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Matter can be classified into 2 groups, Pure substance and Mixture.

Pure substance is a type of matter with "the same physical and chemical properties throughout the sample". Examples include tin, copper, oxygen, chlorine.

Mixtures on the other hand, are two or more combined substances that can be seperated. Some examples include smog, mud, sea water and air.
The states of matter are, gas, liquid and solid. Matter is anything that has space, and mass. It can be classified by chemical and/or physical properties. Gas has a hazard classification. Particles packed tightly that they can define a shape or volume. Liquid is also loosely packed particles. Solid is tightly packed particles that has a defined shape and volume.

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