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| Summary
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Matter - anything which has mass, occupies space and can be perceived by our senses.
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Law of conservation of matter - matter can neither be created nor destroyed.
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The states of matter are solid, liquid gas, plasma and super cooled solid.
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The three main states of matter are solid, liquid and gas
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Solids are rigid with minimum intermolecular spaces and maximum intermolecular attraction.
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Liquids have lower density than solids because the molecules are more loosely packed with larger inter-molecular spaces.
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Gases have extremely low density and rigidity with very loosely packed molecules.
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There is an attractive force existing between the molecules in all states of matter.
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Gases are highly compressible as compared to liquids and solids.
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Matter can be inter-converted from one state to the other by the addition or removal of heat energy.
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Certain substances change directly into the gaseous state without passing through the liquid state on heating. This process is called sublimation.
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Boiling point of a liquid is the temperature at which a liquid changes into its vapour. It depends on the external pressure and the presence of impurities in the liquid.
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Melting point is the temperature at which a solid changes into a liquid.
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Evaporation is a surface phenomenon of liquid changing into vapour that causes cooling.
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