Question

How would you decide whether a change is physical or chemical?Mention two characteristics of each kind of change.

Answer 1

Answer:

If a new substance is formed then it is chemical change,but if no substance is formed then it'll be physical change.

Physical change: this change is reversible.

No new substance is formed

Chemical change:this change is irreversible.

New substance is formed.

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Answer 2

Answer:

physical change these changes are reversible example:melting of wax in this reaction no new products are formed

chemical change these changes are irreversible example:burning of paper in this reaction new products are formed