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.
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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.
A pure substance is one that consists of a single type of particle, with all constituent particles being identical in their chemical nature. It lacks any mixture or variation in its composition.
In science, “pure” refers to a substance composed entirely of particles with the same chemical nature. It indicates a homogeneous composition without any adulteration or mixture of different substances.
During evaporation, water molecules absorb heat energy from the surroundings, increasing their kinetic energy. As they gain enough energy, they break free from the liquid phase and enter the gaseous phase as vapor.