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1. The temperature changes from 35°F during the night to 75°F during the day. What is the temperature change on the Celsius scale?
A. 72 C°
B. 40 C°
C. 32 C°
D. 22 C°

1.
T
100 C o
(75 35) F o
180 F o
5
9 o
(40) C 22.2 C o
So the correct answer is D.

1.
T
100 C o
(75 35) F o
180 F o
5
9 o
(40) C 22.2 C o
So the correct answer is D.
Or, you can convert to Celsius and subtract:
T
1
T
2
T
5
9 o
(35 32) 1.67 C
5
9 o
(75 32) 23.89 C
T
2
T
1 o
23.89 1.67
22.2 C

2. An ideal gas occupies 4.0 L at 20°C. What volume will it occupy at 40°C if the pressure remains constant?
A. 43 cm 3
B. 4.3 L
C. 8.0 L
D. 2.0 L

2. From the ideal gas law
PV nRT
At constant pressure,
V nR
T P
So,
V V
1 2
T T
1 2
Solve for V
2 constant
V
2
T
2
T
1
V
1
The temperature must be in Kelvin.
V
2
40 273
20 273
(4
313
.0 L) = (4.0 L) = 4.3 L
293
So the answer is B.

Done with Qwizdom