题目

B Doctors say anger can be an extremely damaging emotion, unless you learn how to deal with it. They warn that anger can lead to heart disease, stomach problems, headaches, emotional problems and possibly cancer. Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Others burst with anger, and scream and yell(叫喊，呼喊). But other people keep their anger inside. They can not or will not express it. This is called repressing (抑制，压抑)anger. For years many doctors thought that repressing anger was more dangerous to某同学利用下图所示的实验装置进行铁跟水蒸气反应的实验，并继续研究铁及其化合物的部分性质．请回答下列问题：（1）硬质试管中发生反应的化学方程式为______．（2）该同学欲确定反应后硬质试管中固体物质的成分，设计了如下实验方案：①待硬质试管冷却后，取少许其中的固体物质溶于稀硫酸得溶液B；②取少量溶液B滴加KSCN溶液，若溶液变红色则说明硬质试管中固体物质的成分是______，若溶液未变红色则说明硬质试管中固体物质的成分是______．（3）该同学按上述实验方案进行了实验，结果溶液未变红色，原因是：______（用离子方程式表示）．（4）该同学马上另取少量溶液B，使其跟NaOH溶液反应．若按右图所示的操作，可观察到生成白色沉淀，迅速变成灰绿色，最后变成红褐色的现象，请写出与上述现象相关的反应的化学方程式：______．（5）一段时间后，该同学发现（3）中未变红的溶液变成红色，说明Fe2+具有______性．由此可知，实验室中FeSO4溶液要临时配制并加少量铁粉的原因是______．