In an experiment, a student heats a solid substance until it completely melts into a liquid, and then allows it to cool. The temperature of the cooling substance is recorded every minute. The table below shows the results.
| Time / minutes | 0.0 | 1.0 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 7.0 | 8.0 | 9.0 | 10.0 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature / ∘C^\circ\text{C}∘C | 85 | 74 | 63 | 63 | 63 | 55 | 48 | 42 | 38 | 35 | 33 |
What is the melting point of this substance?
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.