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The formula of H2O, water on the surface of the Earth most widely distributed, or about the Earth's surface 3 / 4, the atmosphere contains water vapor, soil, rocks, animals and plants - which also contain large amounts of water, animals body of about 70% water, fresh plants in the water about 80 ~ 90%, the content of water on Earth about 2 × 1018 tons.
18 centuries ago, people think the water is a single quality, in 1781 the British chemist Cavendish discovered hydrogen in the air combustion of the product is the only water, water is proved by hydrogen, oxygen composed of two elements of adducts. Years later, Lavoisier determination of water quality components. Modern theory has proved that water molecules were V-shaped structure. X-ray determination of the crystal water (ice) structure, proved two O-H bond formed between 104.5 ° angle of the keys, as water molecules are asymmetrical structure, an old friend of polar water molecules. The experiments also demonstrated that hydrogen-bonded water molecules to pass through occurred association, the formation of more complex molecules Group, the steam boiling water containing 3.5% of the water-molecule (H2O) 2. liquid water contains more complex (H2O) n molecule (n can be 2,3,4 ...), which are more complex Associating water molecules and the chemical nature of water ( H2O) the same.
water is colorless, odorless and tasteless liquid, the natural deep water was blue and green. The heat capacity of water to 4.1868 Bajur / g degrees (a card / g degrees), in all liquid and solid substances, water largest heat capacity. Water at 4 ° C for 1g/cm3 density. In Pago 101,325 (1 atm), the boiling point of water at 100 ° C, water thermal gasification of 2.257 kJ / g, the solidification point is 0. Water is extremely weak electrolyte, temperature, water ionization constant of 1.8 x 10-16, water ion plot kw = 1 × 10-14.
water is more stable compounds, in 1000 ° Cabove only begin to decompose. In sulfuric acid or sodium hydroxide under such conditions exist, electrolysis of water to generate hydrogen and oxygen. Many of the activities of strong metals such as K, Na, Ba, Ca at room temperature with the water can be produced by the reaction of hydrogen and alkali, Mg, Al heating to the boiling water with the reactions of alkali and hydrogen. Water would be many more activities with metal such as zinc, iron and other high temperature metal oxides produced by the reaction and hydrogen. Water can react with certain non-metallic, such as :
2F2 +2 = Mare H2O + O2< / SUB> ?
the water with alkaline oxide many as K2O, Na2O, CaO, BaO, MgO, etc. combine to form alkali, and a variety of water can be acidic oxide SO3< / SUB>, SO2, CO2, etc. combine to form P2O5 phase should the acid. Water can with some salt or ester, sugar and other organic hydrolysis reaction occurred.
water is a widely used solvent, polar material (such as HCl, NaCl) easily dissolved in water.
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More Detailed Data:
1) water
2) water
3) Water;dihydrogen oxide;distilled water
4) water
5) red water;ferruginous discharges
6) raw water
7) hard water
8) hard water
9) soft water
10) bound water;hound moisture
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