Chemistry

On a prescription, what does "QOD" stand for?

More Questions from Chemistry
Which is more abundant in the earth's crust?
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What symbol appears on the periodic table for the element with the atomic number 96?
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What are chemicals that reduce or prevent oxidation called?
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What symbol appears on the periodic table for the element with the atomic number 92?
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Who discovered calcium and barium?
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What is the chemical element with symbol "N" and atomic number 14?
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Europium on the periodic table is noted by which symbol?
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The Nature of the Chemical Bond, was published in 1939, who wrote it?
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