单词	pentoxide
释义	pentoxide /pɛnˈtɒksʌɪd / noun Chemistry An oxide containing five atoms of oxygen in its molecule or empirical formula.Glass-forming substances are usually silica, boric oxide, phosphorous pentoxide, or feldspars.... In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride. The thin covering is composed of alternating layers of silicon dioxide and tantalum pentoxide.
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