What does a chemical equation represent?

Important Questions on Chemical Substances and Processes

EASY

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 6

What are reactants and products in a chemical equation?

EASY

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 7

Give one example of a combination reaction.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 1

Write the steps involved in writing the chemical formula of calcium phosphate.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 2

How is a chemical change different from a physical change?

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 3

Neutralisation reaction is a chemical change: Justify this statement with the help of an example.

MEDIUM

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 4

Define a decomposition reaction and give an example of the same.

EASY

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 5

Classify the following reactions into different types, giving reason: $\mathrm{CaO} \left(\mathrm{s}\right)+{\mathrm{SiO}}_2 \left(\mathrm{g}\right)\to {\mathrm{CaSiO}}_3 \left(\mathrm{s}\right)$.

EASY

7th CBSE

IMPORTANT

The Living World A book of Science and Technology>Chapter 3 - Chemical Substances and Processes>Something To Know>Q 5

Classify the following reactions into different types, giving reason: $\mathrm{KOH} \left(\mathrm{aq}\right)+\mathrm{HCl} \left(\mathrm{aq}\right)\to \mathrm{KCl} \left(\mathrm{aq}\right)+{\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right)$.