A chemical is anything that is only made from one kind of molecule for example (Pure) water is just water H2O, oxygen is just oxygen, but air isn’t a chemical because it is made of Oxygen, nitrogen, carbon dioxide etc. in the example of water (H20) even though water is made from hydrogen and oxygen the molecules are stuck together at an atomic level this makes it a chemical compound. If the different elements/compounds are mixed together but the atoms arnt stuck together through chemical bonds then you have a mixture. If there is only one type of atom for example Oxygen you have a chemical element.
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