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2.2.3a Melting, boiling, condensation and solidification

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Question 105

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

2.2.3a Melting, boiling, condensation and solidification Questions

  1. IGCSE
  2. /Physics
  3. /2.2.3a Melting, boiling, condensation and solidification

313 exam-style questions on CIE IGCSE Physics 2.2.3a Melting, boiling, condensation and solidification. Each one has a worked solution and a mark scheme showing where the marks go.

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