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一、“经典”习题及答案1.习题出处1将一只新鲜鸡蛋放入水中,鸡蛋沉入水底。加入适量浓盐酸后,鸡蛋会出现上浮、下沉、再上浮、再下沉的现象,反复多次。(1)鸡蛋壳的主要成分是什么?(2)用化学和物理知识解释鸡蛋上浮、下沉多次的原因。(3)自己在家中用食用醋代替盐酸试一试(先放鸡蛋后倒醋),观察实验现象,并与鸡蛋和稀盐酸反应的现象比较。
First, “classic” exercises and answers 1. Exercises 1 Put a fresh egg into the water and the egg sinks into the water. After adding the appropriate amount of concentrated hydrochloric acid, the egg will float, sink, float, and sink again and again. (1) What are the main components of the egg shell? (2) Explain the reason why the egg floats and sinks several times using chemical and physical knowledge. (3) At home, try vinegar instead of hydrochloric acid in the home (put the egg first and then pour the vinegar), observe the experimental phenomenon, and compare it with the phenomenon of egg and dilute hydrochloric acid.