Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Change of State
56 practice questions
Topics covered
Practice questions
31–40 of 56
Question 31
4 marks · Normal
Answer and see the solution →A student records the following data in a specific heat capacity experiment on a 0.30 kg block of material:
Experimental data Quantity Reading Initial temperature / °C 18 Final temperature / °C 34 Voltage / V 12 Current / A 3.5 Time / s 200 (a)[1 mark]Calculate the change in temperature of the block.
(b)[2 marks]Calculate the energy supplied by the heater.
(c)[1 mark]Use your answers to calculate the specific heat capacity of the material.
Question 32
3 marks · Normal
Answer and see the solution →A student is recording temperature readings during a specific heat capacity experiment and finds that the measured specific heat capacity is much lower than the accepted value for the material.
State and explain two possible experimental errors that could cause the measured value to be too low.
Question 33
3 marks · Normal
Answer and see the solution →Describe a method that a student could use to find the specific heat capacity of water using an electric heater. Include the main steps and measurements the student would need to make.
Question 34
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 35
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 36
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 37
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 38
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 39
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 40
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.