CHEMISTRY 5070
Cambridge GCE O Level · Practice
Count it, split it
Can you read
the whole formula?
Count every atom in each formula, then split the compound into its ions. Coefficients multiply the whole formula; numbers outside brackets multiply everything inside.
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Tip: enter ion charges with a caret, for example SO4^2-. Subscripts may be typed as ordinary numbers. Progress stays in this browser tab only.