Define galvanisation.

Important Questions on Physical and Chemical Changes

HARD

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 1

Why does stainless steel not rust?

MEDIUM

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 2

Define rusting. Write some methods to prevent rusting?

HARD

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 3

Test the presence of carbon dioxide with a chemical reaction.

MEDIUM

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 4

What is crystallisation?

HARD

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>SUMMATIVE ASSESSMENT>Q 5

Explain how we can obtain pure and large crystals of copper sulphate from an impure solution.

EASY

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>FORMATIVE ASSESSMENT>Q 1

Name the properties such as size, shape, colour.

EASY

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>FORMATIVE ASSESSMENT>Q 2

Chemical changes are also known as chemical _____.

EASY

7th CBSE

IMPORTANT

Interactive Science 7>Chapter 6 - Physical and Chemical Changes>FORMATIVE ASSESSMENT>Q 3

Name the process in which plants absorb ${\mathrm{C}\mathrm{O}}_2$ and release oxygen.