例1根据下列描述,推测各物质可能具有的性质: (1)只能用排水法收集的一种气体. (2)必须保存在冷水中的一种固体. (3)实验室必须用棕色试剂瓶盛装的液体. 解析:推测“可能”具有的性质,不能答成“肯定”具有的性质,因此回答成:(1)难溶于水,不与水反应;(2)密度比水大,难溶于水,不与水反 Example 1 Based on the following description, inferred the possible properties of each substance: (1) A gas that can only be collected by drainage. (2) A solid that must be kept in cold water. (3) The laboratory must use brown reagents. Liquid contained in the bottle. Analysis: It is presumed that the nature of “possible” cannot be answered to the nature of “affirmative”. Therefore, the answer is: (1) It is difficult to dissolve in water and does not react with water; (2) Density Larger than water, hardly soluble in water, not anti-water