Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 2
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144)
T he
F irst
L aw
o f
T hermodynamics
c an
b e
q uantitatively
s ummarized
b y
t he
e quation:
∆ E
=
q
+
w
a) What
d oes
q
r epresent?
H eat
a dded
t o
o r
l ost
f rom
a
s ystem
b) What
d oes
w
r epresent?
W ork
d one
b y
o r
o n
t he
s ystem
c) Under
w hat
c onditions
w ill
t he
q uantities
q
a nd
w
b e
n egative
n umbers?
D iscuss
e ach
s eparately.
Q
i s
n egative
w hen
h eat
i s
l ost,
w
i s
n egative
w hen
w ork
i s
d one
b y
s ystem
o n
s urroundings
5)
C alculate
∆ E
a nd
d etermine
i f
t he
p rocess
i s
e ndothermic
o r
e xothermic
f or
t he
f ollowing
c ases:
WATCH
Y OUR
U NITS!!
a) A
s ystem
a bsorbs
8 5
k J
o f
h eat
f rom
i ts
s urroundings
w hile
d oing
2 9
k J
o f
w ork
o n
t he
surroundings.
56
k J
b) q
=
1 .50
k J
a nd
w
=
– 657
J
0.843
k J
c) The
s ystem
r eleases
5 7.5
k J
o f
h eat
w hile
d oing
1 3.5
k J
o f
w ork
o n
t he
s urroundings.
-‐‑ 7 1
k J
6)
C alculate
∆ E
f or
e ach
o f
t he
f ollowing
c ases:
a) q
=
+
5 1
k J,
w
=
-‐‑
1 5
k J
36
K J
b) q
=
+
1 00.
k J,
w
=
-‐‑
6 5
k J
35
K J
c) q
=
-‐‑
6 5
k J,
w
=
-‐‑
2 0
k J
-‐‑ 8 5
K J
d) In
w hich
o f
t hese
c ases
d oes
t he
s ystem
d o
w ork
o n
t he
s urroundings?
All
o f
t hem
–
a ll
h ave
-‐‑ w
7)
C alculate
∆ E
f or
e ach
o f
t he
f ollowing:
a) q
=
-‐‑
4 7
k J,
w
=
+
8 8
k J
41
k J
b) q
=
+
8 2
k J,
w
=
+
4 7
k J
129
k J
c) q
=
+
4 7
k J,
w
=
0
47
k J
d) In
w hich
o f
t hese
c ases
d o
t he
s urroundings
d o
w ork
o n
t he
s ystem?
A+B
=
+
w
8)
A
s ystem
r eleases
1 25
k J
o f
h eat
w hile
1 04
k J
o f
w ork
i s
d one
o n
t he
s ystem.
C alculate
t he
c hange
i n
internal
e nergy
( in
k J).
-‐‑ 2 1
k J
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