生活中的化学现现象及解释50例（The phenomena of chemistry in life and the explanation of 50 cases）.docVIP

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生活中的化学现现象及解释50例（The phenomena of chemistry in life and the explanation of 50 cases）.doc

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生活中的化学现现象及解释50例（The phenomena of chemistry in life and the explanation of 50 cases）

生活中的化学现现象及解释50例（The phenomena of chemistry in life and the explanation of 50 cases） The chemistry of life phenomenon and explain between 50 cases of.Txt and two peoples feelings like knitting a sweater, a glimmer, careful and long, when the demolition of lightly The phenomena of chemistry in life and the explanation of 50 cases The college entrance examination requires students to understand some of the chemical phenomena in their lives, and to explain some of the phenomena. Below, according to the syllabus and teaching materials, collect and reflect 50 examples of chemistry permeated with life and production, so as to help students review and prepare for exams. 1. in the mountains? Common thick neck disease (goiter), cretinism (cretinism), the doctor recommended to eat kelp, food therapy. The cause of the disease is the bodys absence of an element: iodine. 2. the metal used to make cigarettes and candies is aluminum. 3. the melting point of gold is 1064.4 degrees centigrade, much higher than the melting point of gold. It is about 3 times higher than the melting point of gold. 4. a woman made an old gold ring of 6.10 grams into a pair of Earrings by the gold and silver maker. She was afraid of craftsmen stealing gold or adulteration, and kept on the side, not to leave. She saw the craftsman will ring heating, beating, and placed in a liquid, such as multiple processing, a pair of earrings beautifully finished processing. After a few days, this pair of earrings with balance weighing only 5.20 grams. By then the craftsman to steal gold liquid is: Aqua regia. 5. black and white photographs of the black material is: silver. 6., many chemical elements play an important role in peoples life activities. Without them, people will become ill. For example, children often suffer from rickets is due to the lack of calcium. 7. a lamp made from a gas filled in a quartz tube that emits more than a million times as much light as a fluorescent lamp when it is energized, so it is cal