A student measures the mass of liquid ethanol in an open beaker over two hours. The beaker is kept in a warm room. The results are shown in the table:
| Time / hours | Mass of ethanol / g |
|---|---|
| 0.0 | 45.2 |
| 0.5 | 40.1 |
| 1.0 | 35.3 |
| 1.5 | 30.8 |
| 2.0 | 26.5 |
Why does the mass of the ethanol decrease?
The ethanol condenses.
The ethanol evaporates.
The ethanol freezes.
The ethanol melts.
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.