Science at key stages 1 and 2 (Year 5)

Unit 5D: Changing state
Section 9: Boiling

Objectives

Children should learn:

that the boiling temperature of water is 100?C
to identify patterns in data and use these to make predictions
to decide whether the evidence collected supports the prediction and explain what happened in terms of scientific knowledge and understanding

Activities		Outcomes
		Children:
Show children a chart or graph of the temperature of a container of water as it is being heated eg temperature rising 5 degrees every minute from 20°C to 45°C and ask them to predict what the next five readings will be. Then show them similar results from 90°C and ask them to make similar predictions. Using an IT sensor (or a suitable thermometer), carry out the experiment and compare results with predictions or use results already obtained. Talk with the children about what the results show about boiling.		identify the pattern in data and use this to make predictions recognise that simply heating water at its boiling point will not result in it getting hotter state that the boiling temperature of water is 100°C

Points to note

In these activities the mixture may need to be stirred around the temperature sensor or thermometer. Pure water boils at 100°C. Many of the thermometers used in primary schools are not very accurate, especially if they are not immersed to the correct depth.

SAFETY - Take care with boiling water. Work with boiling water should be a teacher demonstration only and children should be kept well back.

SAFETY - Mercury thermometers are more accurate than spirit thermometers but less suitable for primary schools because of the problem of clearing up toxic mercury if they are broken.

Sections in this unit

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This unit is divided into sections. Each section contains a sequence of activities with related objectives and outcomes. You can view this unit by moving through the sections or print/download the whole unit.


	1. Introduction
	2. Water evaporation
	3. Evaporation of other liquids
	4. Planning to investigate evaporation
	5. Interpreting results on evaporation
	6. Drying and evaporation
	7. Condensation
	8. Finding condensation
	9. Boiling
	10. Observing melting
	11. Reversible changes of state
	12. The water cycle

Science at key stages 1 and 2 (Year 5)

Objectives

Activities

Outcomes

Points to note

Sections in this unit