Science
Matter & Materials
Conceptual
9–11 yrs
Irreversible Changes
不可逆变化
Description
Explain that some changes result in the formation of new materials and are not usually reversible, such as burning, rusting, and reactions with acid
Mastery Evidence
- 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
Assessment Prompt
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?
Prerequisites 1
Reversible Changes
必须先理解可逆变化，再与不可逆变化进行对比
