Hydrogen 0.0 / 5 ? ChemistryInorganicUniversityNone Created by: HannahWedgeCreated on: 14-05-16 14:36 Boiling point 20K 1 of 17 Melting point 14K 2 of 17 Density 0.08g dm-3 3 of 17 H-H bond length 0.74 angstrums 4 of 17 Bond energy 436kJ mol-1 (generally unreactive at RT) 5 of 17 Electronegativity 2.2 6 of 17 Synthesis of H2 Steam reforming (notes for eqtns) produces most of 40 mill. tonnes p.a. 7 of 17 Uses of H2 Haber Bosch (produce ammonia). Conversion of syn-gas to methanol. Also hydrogenation of alkenes and reduction of metals 8 of 17 Group 1 hydrides React rapidly with H2O. 2MH+H2O -> 2MOH+H2. Laregly ionic, colourless. LiH = largest covalent character 9 of 17 Group 2 hydrides Largely ionic, colourless. MgH2 largely covalent character. BeH2 different - covalent polymeric (3c-2e). React with H20 but BeH2 relatively stable. 10 of 17 Diborane Made from BF3 and NaH. Gas. Flammable in air -> B(OH)3. 3c-2e bonds. Strong lewis acid 11 of 17 Group 14 hydrides Many CnHm. Si, Ge, Sn = gasses + decompose on heating. Combust to EO2 + H2O. Formed from ECl4 + LiAlH4. Act as H+ source with strong base 12 of 17 Group 15 hydrides Gas. Free e- pair = lewis bases. Also H+ source for strong bases. Both for ammonia- 2NH3 ->NH4+ + NH2-. Made same way as 14 (except ammonia) 13 of 17 Group 16 hydrides toxic gas (except h2o). Lewis bases. Lewis acids in h2o. 14 of 17 H2O2 Strong oxident. 2 mill. tonnes produced p.a. Bleaching, anti-septics. Thermodynamically unstable. 15 of 17 Group 17 hydrides gas. acidic. 16 of 17 What are guest molecules in the holes of ice called? Clathrate hydrates 17 of 17
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