ICSE Class 7 Chemistry
Question 1 of 16
Elements, Compounds and Mixtures — Question 1
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Question Question 1
Differentiate between the terms elements, compounds & mixtures with suitable examples.
Elements, compounds and mixtures can be differentiated as below:
| Elements | Compounds | Mixtures |
|---|---|---|
| Pure 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 |
| Elements 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. |
| Elements have a definite set of properties. Elements are classified into metals & non-metals each with its own properties | Compounds have a definite 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. |
| Elements 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. |
| Example: Metal : Iron, copper, silver, gold Non-metal: sulphur, chlorine | Example: Iron sulphide, copper oxide | Example: Iron + sulphur, Sodium chloride + water |