质量守恒
Conservation of Mass
测量并提供证据，证明无论发生加热、冷却或混合等哪种变化，物质的总重量都保持不变。
Measure and provide evidence that the total weight of matter is conserved regardless of the type of change (heating, cooling, or mixing)
学习证据 / Evidence
- 说出物质在物理变化或化学变化中既不会凭空产生，也不会凭空消失的原理。
- 描述一个在变化前后称量材料重量以证明质量守恒的探究实验。
- 解释为什么溶解的糖虽然看不见，但仍然算在总重量里。
- State the principle that matter is neither created nor destroyed during physical or chemical changes
- Describe an investigation weighing materials before and after a change to show mass is conserved
- Explain why dissolved sugar still contributes to the total weight even though it can't be seen
评估问题 / Assessment
如果{{name}}把糖溶解在水里，能解释为什么水和糖的总重量保持不变，即使糖看起来消失了？
If {{name}} dissolves sugar in water, can they explain why the total weight of the water and sugar stays the same even though the sugar seems to disappear?