Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Change of State
56 practice questions
Topics covered
Practice questions
51–56 of 56
Question 51
4 marks · Easy
Answer and see the solution →A student investigates how heating a solid wax block causes it to change state.
(a)[2 marks]Describe how the arrangement and movement of particles change as the wax is heated from a solid to a liquid.
(b)[2 marks]Explain why the temperature of the wax stays constant for a short time during melting, even though energy is still being supplied.
Question 52
4 marks · Easy
Answer and see the solution →A student sets up a practical to investigate the specific heat capacity of a metal block.
(a)[2 marks]List two measurements the student must take to calculate the specific heat capacity.
(b)[2 marks]State and explain one reason why the calculated value of the specific heat capacity might be higher than the true value.
Question 53
6 marks · Normal
Answer and see the solution →A student carries out an experiment to find the specific heat capacity of water. The following results are obtained:
Experimental Data Mass of water (kg) Initial temp (°C) Final temp (°C) Current (A) Voltage (V) Time (s) 0.80 20 60 2.0 12 300 (a)[2 marks]Calculate the total energy supplied by the heater (in J).
(b)[3 marks]Use the data to calculate the specific heat capacity of water based on this experiment.
(c)[1 mark]Suggest one reason why the value found might be higher than the actual specific heat capacity of water.
Question 54
6 marks · Normal
Answer and see the solution →A student heats a beaker of ice at -10 °C. The temperature is measured every minute and the following readings are recorded:
Temperature of Ice/Water Over Time Time (min) Temperature (°C) 0 -10 2 -5 4 0 8 0 10 10 (a)[3 marks]Describe the changes in the state of the substance over the 10 minutes.
(b)[2 marks]Explain why the temperature remains at 0 °C from 4 to 8 minutes, even though energy is still being supplied.
(c)[1 mark]Using the particle model, describe what happens to the arrangement and movement of particles during this period.
Question 55
7 marks · Normal
Answer and see the solution →A student uses an electric heater to warm a metal block from room temperature. The temperature of the block is recorded every minute. After some time, the block begins to melt.
(a)[3 marks]Describe how the arrangement and motion of the particles in the block change as it is heated and melts.
(b)[3 marks]When the temperature is rising, the student records a temperature change of 24 °C for a 0.4 kg block. The heater supplies 8400 J of energy during this time. Calculate the specific heat capacity (c) of the metal.
(c)[1 mark]Explain why the temperature remains constant while the block is melting, even though the heater is still supplying energy.
Question 56
6 marks · Normal
Answer and see the solution →In an experiment to find the specific heat capacity of a liquid, the following apparatus is set up:
Apparatus for specific heat capacity experiment The experiment is performed twice with the same mass of liquid but different power outputs of the heater. The following data is collected:
Experimental data Trial Mass (kg) ΔT (°C) Heater Power (W) Time (s) 1 0.5 20 40 400 2 0.5 15 50 300 (a)[1 mark]Write down the equation needed to calculate the specific heat capacity of the liquid from the energy supplied and the temperature change.
(b)[3 marks]Calculate the specific heat capacity from the data in Trial 1. Show your working.
(c)[2 marks]Suggest one practical reason why the values obtained in Trials 1 and 2 may not be exactly the same.