Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Ideal Gas Molecules
70 practice questions
Topics covered
Practice questions
31–40 of 70
Question 31
4 marks · Normal
Answer and see the solution →Figure 1 shows a diagram of an air-filled syringe with its tip sealed. The plunger is pressed in to reduce the volume, while the temperature is kept constant.
An air-filled sealed syringe. (a)[2 marks]Explain what happens to the pressure inside the syringe as the plunger is pushed in (the volume decreases and temperature stays the same).
(b)[2 marks]Describe the motion of the air particles inside the syringe as the plunger is pressed in at constant temperature.
Question 32
1 mark · Easy
Answer and check →Which of the following equations relates the pressure and volume of a fixed mass of gas at constant temperature?
- A.p_1 V_1 = p_2 V_2
- B.p_1/T_1 = p_2/T_2
- C.V_1/T_1 = V_2/T_2
- D.p_1 V_1/T_1 = p_2 V_2/T_2
Question 33
2 marks · Easy
Answer and see the solution →A fixed mass of gas has a pressure of 80 kPa and a volume of 200 cm³. If the volume is reduced to 160 cm³ at constant temperature, calculate the new pressure of the gas.
Question 34
1 mark · Easy
Answer and see the solution →State the rule of pressure and temperature for a fixed mass of gas at constant volume.
Question 35
2 marks · Easy
Answer and see the solution →A gas has a pressure of 105 kPa at 350 K. What will be its pressure at 420 K, if the volume remains constant?
Question 36
1 mark · Easy
Answer and see the solution →Describe what happens to the volume of a gas if its pressure is doubled at constant temperature.
Question 37
2 marks · Easy
Answer and see the solution →Explain, using the idea of molecules, why the pressure of a gas increases if it is heated at constant volume.
Question 38
3 marks · Easy
Answer and see the solution →A student pumps air into a sealed cylinder. The initial pressure is 90 kPa and the volume is 150 cm³.
(a)[2 marks]If the student reduces the volume to 100 cm³ at constant temperature, calculate the final pressure.
(b)[1 mark]State the gas law used in this calculation.
Question 39
1 mark · Easy
Answer and see the solution →Write the equation that connects the initial and final pressure and temperature of a fixed mass of gas at constant volume.
Question 40
3 marks · Normal
Answer and see the solution →A sample of gas is in a cylinder at a pressure of atm and a volume of dm. The gas is compressed to a volume of dm at constant temperature.
Calculate the new pressure of the gas.