pptx, 173.95 KB
pptx, 173.95 KB
Slide poses two questions about the mass of a marble and counting marbles for students to consider. It offers a good solution to the questions but students may come up with their own ideas. This leads in to an explanation of why chemists use relative atomic masses and an example of the calculation with a visual prompt to show the 75% 25% distribution.
Creative Commons "NoDerivatives"

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