Learning objectives

Knowledge

  • To demonstrate irreversible changes.

Working scientifically

  • To analyse observations about rusting and use them to support a conclusion.

Success criteria

Knowledge

  • I can define

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National curriculum

Science

Properties and changes

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Before the lesson

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Lesson plan

Recap and recall

Display the Presentation: Agree or disagree? and select a volunteer to read each statement aloud. Arrange the pupils into pairs and instruct them to discuss whether they agree or disagree with each statement. Explain that they should justify their decisions using learning from previous lessons.

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Adaptive teaching

Pupils needing extra support

Could focus on recording how easily each material ignited on the Activity: Observing burning; could use the Knowledge organiser to help them analyse the statements in the Recap and recall and answer the questions in the Attention grabber; should read the information under the video at the link: Irreversible changes instead of the Wrapping up activity.

Pupils working at greater depth

Should write their conclusion to the rusting experiment independently; should time how long each material burnt for and record this in the last column of the table on the Activity: Observing burning; could choose an extension activity relating to reversible and irreversible changes from the Resource: Stretch and challenge: Properties and changes.

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Assessing progress and understanding

Pupils with secure understanding indicated by: defining the

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Knowledge outcomes

  • I can define the term irreversible change as when a material undergoes a change that cannot be easily reversed and which produces a new material or materials.
  • I can identify rusting as an irreversible change and describe the conditions required (water and air/oxygen).
  • I can identify burning as an irreversible change and describe the differences between how some different materials burn. 

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Vocabulary definitions

  • burning

    An irreversible change in which a material burns to make new products.

  • irreversible change

    When a material undergoes a change that cannot be easily undone and which produces a new material.

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