Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Solids, Liquids and Gases
279 practice questions
Topics covered
Practice questions
81–90 of 133 · Easy
Question 81
2 marks · Easy
Answer and see the solution →In a specific heat capacity experiment, the heater is supplied with a voltage of 10 V and a current of 2.0 A for 5 minutes. Calculate the total energy supplied by the heater.
Question 82
1 mark · Easy
Answer and check →Which measurement should be recorded BEFORE switching on the heater in a specific heat capacity experiment?
- A.The final temperature of the substance
- B.The initial temperature of the substance
- C.The current supplied by the heater
- D.The time heater is turned on
Question 83
3 marks · Easy
Answer and see the solution →A student wants to find the specific heat capacity of a 0.5 kg block. The electric heater supplies energy for 400 s. The current is 3.0 A and voltage is 12 V. The temperature rise is 16 °C.
(a)[1 mark]Calculate the energy supplied by the heater.
(b)[2 marks]Calculate the specific heat capacity of the block.
Question 84
1 mark · Easy
Answer and see the solution →State what happens to the temperature of a substance during melting, while it is still being heated.
Question 85
1 mark · Easy
Answer and check →Which of the following best describes what happens to the energy supplied to a substance at its boiling point?
- A.It is used to raise the temperature further.
- B.It is used to increase the mass of the substance.
- C.It is used to overcome the forces between molecules.
- D.It is used to break the bonds inside the molecules.
Question 86
2 marks · Easy
Answer and see the solution →Describe what a temperature–time graph would look like for a substance that is being heated steadily as it melts from solid to liquid.
Question 87
2 marks · Easy
Answer and see the solution →Explain why the temperature of a substance does not change during boiling, even though energy is still being supplied.
Question 88
2 marks · Easy
Answer and see the solution →A student heats a solid and records its temperature every minute. Describe how the temperature readings would change if the student continues heating the substance until it has fully melted and then further increases the temperature.
Question 89
3 marks · Easy
Answer and see the solution →A student wants to demonstrate how the temperature of stearic acid (a solid) changes as it melts and then becomes a liquid.
(a)[1 mark]Describe one safety precaution the student should take while heating stearic acid.
(b)[2 marks]Explain what happens to the temperature of stearic acid as it is heated, melts, and then is fully in liquid form.
Question 90
2 marks · Easy
Answer and see the solution →A scientist records the temperature of a pure substance as it is heated steadily. The measured values are shown in the table below.
Temperature vs Time for a Substance being Heated Time (min) Temperature (°C) 0 20 2 40 4 60 6 80 8 80 10 100 Explain what the constant temperature at 80 °C from 6 to 8 minutes shows about what is happening to the substance.