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8 marksThermal Measurements

CSEC Physics · May/June 2014 · Paper 2 · Question 1(e)

If 15 g of the substance was cooled from 90.0°C to 57.5°C, calculate the heat, in kilojoules, which was lost in this activity. [Specific Heat Capacity of Substance = 1763 Jkg⁻¹ K⁻¹ ] [Specific Latent Heat of Fusion of Substance = 215 000 Jkg⁻¹. ]

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Other parts of this question

  1. 1(a)Plot, on page 3, a graph of Temperature (θ/°C) versus Time (t/mins). Begin both axes at the origin and insert the letters A, B, C and D on the graph.[7 marks]
  2. 1(b)Using a dotted line on the graph, determine the melting point of the substance that was heated.[2 marks]
  3. 1(c)(i)In what state is the substance as it moves between points B and C?[1 mark]
  4. 1(c)(ii)Explain why the temperature was constant between B and C.[1 mark]
  5. 1(d)(i)State the phase of the substance at C.[1 mark]
  6. 1(d)(ii)Describe what is happening to the substance between C and D.[1 mark]
  7. 1(f)Complete Table 2 to show the symbols and SI units for the physical quantities given.[4 marks]

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