2. We assumed that during the course of the experiment the atmospheric pressure in the room was constant, however this may not be so. Explain the following: If the pressure in the room decreased while you were heating the gas, the volume of the increase. But if the pressure in the room increased while you were heating the gas, the volume of the gas may increase, decrease or even remain the same during the course of the experiment. would still sea

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Chapter8: Gases
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Length of Air Column (thermometer units)
50
Lab 14
Charles' Law
Introduction:
The volume an amount of trapped gas occupies depends on the temperature and pressure
of the gas. If we increase the temperature of the gas while keeping the pressure of the gas
constant what happens to the volume of the gas? As the temperature of the gas increases
the average kinetic energy of the gas particles increases. This means that the particles are
moving on average faster and with collide with the walls of the container more often and
with greater force. This would result in an increase in the pressure of the gas. The only
way we can keep the pressure constant is to increase the volume of the gas. This allows
the greater force to be distributed over a greater area, thus keeping the pressure constant.
Similarly, if you decrease the temperature of the gas the volume decreases. Scientists
wondered if there was a temperature so low that the volume of the gas would drop to
zero. This would be the lowest temperature possible and could serve as the zero point in
an absolute temperature scale. Since there is a linear relationship between temperature
and volume it is possible to measure the volume at different temperatures, plot the values
on a graph and extrapolate the line to the temperature where the volume would be zero.
Charles' Law Graph
09
30
20
10
-250
ode-
Temperature (C)
In this experiment you will be working with a sample of gas (air) trapped in a narrow
glass capillary tube. The bottom of the tube is sealed and the gas is held in the tube by a
small plug of oil near the open end of the tube. This oil plug acts as a frictionless piston
that allows the volume of the gas to expand as the temperature increases. This keeps the
pressure inside the tube equal to the constant pressure of the atmosphere.
Since the gas is in a cylindrical container the volume of the container can be calculated:
V = Tr" 1, where r= gas.
inner radius of the capillary and 1 = length of the column of
Since r and rt are constant, you can simply plot the length in place of the volume in your
graph. You can measure the length of this column using the markings on your
%3D
%3D
hermometer.
Transcribed Image Text:Length of Air Column (thermometer units) 50 Lab 14 Charles' Law Introduction: The volume an amount of trapped gas occupies depends on the temperature and pressure of the gas. If we increase the temperature of the gas while keeping the pressure of the gas constant what happens to the volume of the gas? As the temperature of the gas increases the average kinetic energy of the gas particles increases. This means that the particles are moving on average faster and with collide with the walls of the container more often and with greater force. This would result in an increase in the pressure of the gas. The only way we can keep the pressure constant is to increase the volume of the gas. This allows the greater force to be distributed over a greater area, thus keeping the pressure constant. Similarly, if you decrease the temperature of the gas the volume decreases. Scientists wondered if there was a temperature so low that the volume of the gas would drop to zero. This would be the lowest temperature possible and could serve as the zero point in an absolute temperature scale. Since there is a linear relationship between temperature and volume it is possible to measure the volume at different temperatures, plot the values on a graph and extrapolate the line to the temperature where the volume would be zero. Charles' Law Graph 09 30 20 10 -250 ode- Temperature (C) In this experiment you will be working with a sample of gas (air) trapped in a narrow glass capillary tube. The bottom of the tube is sealed and the gas is held in the tube by a small plug of oil near the open end of the tube. This oil plug acts as a frictionless piston that allows the volume of the gas to expand as the temperature increases. This keeps the pressure inside the tube equal to the constant pressure of the atmosphere. Since the gas is in a cylindrical container the volume of the container can be calculated: V = Tr" 1, where r= gas. inner radius of the capillary and 1 = length of the column of Since r and rt are constant, you can simply plot the length in place of the volume in your graph. You can measure the length of this column using the markings on your %3D %3D hermometer.
Lab 14
Charles' Law
Report Sheet
Name Alexandra T
Lab Day
Scale reading of bottom of capillary tube I
28
10.2
Scale reading
Scale reading of top of capillary tube
Temp °C
25.2
36
55.1
28
30
31.9
33.9
85.2
37
39
-0: - 143.125
TLE
て2
Calculated temperature at which length would = 0 : ~
Questions:
1. Will the volume of the air in the tube actually fall to zero if you lowered the
temperature of the gas to -273°C? Why or why not. The two main components of air are
the real gases N2 and O2. Look up the melting and boiling points of these two gases.
These numbers may help you answer this question.
%3D
2. We assumed that during the course of the experiment the atmospheric pressure in the
room was constant, however this may not be so. Explain the following: If the pressure in
the room decreased while you were heating the gas, the volume of the gas would still
increase. But if the pressure in the room increased while you were heating the the
volume of the gas may increase, decrease or even remain the same during the course of
the experiment.
gas,
3. Use the best fit equation that was calculated by excel for your data to calculate the
temperature to which the gas would need to be increased so that it would occupy the
entire capillary tube. You will need to calculate the length of the capillary tube in
thermometer units to answer this question.
9.
Transcribed Image Text:Lab 14 Charles' Law Report Sheet Name Alexandra T Lab Day Scale reading of bottom of capillary tube I 28 10.2 Scale reading Scale reading of top of capillary tube Temp °C 25.2 36 55.1 28 30 31.9 33.9 85.2 37 39 -0: - 143.125 TLE て2 Calculated temperature at which length would = 0 : ~ Questions: 1. Will the volume of the air in the tube actually fall to zero if you lowered the temperature of the gas to -273°C? Why or why not. The two main components of air are the real gases N2 and O2. Look up the melting and boiling points of these two gases. These numbers may help you answer this question. %3D 2. We assumed that during the course of the experiment the atmospheric pressure in the room was constant, however this may not be so. Explain the following: If the pressure in the room decreased while you were heating the gas, the volume of the gas would still increase. But if the pressure in the room increased while you were heating the the volume of the gas may increase, decrease or even remain the same during the course of the experiment. gas, 3. Use the best fit equation that was calculated by excel for your data to calculate the temperature to which the gas would need to be increased so that it would occupy the entire capillary tube. You will need to calculate the length of the capillary tube in thermometer units to answer this question. 9.
Expert Solution
Step 1

As per the phenomenon of the expansion of gas in a piston, it is known that if external pressure is less than the internal pressure of the piston, the piston will start to apply more pressure to do work on the surroundings and the gas inside the piston will expand.

On the other hand, if external pressure is more than the internal pressure of the piston then the surroundings will do work on the piston to push it inward and the gas inside the piston will compress.

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