) + CO2(g), the rate law
is: Rate = k[NO2]2. If a small amount of gaseous
carbon monoxide (CO) is added to a reaction
mixture that was 0.10 molar in NO2 and 0.20
molar in CO, which of the following statements is
true?
a) Both k and the reaction rate remain the
same.
b) Both k and the reaction rate increase.
c) Both k and the reaction rate decrease.
d) Only k increases, the reaction rate
remains the same.
e) Only the reaction rate increases; k
remains the same.
Bozeman and HW Quiz
1. In Bozeman’s video on the reaction path he
talks about the temperature dependence. We
know that reaction rate influences T but is k
dependent on T. Explain.
2. Describe the experiment and scientist
Bozeman mentioned in the video regarding
Multistep reactions. What was it about? Write
whatever you can remember about it?
3. Chemical reaction happens in a test tube
you are holding and as this happens your
hand feels hot.
Sketch the E diagram for this reaction.
1. Describe the experiment and scientist
Bozeman mentioned in the video regarding
Multistep reactions. What was it about? Write
whatever you can remember about it?
2. Chemical reaction happens in a test tube you
are holding and as this happens your hand feels
hot.
Sketch the E diagram for this reaction.
3. Define transition state and draw a diagram
showing it.
Bozeman and HW Quiz
1.
2.
Describe the experiment and scientist
Bozeman mentioned in the video regarding
Multistep reactions. What was it about?
Write whatever you can remember about
it?
Chemical reaction happens in a test tube
you are holding and as this happens your
hand feels cold.
Sketch the E diagram for this reaction.
The specific rate constant, k, for
radioactive beryllium–11 is 0.049 s–1.
What mass of a 0.500 mg sample of
beryllium–11 remains after 28 seconds?
a)
b)
c)
d)
e)
0.250 mg
0.125 mg
0.0625 mg
0.375 mg
0.500 mg
The slow rate of a particular chemical
reaction might be attributed to which of
the following?
a) a low activation energy
b) a high activation energy
c) the presence of a catalyst
d) the temperature is high
e) the concentration of the reactants are
high
The steps below represent a proposed
mechanism for the catalyzed oxidation of CO
by O3.
Step 1: NO2(g) + CO(g) → NO(g) + CO2(g)
Step 2: NO(g) + O3(g) → NO2(g) + O2(g)
What are the overall products of the
catalyzed reaction?
a) CO2 and O2
b) NO and CO2
c) NO2 and O2
d) NO and O2
e) NO2 and CO2
Which energy diagram represents a highly
exothermic reaction that has a small
activation energy? (Assume that all curves
are plotted on the same scale.)
Which procedure will
increases the solubility of KCl
in water?
a) stirring the solute and solvent mixture
b) increasing the surface area of the solute
c) raising the temperature of the solvent
d) increasing the pressure on the surface of the
solvent
The rate of a reaction with just two
reactants is observed to double when
the concentration of one reactant is
doubled and the second reactant is
held constant. The rate is also observed
to increase by a factor of nine when the
concentration of the second reactant is
tripled, holding the concentration of the
first reactant constant. What is the
overall order for this reaction?
(A) 2 (C) 5
(B) 3 (D) 6