important and difficult points: Structure of N2 molecule and its particular stability.Structure and properties of ammonia,properties of ammonium.Structure()and properties(powerful oxidizing agent)of nitric acid Properties of nitrate and nitrite.Structure of nitrate ion ()the basic properties and structures of elemental substance, hydrides,halides,oxides of P.properties of phosphoric acid and phosphate.Acidity/basicity of oxides and hydrates of As,Sband Bi,rule of variation of reducing/oxidizing ability.reducing ability of As(III),Sb(III),Bi(III),and oxidizing ability of As(V),Sb(V),Bi(V),exemplified with a reaction equation for each.Color,formation and dissolving of sulfides ofAs,Sb and Bi.Properties of thiosulphate (unstable in presence of acid,decompose into HS and corresponding sulfide).Structure ofO(explain paramagnetic property on the basis of structure ofO)structure(Vshape,the unique polar elemental substance))and properties of ozone;structure(sphybridization)and properties(its main property is oxidization property)of hydrogen peroxide.Allotropes of elemental substance sulfur,structure and properties of Sg.Properties of H2S(strong reducing ability),classification of methods for dissolving metal sulfides (dissolve in water,dilute acid,concentrate hydrochloride,nitric acid,and aqua regia). Structure of SO2(3)and structure of SO3().Properties of sulphite(reductive),sulfuric acid(concentrate sulfuric acid is stng oxidizing agent)and their salts.Reactions of salts of thiosulfuric acid with 12 and Cl,and structure and properties(strong oxidizing agent)of salts of disulfuric acid. Chapter 15 the p block elements(III)(2.5 hrs) $15.1 The halogens *815.2 The rare gases $15.3 The property variations for compounds ofp-block elements Aims of teaching: To be familiar with general properties of halogen,properties and preparations of elemental substances,to master reducing properties,acidity,stability of hydrogen halides and rule of property variation,as well as preparation of hydrogen halide.To master variation of acidity,stability of chlorine oxyacids and their corresponding salts.To be familiar with properties of oxyacids of bromine and iodine.To know rule of physical property variation and application of rare gasses. To be familiar with property variation of the p block elements. important and difficult points: important and difficult points: Structure of N2 molecule and its particular stability . Structure and properties of ammonia, properties of ammonium. Structure (p3 4) and properties (powerful oxidizing agent) of nitric acid。 Properties of nitrate and nitrite. Structure of nitrate ion (p4 6 ). the basic properties and structures of elemental substance, hydrides, halides, oxides of P. properties of phosphoric acid and phosphate. Acidity/basicity of oxides and hydrates of As, Sb and Bi, rule of variation of reducing/oxidizing ability. reducing ability of As(III), Sb(III), Bi(III), and oxidizing ability of As(V), Sb(V), Bi(V), exemplified with a reaction equation for each. Color, formation and dissolving of sulfides of As, Sb and Bi. Properties of thiosulphate (unstable in presence of acid, decompose into H2S and corresponding sulfide). Structure of O2 (explain paramagnetic property on the basis of structure of O2 ); structure(V shape, the unique polar elemental substance)) and properties of ozone; structure (sp3 hybridization) and properties (its main property is oxidization property) of hydrogen peroxide. Allotropes of elemental substance sulfur, structure and properties of S8 . Properties of H2S (strong reducing ability), classification of methods for dissolving metal sulfides (dissolve in water, dilute acid, concentrate hydrochloride, nitric acid, and aqua regia). Structure of SO2 (p3 4 ) and structure of SO3 (p4 6). Properties of sulphite (reductive), sulfuric acid (concentrate sulfuric acid is stng oxidizing agent) and their salts. Reactions of salts of thiosulfuric acid with I2 and Cl2 , and structure and properties (strong oxidizing agent) of salts of disulfuric acid. Chapter 15 the p block elements (III) （2.5 hrs） §15.1 The halogens *§15.2 The rare gases §15.3 The property variations for compounds of p-block elements Aims of teaching: To be familiar with general properties of halogen, properties and preparations of elemental substances; to master reducing properties, acidity, stability of hydrogen halides and rule of property variation, as well as preparation of hydrogen halide. To master variation of acidity, stability of chlorine oxyacids and their corresponding salts. To be familiar with properties of oxyacids of bromine and iodine. To know rule of physical property variation and application of rare gasses. To be familiar with property variation of the p block elements. important and difficult points: