Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Change of State
56 practice questions
Topics covered
Practice questions
11–20 of 31 · Normal
Question 11
4 marks · Normal
Answer and see the solution →A student takes repeated readings of temperature change in a metal block when it is heated for different lengths of time using a heater. The mass of the block is 0.4 kg.
Results from the experiment Heating time (s) Temperature rise (°C) 100 5.0 200 10.2 300 15.0 400 20.1 The heater supplies a constant power of 30 W throughout the experiment.
(a)[2 marks]Plot a graph of temperature rise (y-axis) against heating time (x-axis) for this data. Draw a best-fit line.
(b)[1 mark]Use your graph or the data to find the temperature rise after 250 seconds.
(c)[1 mark]Calculate the specific heat capacity of the metal block using your value from (b).
Question 12
4 marks · Normal
Answer and see the solution →In a school experiment to measure the specific heat capacity of a metal, the calculated value is much higher than the manufacturer's value for that metal.
(a)[2 marks]Suggest two reasons why the result might be higher than expected.
(b)[2 marks]For each reason, explain how it affects the experiment.
Question 13
4 marks · Normal
Answer and see the solution →A student is investigating the specific heat capacity of a 0.40 kg block of lead. The block is heated using an immersion heater connected to a power supply as shown. The voltage across the heater is 15 V and the current is 2.0 A. The heater is switched on for 300 seconds.
(a)[2 marks]Calculate the total thermal energy supplied to the block by the heater.
(b)[2 marks]The temperature of the block increases by 25 °C during the experiment. Calculate the specific heat capacity of lead. Give your answer in J/kg °C.
Question 14
3 marks · Normal
Answer and see the solution →Figure 1 shows a diagram of apparatus used for a specific heat capacity experiment.
Apparatus for measuring specific heat capacity (a)[2 marks]State two measurements that must be taken during this experiment, other than temperature.
(b)[1 mark]Explain why the metal block is often surrounded by insulating material in this type of experiment.
Question 15
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 16
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 17
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 18
1 mark · Normal
Answer and check →Which statement best describes what happens during the boiling of a liquid?
- A.The temperature increases rapidly and then stops.
- B.The added energy is used to increase the speed of the particles.
- C.The energy supplied is used to overcome the forces between the particles, so temperature remains constant.
- D.The liquid evaporates only from the surface, with the temperature increasing all the time.
Question 19
3 marks · Normal
Answer and see the solution →Describe a practical method to obtain a temperature–time graph showing the change of state from solid to liquid for a substance such as naphthalene. Include details on how to make the experiment as accurate as possible.
Question 20
1 mark · Normal
Answer and see the solution →Why is it important to use a water bath instead of a direct flame when heating substances like naphthalene to study their change of state?