Learning objectives
Knowledge
- To identify which factors affect the time taken to dissolve.
Working scientifically
- To plan a fair test with consideration of variables and measurements.
Success criteria
Knowledge
- I can recall
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National curriculum
Science
Properties and changes
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Cross-curricular links
British values
- Mutual respect
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Before the lesson
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Lesson plan
Recap and recall
Soluble dyes Gather the paper plate, jug of warm water and rainbow sweets (or small chocolate eggs) for the demonstration. Place the sweets in a circle around the edge of the plate, alternating colours. Pour the warm water onto the centre of the plate until it reaches the sweets. Allow the children to observe what…
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Adaptive teaching
Pupils needing extra support
Should answer the multiple choice questions on the Activity: Factors affecting dissolving instead of writing notes on the Pupil video: Factors affecting dissolving; could use the clues (equipment) under the tea towel to help with identifying the variables when planning their investigation; could be provided with a list of variables to choose from (see slide 4 of the Presentation: Planning an investigation).
Pupils working at greater depth
Should gather repeat data and measure the temperature of the water using a thermometer; should consider whether their test is fair (the temperature for all three cold, warm and hot water tests would need to be the same to make the test fair); could choose an extension activity relating to dissolving or solutions from the Resource: Stretch and challenge: Mixtures and separation.
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Assessing progress and understanding
Pupils with secure understanding indicated by: listing factors that affect
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Knowledge outcomes
- I can recall some factors that affect dissolving (including temperature, stirring, size of substance, type of substance and type of liquid).
- I can describe the effect of temperature on the time it takes for the substance to dissolve (the higher the temperature, the faster the substance dissolves).
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Vocabulary definitions
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control variable
A variable that needs to be kept the same.
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stopwatch
A piece of equipment used to measure time.
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In this unit
Maintained by: Kapow Primary team
Last update: 14th October, 2024
