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2.2 Thermal properties and temperature

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Question 166

In a laboratory experiment, a beaker of a hot liquid compound is cooled, and its temperature is recorded at regular intervals of one minute. The table below shows the temperature of the substance over a period of 9 minutes:

Time (minutes)0123456789Temperature (∘C)95847569696961555046 \begin{array}{|l|c|c|c|c|c|c|c|c|c|c|} \hline \text{Time (minutes)} & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\ \hline \text{Temperature } (^\circ\text{C}) & 95 & 84 & 75 & 69 & 69 & 69 & 61 & 55 & 50 & 46 \\ \hline \end{array} Time (minutes)Temperature (∘C)​095​184​275​369​469​569​661​755​850​946​​

What is the melting point of this substance?

A

0 ∘C0\text{ }^\circ\text{C}0 ∘C

B

46 ∘C46\text{ }^\circ\text{C}46 ∘C

C

69 ∘C69\text{ }^\circ\text{C}69 ∘C

D

95 ∘C95\text{ }^\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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