10. 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: Sodium, silver, tin, Silicon are elements; calcium carbonate is a compound.
Sugar solution, Coal, air, and blood is a mixture.
Calcium carbonate, Methane, carbon dioxide is a compund.
An element consists of a single type of atoms. Here Sodium (Na), Silver (Ag), Tin (Sn). and Silicon (Si) are elements.
Soil: Soil is a mixture of mineral, water, sand and organic compounds.
Calcium carbonate: Calcium carbonate is a hard shiny compound having the formula of CaCO3. We also call them as limestone.
Tin: Tin is a metal having an elemental symbol as Sn.
Silicon: Silicon is a semiconductor from the carbon family. It has the elemental symbol of Si and finds its use in electronic chips.
Coal: Coal contains carbon and traces of water, sulphur and hydrogen.
Air: Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour and other gases.
Soap: A soap consist of salts of fatty acids. Soap manufacturers add other ingredients like perfume and colour to make it appealing.
Methane: Methane is the simplest hydrocarbon having chemical formula CH4.
Blood: Our blood contains various cells, minerals, water, salts, glucose etc.
Next: Question: 11: Which of the following are chemical changes?