论文部分内容阅读
高中化学第一册 1.硫跟金属的反应 (1)硫跟铜的反应,将硫加热到沸腾,直到硫蒸气的回流升到试管的1/3处。然后将一束细铜丝灼热后迅速伸入。烧铜丝的灯焰不要离试管口太远。 (2)硫跟铁的反应,如果缺少很细的还原铁粉,而用机械加工的废铁粉,实验可按下法进行:试管(用20毫升的废安瓿代替)中放硫2-3克,加热到硫沸腾,加入铁粉并继续加热(集中火力于试管底部),到混和物开始放出红光时,离开火焰,观察反应的进行。铁跟硫的用量比:7∶4.5,硫比理论用量7∶4稍多。废铁粉的来源及处理:a.从砂轮上打下的新鲜
High School Chemistry Book 1 1. Reaction of sulfur with metal (1) The reaction of sulfur with copper heats the sulfur to boiling until the return of the sulfur vapor rises to 1/3 of the test tube. Then a bunch of thin copper wire hot quickly after the extension. Burning copper wire lamp flame test tube mouth too far. (2) The reaction of sulfur with iron, if the lack of very fine reduced iron, but the use of mechanical processing scrap iron, the experiment can be carried out as follows: Test tube (with 20 ml of waste ampoule replaced) G, heat to sulfur boil, add iron powder and continue to heat (concentrate fire at the bottom of the tube) until the mixture begins to emit red light, leave the flame and observe the progress of the reaction. The ratio of iron to sulfur: 7: 4.5, slightly more than the theoretical amount of sulfur 7: 4. Scrap iron sources and treatment: a. From the wheel laid fresh