ICSE Class 9 Answered
Expert Answer
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Distillation |
Fractional distillation |
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This method is used for the separation of components of a mixture containing two miscible liquids which boil without decomposition and have a sufficient difference in their boiling points. |
This method is used for the separation of a mixture containing two miscible liquids, for which the difference in their boiling points is less than 25oC. |
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Example: Separation of a mixture of acetone and water.
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Example: Separation of a mixture of benzene and toluene.
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2.Elements and Compounds:
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Element |
Compound |
| It is a pure substance which cannot be converted into simpler substances by any physical or chemical means. | Properties of compounds are different from their constituent elements. |
It is made up of only one kind of atoms.
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It is made up of two or more different kinds of atoms. |
| Elements cannot be broken down into two or more simpler substances by any physical or chemical means. |
A compound can be divided into simpler substances only by chemical means. |
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Elements have their own set of properties |
Properties of compounds are different from their constituent elements.
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Example: Iron is grey coloured and attracted by a magnet. Sulphur is yellow coloured and soluble in carbon disulphid |
Example:
Iron sulphide is a black substance which is not attracted by a magnet and insoluble in carbon disulphide. While its constituent elements,Iron is grey coloured and attracted by a magnet. |
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