MEDIUM
7th CBSE
IMPORTANT
Earn 100

Define valency in terms of hydrogen.

Important Questions on Structure of Matter

HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D
Explain the differences between an element and a compound. Give examples. 
HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D
Explain the difference between the atom and the molecule of an element. Can a molecule of an element be the same as its atom? Give an example. 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D

Write the formula of the following compound, showing the steps involved.

a. Sodium oxide 

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D

Write the formula of the following compound, showing the steps involved.

b. Magnesium nitrate

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D

Write the formula of the following compound, showing the steps involved.

c. Magnesium sulphate

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D

Write the formula of the following compound, showing the steps involved.

a. Aluminium chloride

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D
What is a chemical equation? Why is it necessary to balance an equation?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q D

Balance the following equations.

Mg+H2SO4→MgSO4+H2