A solid is heated from 0° to 100°C. Its volume increases from V 1 to V 2 . It is now cooled to 0°C. Will its volume at 0°C be V 1 or V 2 ?

At 0 ° C , the volume of the solid will be V 1 again. Note:- Thermal expansion is a physical change, which is a reversible change. Solid expands when temperature increases, and contracts when it decreases.

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Change in shape during a reaction is a chemical change.

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Important Questions on Physical and Chemical Changes

MEDIUM

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Which of the following are physical changes?

(a) Melting of iron metal (b) Rusting of iron

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

State whether a physical change is reversible or irreversible.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

A physical change is a _____ change.

(Clues- reversible, chemical, irreversible)

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

On heating, _____ process changes the state of matter.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

One of the following is not a physical property of a substance.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Tabulate differences between: Physical change and chemical change.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Is a physical change temporary or permanent?

MEDIUM

Science>Chemistry>Physical and Chemical Changes>Physical Changes

A change in the physical state is brought about

MEDIUM

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Sublimation is a _____ change.

MEDIUM

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Classify the following as chemical or physical changes:
(a) cutting of trees,
(b) melting of butter in a pan,
(c) rusting of almirah,
(d) boiling of water to form steam,
(e) passing of electric current, through water and the water breaking down into hydrogen and oxygen gases,
(f) dissolving common salt in water,
(g) making a fruit salad with raw fruits, and
(h) burning of paper and wood.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

A solid is heated from 0° to 100°C. Its volume increases from V₁ to V₂. It is now cooled to 0°C. Will its volume at 0°C be V₁ or V₂?

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Is a physical change reversible or irreversible change?

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

Define physical change.

EASY

Science>Chemistry>Physical and Chemical Changes>Physical Changes

A change that can be reversed by reversing the conditions.