Sodium chloride is considered a pure substance because it consists of only one kind of pure matter throughout its composition. It cannot be separated into simpler substances by physical processes.
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Dissolved sodium chloride can be separated from water through the physical process of evaporation. By heating the solution, the water evaporates, leaving behind the solid sodium chloride.
Everyday mixtures include sea water, minerals, soil, air, and many food items like soup or salad. These substances consist of two or more pure components blended together, each retaining its individual characteristics within the mixture.
One example of a pure substance is elemental gold (Au). It consists solely of gold atoms, making it a homogeneous substance with uniform chemical properties throughout.
Milk contains various components such as water, fat, proteins, and minerals, making it a mixture rather than a pure substance. Each component retains its distinct chemical nature within the mixture.