EASY
9th CBSE
IMPORTANT
Earn 100

Define freezing

Important Questions on Matter in Our Surroundings

EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 13

Define condensation.

EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 14

Explain, why naphthalene balls kept in stored clothes in our homes disappear over a period of time?

EASY
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 15

How is ammonia gas liquefied?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 16

What is evaporation? In what way is it different from boiling?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 17

State the factors affecting evaporation.

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 18

How does evaporation cause cooling?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 19

How can the evaporation of a liquid be made faster?

MEDIUM
9th CBSE
IMPORTANT
Chemistry for Class IX>Chapter 1 - Matter in Our Surroundings>Exercise>Q 20

How does perspiration (or sweating) help to keep our body cool on a hot day?