Ex

  Chemistry (NTSE/Olympiad)  

2. Is Matter Around Us Pure

Mixtures

Properties of Mixture
A mixture can be separated into its constituents by physical processes.
A mixture shows the properties of all the constituents present in it.
Energy is usually neither given out nor absorbed in the preparation of a mixture. So, the formation of a mixture is a physical change.
The composition of a mixture is variable, the constituents can be present in any proportion by mass.
A mixture does not have a definite melting point, boiling point.
A mixture is usually heterogeneous.
Differences between mixtures and compounds
Mixture Compound
1. A mixture can be separated into its constituents by the physical processes (Like filtration, evaporation etc.) sublimation, distillation, solvents, magnet, etc.). 1. A compound cannot be separated into its constituents by physical processes (It can only be separated into its constituents by chemical processes).
2. A mixture shows the properties of its constituents. 2. The properties of a compound are entirely different from those of its constituents.
3. Energy (in the form of heat, light, etc.) is usually neither given out nor absorbed in the preparation of a mixture 3.Energy (in the form of heat, light, etc.) is usually given out or absorbed during the preparation of a compound.
4. The composition of a mixture is variable, the constituents can be present in any proportion by mass. A mixture does not have definite formula. 4. The composition compound of a compound is fixed, the constituents are present in fixed proportion by mass.
5. A mixture does not have a fixed melting point, boiling point. 5. A compound has a fixed melting point, boiling point.

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