State four difference between compounds and mixtures.
|1. A compound is a pure substance.||1. A mixture is an impure substance.|
|2. Compounds are always homogeneous.||2. Mixtures may be homogeneous or heterogeneous.|
|3. A compound has a fixed composition, i.e., it is formed when two or more pure substances chemically combine in a definite ratio by mass.||3. A mixture has no fixed composition, i.e., it is formed by mixing two or more substances in any ratio without any chemical reaction.|
|4. Formation of a compound involves change in energy.||4. Formation of a mixture does not involve any change in energy.|
|5. Compounds have specific set of properties.||5. Mixtures do not have any specific set of properties.|
|6. Components of compounds can be separated only by complex chemical processes.||6. Components of mixtures can be separated by simple physical methods.|