5.16 Answers 28 October 2011 11:11 Answers
1. What variable remains constant for this experiment? Volume
2. Explain in terms of the particles what happened to the pressure when the temperature increased When the temperature is increased the particles have a greater average KE and therefore hit the walls of the container with more force and more frequently. This increases the pressure.
3. Is the temperature proportional to the average speed? Justify your answer No; the graph is not a straight line [cid:image001.png@01CCA052.32A52D30]
4. Is the temperature proportional to the average kinetic energy of the particles? Justify your answer Yes; the graph of temperature against (average speed of particles)2 is a straight line. [cid:image002.png@01CCA052.32A52D30] NB: m, the mass of the particles is a constant and so will only affect the gradient of the graph, not the shape of the graph
5. Why is the word 'average' used? The particles in the container have got a range of speeds and therefore a range of KEs. Some particles will be moving faster and some slower but, on average, T α KE. You can view this in the programme. Click on "measurement tool", "energy histograms". [cid:image003.png@01CCA052.32A52D30]
1. What variable remains constant for this experiment? Volume
2. Explain in terms of the particles what happened to the pressure when the temperature increased When the temperature is increased the particles have a greater average KE and therefore hit the walls of the container with more force and more frequently. This increases the pressure.
3. Is the temperature proportional to the average speed? Justify your answer No; the graph is not a straight line [cid:image001.png@01CCA052.32A52D30]
4. Is the temperature proportional to the average kinetic energy of the particles? Justify your answer Yes; the graph of temperature against (average speed of particles)2 is a straight line. [cid:image002.png@01CCA052.32A52D30] NB: m, the mass of the particles is a constant and so will only affect the gradient of the graph, not the shape of the graph
5. Why is the word 'average' used? The particles in the container have got a range of speeds and therefore a range of KEs. Some particles will be moving faster and some slower but, on average, T α KE. You can view this in the programme. Click on "measurement tool", "energy histograms". [cid:image003.png@01CCA052.32A52D30]
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