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describe the difference between pure substances and mixtures
Question | Answer |
---|---|
pure substance | a sample of matter either a single element or a single compound that has definite chemical and physical properties |
compound | a substance made up of atoms of two or more different joined by chemical bond |
molecule | the smallest unit of a substance that keep all of the physical properties of that substance |
chemical formula | a combination 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 combination of two or more substance that are not chemically combined |