An investigation into whether having the lid on or off affects the colour of green vegetables.
Should beans be cooked with the lid on or off?PDF, Size 76.64 kb
If you teach primary science, see the headings below to find out how to use this resource:
Children will develop their working scientifically skills by:
- Selecting and planning the most appropriate ways to answer science questions, recognising and controlling variables where necessary, including:
- Carrying out comparative tests.
- Drawing conclusions and raising further questions that could be investigated, based on their data and observations.
- Using appropriate scientific language and ideas to explain, evaluate and communicate their methods and findings.
- Observe that some materials change state when they are heated or cooled, and measure or research the temperature at which this happens in degrees Celsius.
Children will learn:
- The temperature at which water boils.
- That irreversible chemical changes occur when food is cooked.
Suggested activity use
Due to the need to use boiling water, this activity is best carried out as class demonstration, or by small groups of children being closely supervised by an adult.
It is important to ask children how they could test whether cooking green vegetables with the lid on or off makes any difference to their colour, and to discuss their ideas before being shown the test samples to observe.
To carry out this activity you will require access to a cooker or hob to boil the water.
You should be very careful with boiling water around children, and a risk assessment and other health and safety considerations should be carried out.
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