EASY
9th ICSE
IMPORTANT
Earn 100

Give an example of a reaction in which water acts as a catalyst.

Important Questions on Chemical Changes and Reactions

MEDIUM
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 14

Define exothermic and endothermic changes. Give two examples of each.

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 15
State the effect of an endothermic reaction and an exothermic reaction on the surroundings.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 16

Define:

Photochemical reaction

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 16

Define:

Electrochemical reaction. Give one example of each.

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 17
The process of a liquid changing into a solid is called _____.
EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 17

Complete the following statements by using proper words:

The temperature at which a solid changes into a liquid is called _____.

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 17

Complete the following statement by using proper word:

The process of a solid changing directly into a gas is called _____.

EASY
9th ICSE
IMPORTANT
S. Chand's ICSE CHEMISTRY Book -1 CLASS- 9>Chapter 2 - Chemical Changes and Reactions>Questions>Q 17

Complete the following statements by using proper words:

A change which alters the composition of a substance is known as a  _____ change.