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一、白磷的自燃将少量红磷(约半小药匙,或用火柴盒侧面的红色纸条5—7片)放入一小试管(管壁要薄)的底部,再将一小纸条揉成团状塞在试管口(不要太紧)。然后给试管底部加热,过一会儿,有白烟产生(红磷加热到416℃时变成白磷颗粒),至白烟不再产生时停止加热,过一会儿,用镊子将管口的纸条取出展开(不要用手接触),片刻,可看到纸条燃烧起来。二、溶解的放热现象贵刊1984年第五期第16页中,用液体苯的凝固做溶解时的吸热现象的实验和课本上[实验4—3]溶解对的(?)热现象结合起来
I. Spontaneous combustion of white phosphorus Place a small amount of red phosphorus (about half a small spatula, or 5-7 pieces of red paper on the side of a match box) into the bottom of a small test tube (the wall of the tube is thin), and then place a small piece of paper. Knead into a lump in the mouth of the test tube (do not be too tight). The bottom of the tube is then heated. After a while, white smoke is generated (red phosphorus becomes white phosphorus particles when it is heated to 416°C). When the white smoke is no longer generated, the heating is stopped. After a while, the paper strip is taken out with a tweezers. (Don’t touch it with your hand) For a moment, you can see the note burning. II. Dissipated exothermic phenomenon In the fifth issue of the journal 1984, page 16, the endothermic phenomenon of dissolution with liquid benzene was tested in experiments and textbooks (Experiment 4-3). Combined