Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...
Classification of Matter: 1. Substance: A pure form of matter with a fixed composition and uniform properties. Examples: water (H2O), salt (NaCl), sugar (C6H12O6) 2. Mixture:* A physical combination ...
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