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

(a) Element.

As it is a pure substance consists of one kind of atom.

(b) Mixture.

As soil is made up of more than one kind of substances.

(c) Mixture.

As sugar solution is made up of two substances water and sugar.

(d) Element.

As it is a pure substance made up of silver atom only.

(e) Compound.

As in calcium carbonate, calcium, carbon and oxygen chemically combined with each other to form calcium carbonate and they cannot be separated by any physical process.

(f) Element.

As tin is a pure substance made up of tin atoms only.

(g) Element.

Silicon is a pure substance made up of Silicon atom only.

(h) Element.

Coal is an allotrope of carbon and is made up of carbon atom only.

(i) Mixture.

Air is made up of different gases like nitrogen, oxygen, carbondioxide etc. water vapors, dust particle and many other substances. All the constituents retain their property in air as they are only mixed with each other.

(j) Compound.

soap is made up of different fatty acid salts and sodium/potassium ions. These substances chemically combined with each other to obtain soap and they cannot be separated easily.

(k) compound.

Since Carbon and hydrogen chemically combined with each other to form methane in a fixed proportion ( 1:4 ratio).

(l) Compound.

It is a compound because when coal (carbon) is burnt in air it reacts with aerial oxygen to form carbondioxide. Carbon and oxygen can’t be separated easily from carbondioxide.

(m) mixture.

blood is a mixture of many chemical compounds including cells and many biological compounds which can be separated mechanically.