Write the characteristics of a chemical change.

Important Questions on Chemicals and Chemical Changes

MEDIUM

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q E

What are the differences between atoms and molecules.

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q E

The process of freezing is an example of a physical change even though water and ice have different properties. Why?

MEDIUM

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q E

How are compounds different from mixtures?

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q E

How does the soaking of the cut pieces of vegetables and fruits in water reduce the level of browning?

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q F

Distinguish between chemical changes and physical changes.

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q F

What are the steps involved in balancing a chemical equation? Explain with examples.

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q F

Why is it important to know the valency of elements?

HARD

7th CBSE

IMPORTANT

Science Now 7>Chapter 4 - Chemicals and Chemical Changes>EXERCISE>Q F

Distinguish between symbols, chemical formulae and chemical equations.