Question

1. Define :
(a) a physical change
(b) a chemical change​

Answer 1

Answer:

1. Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. ... Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
2. A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed. It results when a substance combines with another to form a new substance (synthesis or either decomposes to form more substances).

Answer 2

Answer:

Physical Change- The change which is reversible and no new substance/s is/are formed .example- melting of wax

Chemical Change- The change which is irreversible and new substance/s is/are formed .example - burning of paper or coal.

Explanation:

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