题目

“Old wives tales” are beliefs passed down from one generation to another, For example, most of us remember our parents’ telling us to eat more of certain foods or not to do certain things．Is there any truth in these teachings? Some of them agree with present medical thinking, but others have not passed the test of time．        Did your mother ever tell you to eat your carrots because they are good for your eyes? Scientists now report that eating carrots can help prevent a serious eye disease called macular degeneration．Eating just one carrot a day can reduce the possibility o实验室可用如下两种方法制取氧气（1）某学生高锰酸钾进行制取氧气的实验，写出如图中标有字母的仪器的名称：a______b______c______d______e______（2）利用如图装置收集到一瓶氧气后，发现水变成紫红色，原因可能是：______；该反应的文字表达式是：______．（3）氧气也可用过氧化氢（俗名双氧水）分解制得，再加入少量二氧化锰，可看到试管里很快产生大量的气泡，如图，该收集方法为向上排气法是根据氧气的______性质，如何确定氧气是否收集满？______．二氧化锰在反应前后化学性质和质量都没有变化，说明二氧化锰在反应中起______作用．该反应的文字表达式为：______（4）上述两种药品制取氧气都属于______反应（填“化合”或“分解”）；根据以上装置你认为A、高锰酸钾；B、双氧水哪种方法更好______理由是______（任答一点）．