What is an alloy?

Important Questions on Physical and Chemical Changes

MEDIUM

7th CBSE

IMPORTANT

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

Give two changes produced by chemical reactions.

MEDIUM

7th CBSE

IMPORTANT

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

Differentiate between endothermic and exothermic reactions.

MEDIUM

7th CBSE

IMPORTANT

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

Define galvanisation.

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.