GCSE AQA Physics Combined Science Energy Transfers: A student made measurements to d

Question

A student made measurements to determine the specific heat capacity of vegetable oil.

Figure 2 shows the equipment used.

Describe how the student could use the equipment shown in Figure 2 to determine the specific heat capacity of vegetable oil. [6 marks]

Give one risk when using the equipment in Figure 2. [1 mark]

A different student did not have a joulemeter and calculated the energy transferred by the electric heater.

Use the Physics Equations Sheet to answer questions 02.3 and 02.4.

Write down the equation linking energy transferred (E), power (P) and time (t). [1 mark]

The electric heater had a power output of 50 watts.

Calculate the time taken for the electric element to transfer 4750 joules of energy to the vegetable oil. [3 marks]

In a deep fryer, vegetable oil is heated by an electric heating element. Food is then cooked in the hot vegetable oil.

The deep fryer contains an electrical component to monitor the temperature of the vegetable oil.

Figure 3 shows how the resistance of the electrical component changes with temperature.

What electrical component is used to monitor the temperature of the vegetable oil? [1 mark]

The electric heating element in the deep fryer automatically switches off when the vegetable oil reaches a certain temperature.

Use Figure 3 and Figure 4.

Determine the resistance of the electrical component when the electric heating element automatically switched off. [2 marks]

Some chips were put in the deep fryer.

In the deep fryer, water in the chips underwent a physical change and became steam.

Why is this a physical change? Tick (✓) one box.

All water can change to steam.

No chemicals are involved when water changes to steam.

The change from water to steam can be detected visually.

The water will recover its original properties if the steam is cooled.

A student made measurements to determine the specific heat capacity of vegetable oil - AQA - GCSE Physics Combined Science - Question 2 - 2022 - Paper 1