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CHEM 102 - Recitation Week 4
Using the
"Key Concepts"
and the
"Key Equations and Relationships"
in the
Chapter
Summary
at the end of each chapter, identify and type
in this Word document
some
concepts
and/or equations
needed to solve each item. Be prepared to share your ideas in class
discussions. You are NOT required to solve the problems in detail. If you choose to do it to better
participate in class discussion, keep in mind that full problem-solving is not graded for the pre-
recitation assignment. To get full recitation credit, you must
identify at least 1-2
correct and
also different
concepts for each question
(see the
Answer Key
posted for week 1, which shows
comprehensive examples of concept identification).
Copying and pasting very general
concepts (such as, “units of measure” or “dimensional analysis”, etc.) as the only identified
concepts for multiple questions is not allowed.
Ch. 21, 35
Write structural formulas for each of the nine structural isomers of heptane.
Hydrocarbon equations
Writing structural formulas
Alkanes vs alkenes vs alkyne
Structural isomers
Ch. 21, 50
Write structural formulas for each of the possible isomers of
n
-pentyne that are
formed by moving the position of the triple bond.
Writing structural formulas
Alkanes vs alkenes vs alkyne
Hydrocarbon equations
Ch. 21, 94
Determine whether each pair of structures are isomers or the same molecule drawn
differently.
Functional groups
Differentiating isomers
Geometric isomerism
Ch. 12, 69
Teflon is an addition polymer formed from the monomer shown here. Draw the
structure of the polymer.
Polymers
Monomers
Drawing structural formulas
Ch. 14, 27.
Consider the reaction indicated by the chemical equation below:
2 HBr
(g)
→ H
2
(g)
+ Br
2
(g)
a)
Express the rate of the reaction in terms of the change in concentration of each of the reactions
and products.
b)
In the first 25.0 s of this reaction, the concentration of HBr drops from 0.600 M to 0.512 M.
Calculate the average rate of the reaction during this time interval.
c)
If the volume of the reaction vessel in part
b)
is 1.50 L, what amount of Br
2
(in moles) forms
during the first 15.0 s of the reaction?
Reaction Rate laws and orders
Rate of reaction
Ch. 14, 32.
Consider the reaction indicated by the chemical equation below and complete the
table:
8 H
2
S
(g)
+ 4 O
2
(g)
→ 8 H
2
O
(g)
+ S
8
(g)
[H
2
S]/
t
[O
2
]/
t
[H
2
O]/
t
[S
8
]/
t
Rate
- 0.080 M/s
Reaction rate laws and order
Effect of temperature on reaction rate
Ch. 14, 41.
A reaction in which
A
,
B
, and
C
react to form products is first order in
A
, second
order in
B
, and zero order in
C
.
a)
Write a rate law for the reaction.
b)
What is the overall order of the reaction?
c)
By what factor does the reaction rate change if
[A]
is doubled, while the rest of reactant
concentrations are held constant?
d)
By what factor does the reaction rate change if
[B]
is doubled, while the rest of reactant
concentrations are held constant?
e)
By what factor does the reaction rate change if
[C]
is doubled, while the rest of reactant
concentrations are held constant?
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f)
By what factor does the reaction rate change if the concentrations of all three reactants are
doubled?
Rate laws
Reaction order
Overall order
Reactants vs products
Ch. 14, 46.
The tabulated data were collected for the reaction indicated by the
chemical equation below
:
CH
3
Cl
(g)
+ 3 Cl
2
(g)
→ CCl
4
(g)
+ 3 HCl
(g)
[CH
3
Cl] (M)
[Cl
2
] (M)
Initial Rate (M/s)
0.050
0.050
0.014
0.100
0.050
0.029
0.100
0.100
0.041
0.200
0.200
0.115
Write the reaction rate law equation and calculate the value of the rate constant,
k
.
What is the overall order of reaction?
Overall order
Rate laws
Components of a chemical equation
Ch. 14, 123.
A student says,
"The initial concentration of a reactant was doubled, and the rate doubled. Therefore, the
reaction is second order in that reactant".
Why might the student say that? What is wrong with the statement? What is the actual order
with respect to the reactant? Explain your reasoning briefly and clearly.
Rate constant
Reaction order
Honors only
Ch. 12, 72
Nomex, a condensation copolymer used by firefighters because of its flame-resistant
properties, forms from isophthalic acid and
m
-aminoaniline. Draw the structure of the dimer and
of the polymer.
(
Hint
:
Water is eliminated when a
carboxyl
group from one monomer reacts with an
amino
group from the other monomer.)
Isophthalic acid:
m-Aminoaniline
:
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