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  1. ...concentration = 0.02/0.022 = 0.909 M (2) Since anhydrous sodium carbonate is hygroscopic (absorbing moisture from air), its mass may vary in the process of weighing, making an inaccurate result.

    分類:科學及數學 > 化學 2010年02月21日

  2. ... are the elements in group 18 (also sometimes Group 0... 18) of the periodic table. It is also called helium family or neon... outer shell can hold. A thorough explanation requires an ...

    分類:科學及數學 > 化學 2007年10月04日

  3. ... teacher's instruction 2. Maintains in the laboratory the channel to be unimpeded 3. Maintains the laboratory to be ...laboratory procedure 6. Afterexperiment thorough clean both hands 1. After teacher...

    分類:科學及數學 > 化學 2008年09月24日

  4. ...automatically even at 0K, this is what we call the zero point energy...possible difference of electronegativity in the periodic table, as purely ionic compound... they involved most thorough electron transfer and least polarization and...

    分類:科學及數學 > 化學 2007年05月14日