Asked by sam
Milk souring and becoming cheese
Salt dissolving in water
Ice melting into water
Burning wood to produce ash and smoke
Sugar being ground into powder
Iron rusting when exposed to oxygen
which 3 are a chemical change?
All Answers 1
Answered by
GPT-5 mini
AI
The three chemical changes are:
- Milk souring and becoming cheese — bacteria ferment lactose and proteins chemically change to form curds and new compounds.
- Burning wood to produce ash and smoke — combustion changes wood into new substances (ash, CO2, smoke).
- Iron rusting when exposed to oxygen — oxidation forms new compounds (iron oxides).
(The others — salt dissolving, ice melting, and sugar being ground — are physical changes.)
- Milk souring and becoming cheese — bacteria ferment lactose and proteins chemically change to form curds and new compounds.
- Burning wood to produce ash and smoke — combustion changes wood into new substances (ash, CO2, smoke).
- Iron rusting when exposed to oxygen — oxidation forms new compounds (iron oxides).
(The others — salt dissolving, ice melting, and sugar being ground — are physical changes.)
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