A student measures the total mass of a beaker containing cold water and ice in a warm, humid room. The measurements are recorded at regular intervals. The results are shown in the table below:
| Time / min | Mass / g |
|---|---|
| 0.0 | 120.0 |
| 2.0 | 120.4 |
| 4.0 | 120.8 |
| 6.0 | 121.2 |
| 8.0 | 121.6 |
Why does the total mass increase over time?
Water vapor from the air condenses onto the cold outer surface of the beaker.
The ice inside the beaker melts into liquid water.
Liquid water from the beaker evaporates into the air.
The water inside the beaker expands as its temperature rises.
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.