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CHM 152
Group Work 1 Summer 2009
Crib
1.
What is the rate law for this reaction?
H
3
BO
3
+ 3 HCl
J
BCl
3
+ 3 H
2
O
___
rate =
k
[H
3
BO
3
]
x
[HCl]
y
2.
If the concentration of a reactant is doubled and the corresponding rate quadruples, what is the order with respect to
that reactant?
____
2_
3.
To graphically find the rate constant for a first order reaction you should plot __
ln A
t
___ versus time.
4.
What is the half-life for a first order reaction if the initial concentration of reactant is 1.25M and after 69.2 seconds
the concentration has dropped to 0.955M?
Ln (.955 / 1.25) = -
k
(69.2s)
solve for
k
= 3.89 x 10
-3
s
-1
then t
1/2
= .693 /
k
= 178 s
5.
What percentage of a sample remains after 5 half lives?
__
3.125%
____
6.
What is the rate law for a zero order overall reaction? ____
rate =
k
___
7.
If an elementary step has two reactants, what is its molecularity? ___
bimolecular
____
8.
The slow step in a mechanism is also called the __
rate determining
__ step.
9.

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