Example of Elements, Compounds and Mixtures

Based on the chemical composition of the substance, matter may be classified as elements, compounds or mixtures.
Example of Elements, Compounds and Mixtures
a) Elements: These are substances which cannot be reduced to simpler materials either by physical or chemical changes.  At present 118 different elements are known. About 92% of the elements can be extracted from natural sources but the rest are prepared from artificially by means of nuclear processes. Elements are represented by Symbols.
Example of elements: Copper (Cu), Oxygen (O), Hydrogen (H), helium (He), Lithium (Li)
b) Compound: A compound is a substance which contains two or more elements chemically combined together. Water is made up of hydrogen and oxygen atoms. Carbon dioxide is up of carbon and oxygen. Unlike elements , compounds can be decomposed, or broken down by simple chemical reactions. 
Water example of compound
Example of Compounds: Water (H2O), Salt (NaCl), Ammonia (NH3), Methane(CH4), Benzene (C6H6). Sugar(CHO)n, Sulphuric acid (H2SO4), Marble, Saltpetre
c)Mixture: When two or more substances are combined by physical methods in any proportion and no new substances is formed then it is called a mixture. 
Mixture is of two types: Homogeneous and heterogeneous.  Homogeneous mixtures have the same composition throughout. Heterogeneous mixtures have different composition in different parts of the mixture.
Sand example of mixture
Example of Mixtures: Sand, Air is mixture of gases, Sugar and water, Combination of sulphur, iron fillings. The constituents of a mixture can be separated by ordinary physical methods.
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