Question

four differences between physical changes and permanent chemical change

Answer 1

Answer:

~in physical change no new substance is formed.

~in chemical change new substance is formed .

~physical change is reversible change.

~chemical change is irreversible change.

~physical change eg - streching of rubber band.

~chemical change eg - boiling of egg .

Answer 2

✍️Physical change 1.No new substances with new properties are formed.

✍️Chemical change 1. New substance with new properties are formed.

✍️physical change 2. It can be reversed by simple physical methods.

✍️Chemical change 2. Change cannot be reversed by simple physical methods.

✍️Physical change 3. It is temporary change.

✍️chemical change 3. It is permanent change.

✍️physical change 4. Energy is neither needed nor produced.

✍️chemical change 4. Energy is either needed or evolved.