Science
Matter & Materials
Conceptual
9–10 yrs
Reversible Changes
可逆变化
Description
Demonstrate that dissolving, mixing, and changes of state are reversible changes where no new materials are formed
Mastery Evidence
- Define a reversible change as one where the original materials can be recovered
- Give at least three examples of reversible changes: melting, freezing, dissolving, evaporating
- Explain how to reverse each example (e.g. freeze melted chocolate, evaporate a solution)
Assessment Prompt
Can your child explain that melting chocolate or dissolving sugar can be undone — you can get the original material back — because these are reversible changes?
