CHEM 112 Chapter Notes - Chapter 17: Nitride, Potential Method, Indium
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Chapter 18 - the representative elements: groups 1a through 4a. 0. 03: major elements in the human body. 0. 003: metallurgy - obtaining a metal from its ore, reduction of metal ions to atoms, usually using carbon as the reducing agent. 2sno(s) + c(s) + heat (cid:224) 2sn(s) + co2(g) 2pbo(s) + c(s) + heat (cid:224) 2pb(s) + co2(g) 18. 3 hydrogen: properties, colorless, odorless, low boiling (-253 c) and melting (-260 c)points, highly flammable, purification of hydrogen, decomposition of methane in water, using heat, pressure and a catalyst. 18. 4 the group 2a elements - the alkaline earth metals: basicity of oxides, mo(s) + h2o(l) (cid:224) m2+(aq) + 2oh-(aq) Beo has amphoteric properties: reaction with water, uses. M(s) + h2o(l) (cid:224) m2+(aq) + 2oh-(aq) + h2(g) Note: detergents are less soluble in hard water. There is noticeable difficulty, for instance, washing detergent out of one"s hair when the concentration of group ii ions is high.
