Question

Q1. How are changes classified as physical or chemical?​

Answer 1

Answer:

Changes are classified as physical or chemical by following:

Explanation:

(a) Photosynthesis - Chemical change

(b) Dissolving sugar in water - Physical change

(c) Burning of coal - Chemical change

(d) Melting of wax - Physical change

(e) Beating aluminium to make aluminium foil - Physical change

(f ) Digestion of food - Physical change

Answer 2

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Chemists make a distinction between two different types of changes that they study — physical changes and chemical changes.

• Physical changes are changes that do not alter the identity of a substance.
• Chemical changes are changes that occur when one substance is turned into another substance.