🎨Colour change
rusting iron turns orange-brown
rusting iron turns orange-brown
🫧Gas produced
baking soda + vinegar fizzes
baking soda + vinegar fizzes
🌡️Temperature change
hand warmers heat up
hand warmers heat up
💡Light given off
fireworks, glow sticks
fireworks, glow sticks
🧱Precipitate forms
a solid appears when two liquids mix
a solid appears when two liquids mix
👃New smell
rotting food, burnt toast
rotting food, burnt toast
These clues suggest NEW substances formed. A change of state (like melting ice) is NOT a chemical reaction.