Pure and Impure substances.
When two pure substances are mixed together they form a mixture.
A mixture is an impure substance. Therefore, a pure substance is any material that is not a mixture at all.
The melting and boiling points of pure and impure substances can be determined.
Melting point of pure substances (Ice).
It is the temperature at which a solid change into liquid state.
The melting point of ice is the temperature at which ice is converted from its solid state to its liquid state.
Heat from a heat source is used to melt the ice.
The thermometer helps to note the temperature at which the ice melts.
After the initial and final readings are taken, it will be observed that once the ice attained its melting temperature (0oC), the temperature remains the same until all the ice is converted into liquid state.
Pure solids have specific melting points. Therefore, it means that ice is a pure substance.
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