Science Matter & Materials Conceptual 10–11 yrs

Conservation of Mass

质量守恒

Description

Measure and provide evidence that the total weight of matter is conserved regardless of the type of change (heating, cooling, or mixing)

Mastery Evidence
  • ✓ 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
Assessment Prompt

If your child 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?

Prerequisites 3
Irreversible Changes
科学 · 9–11y
必须先理解不可逆变化，才能证明所有类型变化中质量守恒
Reversible Changes
科学 · 9–10y
必须先理解可逆变化，才能探究变化过程中的质量守恒
Matter Is Made of Particles
科学 · 10–11y
粒子模型有助于理解质量守恒的原因（粒子不会被消灭）
Unlocks 1
Physical vs Chemical Changes
科学 · 11–13y