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.
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.