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Heating water

Assessment focuses: AF1, AF4, AF5

Context

As part of work considering changes of state and associated particle arrangements, pupils monitored the heating of water from room temperature to boiling point. Pupil H initially carried out the experiment using a thermometer and stopwatch and got poor results. He then attempted it with a data-logger and obtained the improved results shown here.

As a class, the pupils compared their results and considered what they might see when other substances were heated or cooled.

Pupils then annotated their graphs without access to secondary sources.

Pupil's work

Illustration of a time versus temperature graph

The graph depicts time on the X axis and temperature on the Y axis. The graph also shows that there is steady rise in movement of water particles as the temperature rises. However, after a certain point the movement of the water particle stands at a steady rate with the rise in temperature.

Illustration of a time versus temperature graph

The graph depicts time on the X axis and temperature on the Y axis. The graph depicts the state of water particles as it is heated.

Pupil H explained that he decided to use the data-logger because it would provide ‘continuous measurement’. He chose to sketch an additional graph and used this as a basis for predicting the shape of the graph that would be obtained if the initial temperature were 10°C and the water were heated until it evaporated.