Question

Classify the substances given below into Elements ,Compounds and Mixtures: Copper, NaCl,Wood,CaCO3,Lead,Tap water,

Answer 1

Most of these elements are found combined with other elements as compounds. Minerals are elements or compounds that occur naturally in the Earth's crust. Rocks are mixtures formed of minerals. Just as elements are the building blocks of minerals, so minerals form the building blocks of rocks.

Answer 2

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1. Copper - Element

2. NaCl - Compound

3. Wood - Wood

4. CaCO3 - Compound

5. Lead - Mixture

6. Tap water - Compounds

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Element - An element is the basic form of the matter that cannot be broken down into substance by chemical reactions.

• Example - Iron, Copper, Silver, Oxygen, Nitrogen and hydrogen etc.

Mixture - A mixture contains more than one substances.

• Example - Sea water, Air, soil etc.

Compound - A compound is a substance that is formed by the combination of two or more element in a fixed ratio by mass.

• Example - Water, Acid, Sodium chloride, Methane etc.