Which one is a physical or chemical change?
Wood burns to ashes.
Water boils.
Grass Grows.
A rock is crushed to powder.
Answer:
A physical change is when substance's change from one state (gas, liquid, solid) to another without alteration of the chemical composition
A chemical change is when the chemical composition changes.
Grape Juice to wine is a fermentation process where sugar carbon chains are broken apart and made into alcohols. The process is a chemical change. C-C-Cn -> C-C-OH
Wood burning to ashes is a chemical change where wood fiber carbon chains are changed to carbon gases. C-C-Cn -> CO
Water boiling is the water tuning to vapor in a physical change. H2O(liquid) -> H2O(gas)
Grass Growing is a chemical change, the opposite of wood burning where CO2 from the air is bonded to make Carbon chains in the grass fibers. CO2 -> C-C-Cn
Rock crushing to powder is a physical change. The properties of the solid rock are reduced to smaller pieces. No chemical changing of the rock takes place.
First is chemical. Fermentation of grape juice to turn to wine.
Second Chemical. Fire exhausts all oxygen in wood to burn.
Third Physical water to vapor.
Fourth Chemical. Grass using nutrients in the soil and sunlight to replenish itself.
Fifth is Physical . Rock is just crushed to much smaller particles of rock.
1- Chemical change
2- chemical change
3- physical change
4- Chemical change
5- physical change
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