Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Change of State
56 practice questions
Topics covered
Practice questions
21–30 of 56
Question 21
3 marks · Easy
Answer and see the solution →A group of students wants to determine the specific heat capacity of a 0.3 kg sample of metal, using the apparatus shown.
(a)[1 mark]State the equation used to calculate the specific heat capacity (c) of the metal.
(b)[2 marks]List two measurements (other than mass) that the students must record during the experiment.
Question 22
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 23
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 24
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 25
4 marks · Normal
Answer and see the solution →A student carries out an experiment to measure the specific heat capacity of a piece of copper metal using the apparatus below.
(a)[1 mark]State the equation used to calculate the energy supplied by the heater.
(b)[3 marks]The student measures the following values: - Mass of copper, - Voltage supplied by heater, - Current through heater, - Heating time, - Initial temperature, - Final temperature, Calculate the specific heat capacity of copper found by the experiment.
Question 26
4 marks · Normal
Answer and see the solution →A student wants to find the specific heat capacity of water using an electric immersion heater.
(a)[2 marks]Describe how the student could carry out this experiment. You may refer to apparatus, measurements, and calculations. List at least three key steps.
(b)[1 mark]State one precaution the student should take to improve the accuracy of the result.
(c)[1 mark]Explain why a lid is used on the beaker during the experiment.
Question 27
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 28
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 29
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 30
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.