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Figure 5 shows the apparatus used to investigate the melting of some crushed ice - Edexcel - GCSE Physics - Question 3 - 2023 - Paper 2
Question 3
Figure 5 shows the apparatus used to investigate the melting of some crushed ice. (a) (i) Suggest one safety precaution needed when using the electrical heater. (i... show full transcript
Worked Solution & Example Answer:Figure 5 shows the apparatus used to investigate the melting of some crushed ice - Edexcel - GCSE Physics - Question 3 - 2023 - Paper 2
Step 1
Step 2
Step 3
Describe what happens to the crushed ice during the next 15 minutes.
Answer
During the next 15 minutes, the following observations can be made:
- From P to Q: The temperature of the ice increases as it absorbs heat, moving towards 0°C while remaining solid.
- From Q to R: The temperature remains constant at 0°C as the ice starts to melt, creating a mixture of ice and water.
- From R to S: The temperature of the resulting water increases as the ice fully melts into the water.
At the end of the process, the contents transition from solid ice to a liquid state.
Step 4
Calculate the volume, V₂, of the bubble near the surface.
Answer
To calculate the volume, we use the formula: V₂ = rac{P₁ imes V₁}{P₂}
Substituting in the values:
- P₁ = 3.30 atm
- V₁ = 0.50 L
- P₂ = 1.07 atm
Calculating: V₂ = rac{3.30 imes 0.50}{1.07} \approx 1.54 \text{ L}
Thus, the volume of the bubble near the surface is approximately 1.54 litres.