【单选题】Why People Buy Why do people buy? Why do people choose to buy certain products? These are important questions for manufacturers and businesses. One of the reasons is advertising. Manufacturers know th...
【简答题】已知:苯甲酸在水中的溶解度为:0.18g(4℃)、0.34g(25℃)、6.8g(95℃)。乙醚的沸点为34.6℃。实验室常用苯甲醛制备苯甲醇和苯甲酸,其原理为:2C 6 H 5 ―CHO+NaOH C 6 H 5 ―CH 2 OH+C 6 H 5 ―COONa 实验步骤如下: ①向如图所示装置中加入适量 NaOH、水和苯甲醛,混匀、加热,使反应充分进行。 ②从冷凝管下口加入冷水,混匀,冷却。倒入...