Question

state the difference between physical and chemical change with example​

Answer 1

Answer:

In physical change no new substance is formed.

In chemical change new substance with new properties is formed.

PHYSICAL CHANGE is reversible.

CHEMICAL CHANGE is irreversible.

Eg of P.C. tearing of paper

melting of ice

Eg of C.C. burning of paper

rusting of iron

Answer 2

Answer:

PHYSICAL CHANGES

- The chemical composition of a substance does not change.

- Change is only in the state of matter and not in the chemical identity.

-Examples include- Vaporising of water and dissolution of sugar in water.

- Most changes are reversible.

- No new substances are formed. For example,

Ice → Water → Steam

 CHEMICAL CHANGES

- The chemical composition of a substance changes.

- Change is in chemical identity, but may or may not be in the state of matter.

- Examples include- Rusting of Iron, cooking of food etc.

- Most changes are irreversible.

- New substances are formed.For example,

methane → carbon dioxide and water