Physical vs chemical with atom inventory — the mirror pair
reaction lab - particle-model-and-equations - grade band 6-8
Reactionlab: First Reaction
Magnesium gains mass. Soda loses mass. Same law, opposite direction, one boundary lesson.
PredictTestExplainReviseDefendTransfer0/5 evidence steps
- room temp
station 1 - salt + water
salt beside water
station 2 - baking soda + vinegar
powder beside liquid
station 3 - magnesium in air
magnesium ribbon in open air
station 1 - salt + water
ledger
mass---
substances---
atoms---
energyobserve
station 2 - baking soda + vinegar
ledger
mass---
substances---
atoms---
energyobserve
station 3 - magnesium in air
ledger
mass---
substances---
atoms---
energyobserve
The inventory changed because the boundary is open. Atoms left (or arrived). Draw the boundary around everything involved.
No moves yet — predict before you stir.