INVESTIGATING GAS LAWS WORKSHEET - SCH 3U
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1 INESIGAING GAS LAWS WORKSHEE - SCH 3U Review: Convert the following C = K 55 F = C = K 255 cm 3 = L 5500 ml = m mm Hg = kpa 155 kpa = lb/in 2 (1) BOYLE S LAW he Relationship between Pressure and olume P
2 P 1/P Use the graphs above to derive the equation and state Boyle s law. Final working Equation for Boyle s law Using a large syringe with a cap, remove the plunger and place a mini-marshmallow inside. Replace the plunger. Predict what will happen to the marshmallow when you push on the plunger and the volume in the syringe is reduced. ry it. What did you see? Explain. Remove the cap from the syringe and push on the plunger until it is almost in contact with the marshmallow. Replace the cap, ensuring a good seal. Predict what will happen to the marshmallow when you pull back on the plunger and the volume in the syringe is increased. ry it. What did you see? Explain. An online tool to explore gas relationships is available at Set the temperature to constant in the parameters box. Select the ruler function from the tools options. Pump the handle a couple of times to put some gas into the chamber. Adjust the size of the container to make it as large as possible and record the pressure. What will happen to the pressure if the container size is halved? It s About ime 2
3 est this and record the pressure. Now reduce the size of the container by half again. Record the pressure. What do you notice happens in order to keep the temperature constant? (Keep this in mind for the next part of the lesson.) Reset the simulation. his time continue to pump in more gas without adjusting the volume. What eventually has to happen? Word Problems: 1.0 L of a gas at standard temperature and pressure is compressed to 473 ml. What is the new pressure of the gas? Atmospheric pressure on the peak of Mt. Everest can be as low as 150 mm Hg, which is why climbers need to bring oxygen tanks for the last part of the climb. If the climbers carry 10.0 litre tanks with an internal gas pressure of 3.04 x 10 4 mm Hg, what will be the volume of the gas when it is released from the tanks? (2) CHARLES S LAW he Relationship between olume and emperature Use the graph above to derive the equation and state Charles s law. It s About ime 3
4 Final working Equation for Charles s law Press on a ping pong ball to place a small dent in it. hen place the ball in a beaker of water. Heat the beaker on a hotplate until the water boils. What do you observe happening to the ball? Return to the simulation website Reset the simulation if necessary. Set the pressure to constant. Add 50 particles of light species gas into the chamber. What do you predict will happen to the volume of gas if the temperature is reduced by half? Cool the gas down to test your prediction. Now increase the temperature in increments of 25 K, what happens to the volume of the gas? What do you notice about the behaviour of the gas particles? Explain. Now change the constant parameters setting to none. What do you expect will happen to the temperature if the volume of the container is reduced by half? est your prediction. Now make the container as large as possible. What happens to the temperature? Word Problems: he temperature inside my refrigerator is about Celsius. If I place a balloon in my fridge that initially has a temperature of C and a volume of 0.50 litres, what will be the volume of the balloon when it is fully cooled by my refrigerator? I have made a thermometer which measures temperature by the compressing and expanding of gas in a piston. I have measured that at C the volume of the piston is 20 L. What is the temperature outside if the piston has a volume of 15 L? What would be appropriate clothing for the weather? It s About ime 4
5 (3) GAY-LUSSAC S LAW he Relationship between Pressure and emperature P P Use the graph above to derive the equation and state Gay-Lussac s law. Final working Equation for Gay-Lussac s law Carefully observe the pop can demonstration. Describe what happens to the can. Can this be explained using Gay-Lussac s law? Is Gay-Lussacs law the only law represented in this demonstration? Return to the simulation website Reset the simulation if necessary. Set the volume parameter to constant. Pump a small amount of gas into the container. Record the temperature and pressure. What do you predict will happen to the pressure if you cool the gas by half? est your prediction. Now cool the gas as much as possible. Describe what occurs. Now return the temperature of the gas back to its initial setting. Predict what will happen if you double the temperature. est your prediction. Now continue to add heat. Describe what happens. Why does this occur? It s About ime 5
6 When you put air in the tires of your car, the recommended pressures in the owner s manual are for cold pressure, explain what this means and why it is important. Word Problems: he temperature of a sample of gas in a steel container at 30.0 kpa is increased from C to 1.00 x 10 3 C. What is the final pressure inside the tank? If a gas in a closed container is pressurized from 15.0 atmospheres to 16.0 atmospheres and its original temperature was 25.0 C, what would the final temperature of the gas be? It s About ime 6
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