A student heats crushed ice in a beaker using an electric heater that supplies energy at a constant rate. The student stirs the contents and records the temperature at intervals.
The table shows the results.
| Time / min | Temperature / °C |
|---|---|
| 0 | −20 |
| 1 | 0 |
| 3 | 0 |
| 5 | 0 |
| 7 | 15 |
| 9 | 45 |
| 11 | 75 |
| 13 | 100 |
| 20 | 100 |
| 30 | 100 |
Use the table to give the melting point of ice.
Calculate the mean rate of temperature rise of the liquid water between 7 minutes and 11 minutes. Give the unit.
The water takes much longer to boil away than the ice takes to melt. Explain why, in terms of the forces between particles.
Explain the changes in temperature shown in the table from 0 minutes to 30 minutes. Your answer should refer to the arrangement, movement and energy of the particles.
53 exam-style questions on Edexcel GCSE Chemistry 3.1 States of matter, covering 3.1.1 The three states of matter and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.