一、选择题1.将一定量铝粉和氧化铜混合加热,反应的化学方程式为3CuO+2Al高温3Cu十Al2O3.反应结束后,为了检验氧化铜是否完全反应,取少量反应后的固体,加入足量稀硫酸,充分反应后,将铁片插入溶液中.下列叙述的现象中,能够说明氧化铜没有 First, multiple-choice questions 1. A certain amount of aluminum powder and copper oxide mixture heating, the reaction of the chemical equation 3CuO + 2Al high temperature 3Cu 10 Al2O3. After the reaction is completed, in order to test whether the complete reaction of copper oxide, take a small amount of reaction after the solid, add After sufficiently reacting with dilute sulfuric acid, the iron tablets are inserted into the solution. The phenomenon described below can indicate that the copper oxide is not