Chemistry 1b Midterm 2 Worksheet With Answers Page 2
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8Fundamental Questions
Each of these fundamental chemistry questions is worth 5 points. You must show work
to get credit. Little to no partial credit will be rewarded. Make sure to report answers in
the correct number of significant figures and with the proper units.
5 pts
1)
For the following equation
(g) CO
CH
OH(l) + O
(g) + H
O(l)
3
2
2
2
What is oxidized and what is the reducing agent?
C -2 +4 lost electrons
C was oxidized
CH
OH Reducing Agent
3
2)
5 pts
Given the following reaction mechanism:
Cl ⇌ ClO
2NO
+ N
O +ClO
2
2
2
⇌ NO
N
O + ClO
+ NOCl
2
2
2
NOCl + ClO NO
+Cl
2
2
Write the overall reaction.
Identify the intermediate(s) if any in the reaction.
Identify the catalyst(s) if any in the reaction.
Overall Reaction
Cl 2NO
2NO
+ Cl
2
2
2
Intermediates
N
O, ClO
, NOCl, and ClO
2
2
Catalysts
None
nd
5 pts
3)
What is the 2
half life for a second order reaction with k = 22
1
and an
s
initial concentration of 12 M.
st
1
½ life
[A]
= 12 M
[A]= 6.0 M
o
nd
2
½ life
[A]
= 6 M
[A]= 3.0 M
o
nd
2
Order Reaction
1
1
kt
A
A
1
1
22
1
t
s
3
0 .
M
6
0 .
M
t
. 0
0076
s
2
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