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2.2 Thermal properties and temperature

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Question 341

In an experiment, a thermometer is used to measure the temperature of a hot liquid as it cools in a test-tube. The temperature of the substance is recorded every minute. The table below shows the results:

Time / minutes0.01.02.03.04.05.06.07.08.09.010.0Temperature / ∘C9584756969696256514744 \begin{array}{|l|c|c|c|c|c|c|c|c|c|c|c|} \hline \text{Time / minutes} & 0.0 & 1.0 & 2.0 & 3.0 & 4.0 & 5.0 & 6.0 & 7.0 & 8.0 & 9.0 & 10.0 \\ \hline \text{Temperature / } ^\circ\text{C} & 95 & 84 & 75 & 69 & 69 & 69 & 62 & 56 & 51 & 47 & 44 \\ \hline \end{array} Time / minutesTemperature / ∘C​0.095​1.084​2.075​3.069​4.069​5.069​6.062​7.056​8.051​9.047​10.044​​

What is the melting point of the substance?

A

44 ∘C44\ ^\circ\text{C}44 ∘C

B

69 ∘C69\ ^\circ\text{C}69 ∘C

C

75 ∘C75\ ^\circ\text{C}75 ∘C

D

95 ∘C95\ ^\circ\text{C}95 ∘C

Markscheme

2.2 Thermal properties and temperature Questions

  1. IGCSE
  2. /Physics
  3. /2.2 Thermal properties and temperature

528 exam-style questions on CIE IGCSE Physics 2.2 Thermal properties and temperature, covering 2.2.1 Thermal expansion of solids, liquids and gases, 2.2.2a Internal energy and temperature, 2.2.2b Specific heat capacity, 2.2.3a Melting, boiling, condensation and solidification, 2.2.3b Evaporation, and 2.2.3c Cooling by evaporation. Each one has a worked solution and a mark scheme showing where the marks go.

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