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将化学原理设计成富有情趣的趣味题，使同学们在沉闷中答题兴趣倍增，能在轻松的氛围中迅速解答。现选析以NaOH为例的中考趣味题，以飨读者。 一、“化学”消失 例1 (江苏省扬州市中考题)小华将一张滤纸在某指示剂中浸泡后晾干，用蘸有氧氧化钠溶液的玻璃棒在上面写“化学”两字，立即显红色。再将其悬挂于铁架台上，并在滤纸的下方(如图)放置盛有某溶液的烧杯，过一会儿，发现红色的字消失，则滤纸上
The chemistry principle is designed to be a fun and interesting question, so that the students can double their enthusiasm and answer questions in a relaxed atmosphere. The examination questions of NaOH, which are exemplified by NaOH, are selected for readers. I. “Chemistry” disappearance of Case 1 (Yangzhou City, Jiangsu Province, for the exam question) Xiaohua soaked a piece of filter paper in an indicator and dried. Use a glass rod containing aerobic sodium oxide solution to write “Chemical” on it. Immediately red. Then hang it on the iron stand and place a beaker containing a certain solution under the filter paper (as shown in the figure). After a while, the red word disappears.