Differentiate between pure and impure substances.

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Pure Substances
Impure substances.
1. Substances that are made of just one ingredient in a pure element or compound; no additional substances are present. 1. Made up of different elements, compounds, or elements plus compounds.
2. Chemical and physical properties remain the same. 2. Chemical properties may be the same or vary.
3. They have a sharp melting point. 3. They melt over a range of temperatures.
4. They have a sharp melting point. 4. They boil over a range of temperatures.
5. Examples are pure water, hydrogen gas, gold etc. 5. Examples are muddy water, salt in water etc.

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Pure Substances	Impure substances.
1. Substances that are made of just one ingredient in a pure element or compound; no additional substances are present.	1. Made up of different elements, compounds, or elements plus compounds.
2. Chemical and physical properties remain the same.	2. Chemical properties may be the same or vary.
3. They have a sharp melting point.	3. They melt over a range of temperatures.
4. They have a sharp melting point.	4. They boil over a range of temperatures.
5. Examples are pure water, hydrogen gas, gold etc.	5. Examples are muddy water, salt in water etc.