Question
If the statement represents a PHYSICAL CHANGE please circle it in PURPLE.
If the statement represents a CHEMICAL CHANGE please circle it in ORANGE.
Release or absorb heat Can be undone Fireworks Exploding Candle Burning
Ice Melting Paper Ripping Wood Burning Cannot be undone
State of Matter Change Cutting Hair Cutting an Apple Baking a Cake
A Precipitate may form Boiling Water Rotting Fruit Digesting Food
Rusting Nail Frying an Egg Condensation on Can Breaking a Pencil
If the statement represents a CHEMICAL CHANGE please circle it in ORANGE.
Release or absorb heat Can be undone Fireworks Exploding Candle Burning
Ice Melting Paper Ripping Wood Burning Cannot be undone
State of Matter Change Cutting Hair Cutting an Apple Baking a Cake
A Precipitate may form Boiling Water Rotting Fruit Digesting Food
Rusting Nail Frying an Egg Condensation on Can Breaking a Pencil
Answers
GPT-5 mini
I'll mark each statement as PHYSICAL (circle in PURPLE) or CHEMICAL (circle in ORANGE) and give a brief reason.
- Release or absorb heat — CHEMICAL (circle ORANGE). Often a sign of chemical reactions (exothermic/endothermic).
- Can be undone — PHYSICAL (circle PURPLE). Physical changes are often reversible.
- Fireworks exploding — CHEMICAL (circle ORANGE). Combustion/explosion produces new substances and light.
- Candle burning — CHEMICAL (circle ORANGE). Combustion of wax produces new gases and heat.
- Ice melting — PHYSICAL (circle PURPLE). Phase change, no new substance formed.
- Paper ripping — PHYSICAL (circle PURPLE). Only physical separation of material.
- Wood burning — CHEMICAL (circle ORANGE). Combustion produces ash, gases — new substances.
- Cannot be undone — CHEMICAL (circle ORANGE). Chemical changes are often irreversible.
- State of matter change — PHYSICAL (circle PURPLE). Phase changes are physical.
- Cutting hair — PHYSICAL (circle PURPLE). Only changes shape/length, not composition.
- Cutting an apple — PHYSICAL (circle PURPLE). Physical separation (though browning afterwards is chemical).
- Baking a cake — CHEMICAL (circle ORANGE). New substances form (chemical reactions during baking).
- A precipitate may form — CHEMICAL (circle ORANGE). Formation of a new solid from solution is a chemical change.
- Boiling water — PHYSICAL (circle PURPLE). Phase change (liquid to gas) only.
- Rotting fruit — CHEMICAL (circle ORANGE). Decomposition produces new substances.
- Digesting food — CHEMICAL (circle ORANGE). Enzymatic reactions break and rearrange molecules.
- Rusting nail — CHEMICAL (circle ORANGE). Oxidation produces new compound (iron oxide).
- Frying an egg — CHEMICAL (circle ORANGE). Proteins denature and react; new structure/substances form.
- Condensation on can — PHYSICAL (circle PURPLE). Gas to liquid phase change on surface.
- Breaking a pencil — PHYSICAL (circle PURPLE). Mechanical break; no new substances.
- Release or absorb heat — CHEMICAL (circle ORANGE). Often a sign of chemical reactions (exothermic/endothermic).
- Can be undone — PHYSICAL (circle PURPLE). Physical changes are often reversible.
- Fireworks exploding — CHEMICAL (circle ORANGE). Combustion/explosion produces new substances and light.
- Candle burning — CHEMICAL (circle ORANGE). Combustion of wax produces new gases and heat.
- Ice melting — PHYSICAL (circle PURPLE). Phase change, no new substance formed.
- Paper ripping — PHYSICAL (circle PURPLE). Only physical separation of material.
- Wood burning — CHEMICAL (circle ORANGE). Combustion produces ash, gases — new substances.
- Cannot be undone — CHEMICAL (circle ORANGE). Chemical changes are often irreversible.
- State of matter change — PHYSICAL (circle PURPLE). Phase changes are physical.
- Cutting hair — PHYSICAL (circle PURPLE). Only changes shape/length, not composition.
- Cutting an apple — PHYSICAL (circle PURPLE). Physical separation (though browning afterwards is chemical).
- Baking a cake — CHEMICAL (circle ORANGE). New substances form (chemical reactions during baking).
- A precipitate may form — CHEMICAL (circle ORANGE). Formation of a new solid from solution is a chemical change.
- Boiling water — PHYSICAL (circle PURPLE). Phase change (liquid to gas) only.
- Rotting fruit — CHEMICAL (circle ORANGE). Decomposition produces new substances.
- Digesting food — CHEMICAL (circle ORANGE). Enzymatic reactions break and rearrange molecules.
- Rusting nail — CHEMICAL (circle ORANGE). Oxidation produces new compound (iron oxide).
- Frying an egg — CHEMICAL (circle ORANGE). Proteins denature and react; new structure/substances form.
- Condensation on can — PHYSICAL (circle PURPLE). Gas to liquid phase change on surface.
- Breaking a pencil — PHYSICAL (circle PURPLE). Mechanical break; no new substances.