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S8P1.b
Describe the difference between pure substances and substances
Term | Definition |
---|---|
Pure Substance | a sample of matter ,either a single element or a single compound, that has definite chemical and physical properties |
Compound | a machine made up of two or more different elements joined by chemical bonds. |
Molecules | the smallest unit of a substances that keeps all of the properties |
Chemical Formula | a combination of chemical symbols and numbers to represent a substance |
Subscript | a small number written to the right and slightly below a chemical symbol to tell the number of atoms of that element in the substance |
Mixture | a substance made by combining two or more different materials in such a way that no chemical reaction occurs. |