Irreversible Changes
Explain that some changes result in the formation of new materials and are not usually reversible, such as burning, rusting, and reactions with acid
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“Can your child explain why you can't un-burn a piece of toast or turn rust back into shiny iron, because a completely new material has been made?”
Full guide and materials
- Activity. Explain that some changes result in the formation of new materials and are not usually reversible, such as burning, rusting, and reactions with acid
What to notice. Define an irreversible change as one that creates new materials that cannot be changed back • Give at least three examples: burning, rusting, mixing bicarbonate of soda with vinegar • Describe observable signs of irreversible change: gas produced, colour change, heat given off, new substance formed
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Can your child explain why you can't un-burn a piece of toast or turn rust back into shiny iron, because a completely new material has been made?
Explain that some changes result in the formation of new materials and are not usually reversible, such as burning, rusting, and reactions with acid
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Check understanding
- Define an irreversible change as one that creates new materials that cannot be changed back
- Give at least three examples: burning, rusting, mixing bicarbonate of soda with vinegar
- Describe observable signs of irreversible change: gas produced, colour change, heat given off, new substance formed
“Can your child explain why you can't un-burn a piece of toast or turn rust back into shiny iron, because a completely new material has been made?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- Matter & Materials
- Age range
- Ages 9–11
Standards