Write the chemical symbol for Sulphur.

Important Questions on Chemicals and Chemical Changes

EASY

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 2

Write the chemical symbol for Phosphorus.

EASY

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 4

Write the chemical symbol for Aluminium.

HARD

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 1

Differentiate between an element, a compound, and a mixture. Give atleast one relevant example for each.

MEDIUM

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 2

What is atomicity? Give one example each for monoatomic, diatomic and tetra atomic elements.

HARD

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 3

Name all the elements present in the following compounds: ${\mathrm{SO}}_2, {\mathrm{PbCl}}_2, \mathrm{Ba}{\left(\mathrm{OH}\right)}_2, \mathrm{LiF}$.

MEDIUM

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 4

Why do the cut surfaces of fruits and vegetables turn brown?

MEDIUM

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 5

Write a short note on crystallization.

HARD

7th CBSE

IMPORTANT

NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q 1

Explain the process used for removing impurities from common salt.