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A chemical substance is something that has a constant chemical composition and characteristic properties. A chemical substance can be a chemical compound, an alloy, or a simple substance. Often we regard a chemical substance as something which is clean and pure to set them apart from mixtures. A common example of a substance is pure water. If it is obtained from a river or produced in a lab. Both will have the exact chemical composition.
Chemical substances can be found in solid, liquid, gas, or in plasma states. They can change from one phase to another through a chemical reaction, temperature, pressure, or with time.
In chemistry, a mixture is a physical combination of two or more than two chemical substances/substance. The chemical substances did not combine chemically in a mixture, they just mix. For example Colloids, suspensions, and solutions, etc.
Each chemical substance in a mixture will not bind chemically there is no chemical bond. The melting point of a mixture will differ from its component's melting point. This is a change in physical property but there will be no chemical changes.
Mixtures can be separated through mechanical techniquies. Such as centrifugation, electrolysis, distillation, heat, and filtration, etc.
There are two main types of mixture, Homogeneous and heterogeneous.
A mixture in which the composition is uniform. It may be consists of two or more than two components. Take air as an example, it is a mixture of different gases. Such as Oxygen, Nitrogen, and argon, etc.
A mixture in which the composition is not uniform. It may be consists of two or more than two components. Take for example muddy water which is consists of sand and water. It is an example of a Heterogeneous mixture.
A substance that has a constant chemical composition.
A mixture is a physical combination of two or more than two chemical substances. The components in a mixture did not combine chemically ( chemical bond).
A mixture in which the composition is uniform throughout the mixture. For example, Air.
A mixture in which the composition is not uniform throughout the mixture. For example, Muddy water.