MEDIUM
7th ICSE
IMPORTANT
Earn 100

Is falling of leaves from a tree an irreversible change? Give reasons.

Important Questions on Physical and Chemical Changes

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III
Give three characteristics of physical changes.
HARD
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III
Give three characteristics of a chemical change.
MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III

Identify the change and state whether energy is absorbed or evolved.

Burning of paper.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III

Identify the change and state whether energy is absorbed or evolved.

Growth in plants.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III

Identify the change and state whether energy is absorbed or evolved.

Making of food by green leaves.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III

Identify the change and state whether energy is absorbed or evolved.

Lightning of an electric bulb.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III

Identify the change and state whether energy is absorbed or evolved.

Explosion of firecrackers.

MEDIUM
7th ICSE
IMPORTANT
Innovative Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATE YOUR UNDERSTANDING>Q III
Break a wooden splint into half. Break these pieces further into more smaller pieces.
(a) Are the smallest pieces that you have obtained still wood?
(b) Is this a physical or a chemical change? Why?