Q1- Is air around us a compound or mixture ?
Q2 - water is a compound . Justify ?
Q3 - classify the following as element , compound and mixture : iron, sea water , milk ?
Q4 - Are naturally occurring material in nature chemically pure substances ?

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Solution

Dear Student,
1. air around us is a mixture of gases
2. Water is a compound because it contains H and O in a fixed ratio of 2:1 and also the compound H₂O shows properties different from constituent elements H and O.
3.Iron - element
Sea water - mixture
Milk - mixture
4.No, the naturally occurring material around us in not chemically pure substance because the air around us is a mixture of gases , sea water is mixture of ions , salts and water
Regards!

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Classify the following substances into compounds and mixtures :

Carbon dioxide, air, water, milk, common salt, blood, fruit juice, iron sulphide.

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1. Water is a mixture.

2. Milk is a compound.

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