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(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures ?
Write down the names of two elements, two compounds and two mixtures.
(b) Classify the following into elements, compounds and mixtures :
Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common slat, Sea-water, Chalk
(a) (i) An element is a substance that cannot be split up into two or more simpler substances by chemical methods. It contains only one type of atom. Examples of elements: Nonmetals: Carbon and oxygen.
Metals: Aluminum, iron, copper, gold, mercury, and lead.
(ii) A compound is a substance consisting of two or more elements combined chemically in a fixed proportion by mass.
Examples: Water, sodium chloride, calcium carbonate etc.
(iii) A mixture is a substance that is made up of two or more different kinds of particles or two or more pure substances mixed together by a physical process. Examples: Air, milk, wood, soil etc.
(b) Elements: Gold and Diamond
Compounds: Common salt and marble
Mixtures: Brass and seawater.
Updated on: 19-Jan-2023
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