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Classify the following into elements, compounds and mixtures.
(a) Sodium

(b) Soil

(c) Sugar solution

(d) Silver

(e) Calcium carbonate

(f) Tin

(g) Silicon

(h) Coal

(i) Air

(j) Soap

(k) Methane

(l) Carbon dioxide

(m) Blood.

Answer :

Elements: Sodium, Silver, Tin, silicon.

Compounds: Calcium carbonate, Carbon dioxide, Methane.

Mixture: Soil, Sugar solution, coal, air, blood, soap.


An element is a pure substance consisting only of atoms that have the same numbers of protons in their atomic nuclei. Elements cannot be broken down into simpler substances by any chemical means.

A compound is a substance formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary which are covalent bonds and ionic bonds. The elements are always present in fixed ratios in any compound.

A mixture is made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

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