Exam (elaborations)
Exam 3 Chem (1)
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- GPSTC Class 290
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- GPSTC Class 290
Exam of 6 pages for the course GPSTC Class 290 at GPSTC Class 290 (Exam 3 Chem (1))
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Exam 3 ChemFind P1 using Boyle's Law if the following values are used: V1= 1.90 L, P2= 4.19
atm, and V2= 1.09 L. State your answer as a number with two sig figs in atm. -
CORRECT ANSWER-2.4
A sample of gas has an initial volume of 4.95 L at a pressure of 700 mm Hg. If the
volume of the gas is increased to 5.38 L, what is the pressure? - CORRECT
ANSWER-b
644 mm Hg
1 atm is equal to: - CORRECT ANSWER-e
all of the above
A balloon has 0.500 L of air in it with a pressure of 3.25 atm. What is the volume of
the balloon with a pressure of 5.00 atm? - CORRECT ANSWER-0.325
If a balloon is filled to 3.00L at 2.50 atm, what is volume of balloon at sea level? -
CORRECT ANSWER-a
7.50 L
Initial volume in a cylinder is 750 ml, if pressure changes from 840 mm Hg to 360
mm Hg, what is the final volume of this gas? - CORRECT ANSWER-d
1.750 L
According to Boyle's Law, as volume increases, pressure
blank1 - - CORRECT ANSWER-decreases
Why do airplanes pressurize the air in their cabins? - CORRECT ANSWER-a
Because they fly between 25,000 to 40,000 feet, the pressure is about .5 atm.
Convert 38.6 mmHg to atm. (760 mmHg=1 atm which is about sea level). Use three
sig figs for answer. - CORRECT ANSWER-b
.0508 atm
A 14.8L balloon is at 255K. What is its volume if its temperature is 304K? Answer by
using a number with three sig figs only. - CORRECT ANSWER-17.6
What happens to the volume of a balloon when placed in ice water? What law does
this apply to? - CORRECT ANSWER-d
Volume decreases as temperature decreases according to Charles law.
, 4L of neon are at 323 K. The next day, the temperature decreases to 290 K, what is
the new volume? Express your answer as a number with two sig figs only. -
CORRECT ANSWER-3.6
Hydrogen gas occupies 2 liters of volume at a temperature of 32 degrees Celsius.
What is its temperature when it has a volume of 4 liters? Answer as a number with
two sig figs only. - CORRECT ANSWER-64.0
An oxygen tank holds 4.5 liters of gas at 305 K. What temperature would be needed
to change the volume to 2.2 liters? - CORRECT ANSWER-d
149K
Why do hot air balloons rise? - CORRECT ANSWER-a
Hot air rises because the volume of a gas at a constant pressure will increase with
increasing temperature.
What is the pressure of a 3.00 L gas vessel that has 18.0 grams of helium at 25
degrees Celsius? - CORRECT ANSWER-b
36.7 atm
Which set of conditions reflect STP? - CORRECT ANSWER-d
273 K, 1 atm
How many moles of gas were added to a cylinder that started with 2.3 moles of gas
and a volume of 1.4 L given that the final volume was 7.2 L? express your answer as
a number with two sig figs only. - CORRECT ANSWER-9.5
What is the final volume of a .5 L gas container that increased in temperature from
299 K to 333 K when pressure increased from 1.00 atm to 1.54 atm? - CORRECT
ANSWER-c
0.362 L
What is the final volume of a cylinder that was initially 0.5 L at 25 degrees Celsius
and was then heated to 50 degrees Celsius? - CORRECT ANSWER-d
0.542 L
A specific volume of gas was maintained in a container. If the pressure of the gas in
the container doubled, what would happen to the temperature? - CORRECT
ANSWER-a
The temperature doubled.
What is the proper form of the combined gas law? - CORRECT ANSWER-c
P1V1/T1= P2V2/T2
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