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Chemical wholesaler maleic acid boiling point is 202 °C (at 1 atmosphere), Powder form, purity 99% price 0.1 dollar /kg 1. Acid + metal oxide - → Salt + water Fe2O3+6HCl===2FeCl3+3H2OFe2O3+3H2SO4===Fe2(SO4)3+3H2OCuO+2HCl===CuCl2+H2OCuO+H2SO4===CuSO4+H2O2. Acid + base - → Salt + water NaOH+HCl===NaCl+H2O2NaOH+H2SO4===Na2SO4+2H2OCa(OH)2+H2SO4===CaSO4+2H2OAl(OH)3+3HCl===AlCl3+3H2OCu(OH)2+2HCl=== =Cu Cl2+2H2O Unit 1 Metals and metallic materials Common metallic materials and their chemical properties and applications 1. 

Several important metals and alloys (1) Physical properties of metals: in addition to mercury (liquid) at room temperature are solid, metallic luster, most of them are excellent conductors of electricity and heat, ductility, high density, high melting point. 

(2) The comparison of several common metals (see Table 8-18-1) : Table 8-18-1 Metal physical properties used iron Pure iron has a silver-white metallic luster, soft, good ductility, density 7.86g/cm3, melting point 1535℃, boiling point 2750℃, is a good conductor of electricity and heat electrical appliances, construction, industrial materials, such as: Manufacturing Bridges, rails, ships, vehicles and all kinds of machinery and other copper purplish red metal, density 8.92g/cm3, melting point 1083℃, boiling point 2595℃, with good ductility, electrical conductivity, thermal conductivity wires, cables and various electrical appliances, copper alloy can be used to manufacture various parts and other aluminum silver metal, density 2.70g/cm3, Melting point 660℃, boiling point 2467℃, with good ductility, electrical conductivity, thermal conductivity smelting metal, wire, cable, aluminum alloy for the manufacture of doors and Windows, aircraft, etc. 

(3) alloy: ① Concept: in a metal heating fusion of other metals or non-metals, and the formation of a material with metal characteristics called alloy. The properties of the alloy: many properties of the alloy are different from the pure metal that consists of them, making the alloy more suitable for different uses, and most of the metal materials used in daily life are alloys. ③ Important iron alloys: pig iron and steel are iron alloys, the difference is that the carbon content is different. The iron content of pig iron is 2% to 4.3%, and the carbon content of steel is 0.03% to 2%. Test point

2. Most metals can react with oxygen, but the difficulty and intensity of the reaction is different, the more active the metal, the easier it is to chemically react with oxygen, the more intense the reaction. 

(1) The reaction of magnesium, aluminum and oxygen: ① At normal temperature, the magnesium strip is slowly oxidized in the air to produce a white solid - magnesium oxide, but under the ignition condition, the magnesium strip can be violently burned in the air to produce a white solid. At room temperature, aluminum oxidizes slowly in the air, forming a dense oxide film on its surface to prevent further oxidation of aluminum inside, therefore, aluminum has good corrosion resistance; Under the conditions of ignition, aluminum is violently burned in oxygen to form a white solid - alumina (Al2O3). (2) The reaction of iron and oxygen: ① At normal temperature, iron is difficult to react with oxygen in dry air; 

② At room temperature, iron is easy to rust in humid air; 

③ Under the conditions of ignition, iron burns violently in oxygen, Mars radiates, releases a lot of heat, and generates a black solid substance - ferric oxide 

(3) copper and oxygen reaction: ① At room temperature, copper almost does not react with oxygen in dry air; When copper is heated in the air, the surface will gradually form a black substance - copper oxide; ③ Copper is easy to form patina (basic copper carbonate) in humid air.