Chemistry

What is the oxidation number on the chromium in a dichromate ion "(Cr2O7)^2-"?

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What branch of chemistry is concerned with the chemistry of living organisms?
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An atom of which of the following elements has the smallest volume?
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Which of these chemicals is often used to reduce phosphates in water?
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What is the chemical symbol for lead?
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Which of the following words mean "made stronger"?
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On a prescription, what does "QOD" stand for?
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From all salt elements, which group is most soluble?
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Which of the following elements has the heaviest atomic weight?
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