Scenario 1 of 5
Score 0
Reason it backwards — was it chemical?
⟳ Physical
⚗ Chemical
Next scenario →
Sealed vs open — where does the mass go?
🔒 Sealed jar
🔓 Open jar
Take the
sign you noticed
and talk back to a verdict. Then flip the jar:
seal it
and the gases stay, so mass holds;
open it
and the gases escape, so the scales drop.