在九年级化学上册“对蜡烛燃烧及其探究”的实验中,确定蜡烛燃烧产物为水过程中,好多教师都遇到过这种尴尬,即在蜡烛上方罩一个冷的干燥的烧杯根本无法看到小水珠,因为这时为九月份,就算在北方,温度也不低,所以,看不到水珠。要怎样才能如愿以偿地观察到水珠呢?那就要进行以下的改进: In the ninth-grade chemistry, Experiments on the Burning of Candles and Their Exploration, it was awkward for many teachers to identify the burning products of candles as water, covering a cold, dry beaker over the candles Can not see the small drops of water, because at this time in September, even in the north, the temperature is not low, so I can not see the drops of water. How can we get our wish to see the drops of water? Then make the following improvements: