A student places small blocks of solid paraffin wax into a beaker of liquid olive oil.
The table below shows the density of solid paraffin wax and of liquid olive oil:
| Density (g/cm3\text{g/cm}^3g/cm3) | |
|---|---|
| Solid paraffin wax | 0.88 |
| Liquid olive oil | 0.92 |
Explain why the blocks of solid paraffin wax float in the liquid olive oil.
The volume of one block of solid paraffin wax is 4.5 cm34.5\text{ cm}^34.5 cm3. Calculate the mass of this block of wax.
Some solid paraffin wax is heated on a metal plate until it changes from a solid into a liquid.
State the name of the process when a solid changes into a liquid.
Describe the changes in the arrangement and motion of the particles as the wax changes from solid to liquid.
Later, some of the liquid wax is spilled on a very hot engine surface. State the name of the process that causes the liquid wax to slowly disappear into the air as a gas.
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.