Question

Please differenciate between irreversible physical change, physical change and chemical change in your own words and make it understandable.

Answer 1

PHYSICAL CHANGE
physical change is any change in which no reactants or substances are decomposed during the reaction or change . (same as reversible change)
eg: melting of ice .

REVERSIBLE CHANGE((((this term is used by 5th or 6th grade students ))))
this is the same as physical change where the reaction or process can be reversed because no product is decomposed .(same as physical change)
eg: melting of ice .here ,the melted ice and again be freezed back to its normal form .

CHEMICAL CHANGE
it is that the change in which a new product is formed or the existing substances are decomposed .same as irreversible change .eg: burning of paper .here the paper is completely burnt and decomposed to ashes (carbon)

IRREVERSIBLE CHANGE
a change which cannot be reversed because substances involved in change are decomposed . same as chemical change

Answer 2

hey
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physical change
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a change in which shape , size of substance changes

can be reversed

no new substance is formed

very little heat light energy is usually absorbed or given out

mass of a substance doesnot doesnot alter in a physical change

eg - rolling of roti

chemical change
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change of shape size of substance doesnot changes

cannot be reversed

new substance is formed

a lot of heat energy is absorbed or given out

mass of a substances does alter

eg - baking of roti

hope helped
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