1.1. A student investigates how the pressure of a gas changes with temperature.

The student traps a fixed mass of air inside a flask connected to a pressure sensor.

The flask is placed in a water bath.

Table 1 shows the results obtained by the student.

Table 1

Give one control variable in this investigation.

1.2. Describe a method the student could use to obtain the results in Table 1.

You should include how the student could ensure the results are accurate.

1.3. One of the results in Table 1 is anomalous.

Identify the anomalous result.

1.4. Suggest two reasons why this anomalous result occurred.

1.5. Use the particle model to explain why the pressure of the gas increases as the temperature increases.