Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Ideal Gas Molecules
70 practice questions
Topics covered
Practice questions
21–30 of 35 · Easy
Question 21
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 22
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 23
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 24
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 25
1 mark · Easy
Answer and see the solution →State the value of absolute zero on the Celsius scale.
Question 26
1 mark · Easy
Answer and check →Which statement correctly describes absolute zero?
- A.The temperature at which water freezes.
- B.The lowest temperature possible, where particles have minimum energy.
- C.The temperature at which gases expand most quickly.
- D.The temperature at which metals melt.
Question 27
1 mark · Easy
Answer and see the solution →Write the equation that converts a temperature from Celsius to Kelvin.
Question 28
1 mark · Easy
Answer and check →A scientist cools a gas sample to -10 °C. What is this temperature in Kelvin?
Question 29
1 mark · Easy
Answer and check →The temperature inside a refrigerator is 275 K. What is this temperature in degrees Celsius?
Question 30
2 marks · Easy
Answer and see the solution →Explain why scientists use the Kelvin scale, rather than the Celsius scale, when working with gas laws.