Question

Classify the following as elements, compounds and mixtures.
Calcium oxide, salt solution, calcium metal, milk, nitrogen, sodium chloride, soda water, iron
oxide, sodium metal, alloys, copper sulphate, diamond, air, hydrogen, graphite, pond water.

Answer 1

Calcium oxide - compound

Salt solution - mixture

Calcium metal - element

Milk - mixture

Nitrogen - element

Sodium chloride - compound

Soda water - mixtures

Iron oxide - compound

Sodium metal - element

Alloys - mixture

Copper sulphate - compound

Diamond - element

Air - mixture

Hydrogen - element

Graphite - element

Pond water - mixture.

Answer 2

Elements : Nitrogen, hydrogen.

Compounds : Calcium Oxide,Salt Solution, Calcium metal,Sodium Chloride, Copper Sulphate,diamond graphite, Iron Oxide, Sodium metal alloys.

Mixture : Soda water,air, pond water.

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