condensation - sự ngưng tụ gas ->liquid, evaporation - sự bay hơi liquid -> gas, mixture of oil and water - hỗn hợp.  , why the salt is not separated from the water? - because the salt dissolves in the water. , soluble in water and insoluble? - tan trong nước = dissolve in water, the liquid that dissolves the solid - solute, boilling and evaporation differences? - it happens inside the liquid - boilling. it happens at the surface of the liquid. , the meaning of melting point? - the temperature the a solid changes into liquid. , when add salt into the water? - it increases the boilling point of water, freezing. state changes? - liquid to solid ,

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