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Figure 19 shows a small piece of copper about 3 cm high - Edexcel - GCSE Physics - Question 8 - 2020 - Paper 1
Question 8
Figure 19 shows a small piece of copper about 3 cm high. A student wants to determine the density of copper. The student uses a balance to measure the mass of the ... show full transcript
Worked Solution & Example Answer:Figure 19 shows a small piece of copper about 3 cm high - Edexcel - GCSE Physics - Question 8 - 2020 - Paper 1
Step 1
Explain how the student could measure the volume of the piece of copper.
Answer
To measure the volume of the piece of copper, the student can use a measuring cylinder or a Eureka can.
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Using a measuring cylinder: The student can fill the measuring cylinder with water to a certain level. Then, they immerse the piece of copper in the water, ensuring that no air bubbles cling to the surface. The increase in the water level indicates the volume of the copper.
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Using a Eureka can: The student can fill the Eureka can with water and insert a spout. By placing the copper piece into the can, water will be displaced and flow out of the spout. The volume of this displaced water can be collected in a measuring cylinder, providing the volume of the copper piece.
Step 2
Step 3
Calculate a value for the specific heat capacity of copper.
Answer
Using the formula:
ΔQ = m \times c \times Δθ,
where ΔQ is the thermal energy gained (1050 J), m is the mass of the copper (0.058 kg), and Δθ is the change in temperature (from 100 °C to 22 °C, which is 100 - 22 = 78 °C).
We rearrange the formula to find c:
c = \frac{ΔQ}{m \times Δθ} = \frac{1050}{0.058 \times 78} = 230 , \text{ J/kg °C.}
Therefore, the specific heat capacity of copper is approximately 230 J/kg °C.
Step 4
Step 5
State two ways that the experiment could be improved.
Answer
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Reduce heat loss from water by insulating the beaker or using a lid to cover it, which would minimize heat exchange with the surrounding environment.
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Ensure more accurate temperature measurements by using a calibrated thermometer or additional measuring equipment to confirm the temperatures of both the boiling water and the cold water.
Step 6
Describe how this coil could be used instead of the Bunsen burner in Figure 20.
Answer
The coil can be used to provide a consistent and controllable heat source. By connecting the coil to a low voltage power supply, it can be heated up to maintain boiling water without the use of an open flame. This allows for better temperature control and reduces the risk of overheating or ignition of surrounding materials, ensuring that the experiment is conducted safely.