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ICSE Class 7 Chemistry Question 9 of 16

Elements, Compounds and Mixtures — Question 14

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Question 14

State four differences between - elements, compounds & mixtures with suitable examples.

Answer
S.
No.		PropertiesElementsCompoundsMixtures
1.TermPure substance made up of one kind of atoms only.

E.g., Iron [Fe], Sulphur [S]		Pure substance made up of two or more elements.

E.g., Iron Sulphide [FeS]		Impure substance made up of two or more elements or compounds.

E.g., Iron Sulphur mixture
2.ExistenceElements i.e., atoms of one kind are present on their own.

E.g., Iron & sulphur exist on their own as elements – iron & sulphur		Components in a compound are present in a definite proportion.

E.g., Iron and Sulphur are chemically combined in a fixed ratio in iron sulphide		Components in a mixture present in any proportion.

E.g., Iron and sulphur are mixed in any ratio in the mixture of iron and sulphur.
3.PropertiesElements have a definite set of properties.

Elements classified into metals & non-metal each with its own properties		Compounds have a different set of properties.

Elements of a compound do not retain their original properties.		Mixtures do not have a definite set of properties.

Components of a mixture do retain their original properties.
4.SeparationElements occur on their own or as compounds & can be separated by -chemical & physical methods.Elements in a compound are chemically combined and can be separated by chemical methods only.Components in a mixture can be separated by physical methods only.