| hydrogen iodide |
a colorless gas that yields hydroiodic acid in aqueous solution
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| hydrogen ion |
a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus
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| hydrogen ion concentration |
the number of moles of hydrogen ions per cubic decimeter
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| hydrogen peroxide |
a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used as a disinfectant and (in strong concentrations) as an oxidant in rocket fuels
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| hydatidiform mole |
hydatid mole: an abnormality during pregnancy; chorionic villi around the fetus degenerate and form clusters of fluid-filled sacs; usually associated with the death of the fetus
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