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A student investigated how the temperature of a sample of a solid substance varied as it was heated at a constant rate until it melted and then boiled. The student's results are shown in the graph below. A temperature-time heating curve showing temperature in degrees Celsius on the y-axis, from 0 to 180, and time in seconds on the x-axis, from 0 to 500. The graph contains five distinct sections: a linear rise from (0 s, 10 ^oC) to (30 s, 40 ^oC); a horizontal plateau at 40 ^oC from 30 s to 90 s; a linear rise from (90 s, 40 ^oC) to (250 s, 120 ^oC); a longer horizontal plateau at 120 ^oC from 250 s to 450 s; and a final linear rise from (450 s, 120 ^oC) to (500 s, 150 ^oC).

a.

Explain how the graph shows that the specific heat capacity of the solid substance is less than the specific heat capacity of the liquid substance.

[2]
b.

Explain how the graph shows that the specific latent heat of fusion is less than the specific latent heat of vaporisation.

[2]
c.

When the substance was boiling, 0.050 kg0.050\text{ kg}0.050 kg of the liquid turned into gas. The energy transferred to the substance during this period was 90 kJ90\text{ kJ}90 kJ. Calculate the specific latent heat of vaporisation of the substance. Give the unit.

[4]

Internal energy and energy transfers Questions

Practise AQA GCSE Physics Internal energy and energy transfers with exam-style questions for Foundation and Higher tier. 48 questions covering Internal energy, Temperature changes in a system and specific heat capacity, and Changes of state and specific latent heat, matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Internal energy and energy transfers Questions

  1. GCSE
  2. /Physics
  3. /Internal energy and energy transfers