可逆变化
Reversible Changes
说明溶解、混合和状态变化都是可逆变化，不会生成新的物质
Demonstrate that dissolving, mixing, and changes of state are reversible changes where no new materials are formed
学习证据 / Evidence
- 将可逆变化定义为可以恢复原始材料的变化
- 给出至少三个可逆变化的例子：融化、结冰、溶解、蒸发
- 解释如何逆转每个例子（例如让融化的巧克力重新结冰、让溶液蒸发）
- 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)
评估问题 / Assessment
{{name}}能解释巧克力的融化或糖的溶解是可以逆转的——你能找回原来的材料——因为这些是可逆变化吗？
Can {{name}} explain that melting chocolate or dissolving sugar can be undone — you can get the original material back — because these are reversible changes?