MEDIUM
7th CBSE
IMPORTANT
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When will two elements on being mixed together form a compound? 

Important Questions on Structure of Matter

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q C
Why are the properties of different compounds so different from each other? 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q C
Why are most elements not found in the free state in nature?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q C
How can you form iron sulphide from a mixture of iron and sulphur?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q C
What does a formula represent?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q C
Define valency in terms of hydrogen.
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