Learning objectives

Knowledge​​

  • To describe melting and freezing.

Working scientifically

  • To use thermometers to take accurate measurements before and after melting.

Success criteria

Knowledge​​

  • I can describe the conditions needed for melting

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National curriculum

Science

States of matter

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Before the lesson

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Lesson plan

Recap and recall

Display slide 1 of the Presentation: Properties of the states of matter, which shows some dry flour and some water.

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Adaptive teaching

Pupils needing extra support

Could investigate melting using real ice cubes (easier to observe melting) and only hot and cold water, allowing for less data collection; could use the Knowledge organiser to help support writing a conclusion and answering the video questions.

Pupils working at greater depth

Should be provided with a list of materials (a hot water bottle, thermometer, foil cake cases, butter, chocolate, ice and an iron nail) to discuss and plan (on a whiteboard) how to compare the melting points of the different materials; could choose an extension activity relating to melting and freezing from the Resource: Stretch and challenge: States of matter.

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Assessing progress and understanding

Pupils with secure understanding indicated by: describing the conditions needed for melting

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Knowledge outcomes

  • I can describe the conditions needed for melting (heating above the melting point of the material) and freezing (cooling below the freezing point of the material).
  • I can describe the property changes as a material melts from having a fixed shape to flowing and taking the shape of its container.
  • I can describe the property changes as a material freezes, from flowing and taking the shape of its container to having a fixed shape.
  • I can name the start and end states when materials melt (solid to liquid).
  • I can name the start and end states when materials freeze (liquid to solid).

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Vocabulary definitions

  • freezing

    The process of a liquid changing into a solid.

  • freezing point

    The temperature at which a material freezes.

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