A student heats one end of a metal rod using a heater at constant power. All the temperature sensors start at 20 °C.
The table shows the time taken for each sensor to reach 40 °C.
| Distance of sensor from heated end in cm | Time taken to reach 40 °C in s |
|---|---|
| 2.0 | 12 |
| 4.0 | 27 |
| 6.0 | 46 |
Explain the pattern in the results. Your answer should include whether a sensor 8.0 cm from the heated end would reach 40 °C in less than or more than 46 seconds.
84 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.