2014年11月，乐山人民翘首以盼的“成﹣绵﹣乐”高速列车（又称高铁）终于通车了．这不仅对乐山、成都、绵阳，对四川乃至西南地区的社会经济发展都会带来积极而深远的影响．

结合所学的化学知识，回答下列有关的问题：

（一）高铁列车上可提供下列用品：纯净水、食盐、橙汁、牛奶、饼干、蔗糖等．

（1）写出：①食盐化学式____ ；②两个水分子____ ；

（2）上述物质中，含蛋白质最丰富的物质是____；含维生素最丰富的物质是____；

（3）从宏观角度看，水是由____组成的．

（二）修建铁路所需大量钢铁是以铁矿石为主要原料冶炼而得．

（1）写出用一氧化碳和赤铁矿炼铁的化学方程式____ ；

（2）钢是含0.03%﹣2%____的铁合金；

（3）雨后的铁轨表面易产生少量的锈迹，这是因为____；

（4）实验室可用盐酸除铁锈，其化学方程式为____ ；

（5）铝热剂是修建铁路时常用的焊接材料，其反应原理是铝在一定条件下与氧化铁反应得到熔融的铁与另一种氧化物，该反应基本类型是____．

（三）与高铁的电动列车形成鲜明对比的是以煤炭燃烧为动力的乐山嘉阳小火车，它是目前世界上仅存的少数几辆仍在运行的蒸汽机车之一，被称为“工业文明的活化石”．

（1）煤炭燃烧应具备的条件：①与空气（或氧气）接触，②____；

（2）在下列物质中，既是煤的燃烧产物，又会与空气中的水蒸汽形成酸雨的是____ ；

①二氧化碳、②粉尘、③氮气、④二氧化硫、⑤一氧化碳、⑥二氧化氮

（3）从化学的角度分析蒸汽列车被电动列车淘汰的原因（任举一点）____．

（四）由于高铁列车车厢是密闭的空间，因此提供清洁的空气、保持车厢的卫生非常重要．

（1）高铁酸钠（Na₂FeO₄）是高铁上常用的一种“绿色环保高效”消毒剂．

①高铁酸钠中铁元素的化合价为____ ；

②下面是一种制备高铁酸钠的反应原理：Fe₂O₃+3NaNO₃+4NaOH=2Na₂FeO₄+3NaNO₂+2X，X的化学式为____ ．

（2）某品牌的空气净化剂含有过氧化钠（Na₂O₂），它可以使车厢里的二氧化碳转化为碳酸钠和氧气，写出其化学反应方程式____ ．

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Your Teen Is Falling Asleep in Class

    Teens have a busy morning schedule as they need to wake up and get moving very early in order to catch a bus and get to school by the required time. This means teens need to get their rest the night before or they will be too tired to learn anything at school. ____

    When a teen falls asleep in class, two things happen: he/she misses what is being taught and he/she loses the respect of the teacher. He/She may also receive a consequence from the school, depending on the classroom discipline policy. ____

    To prevent your teen from being sleepy in class, try these three tips：

    *Set a time for “lights out” on school nights. This is never any later than 10 p.m. and preferably 9 p.m. ____ Soft music can be on and used to help calm your teen.

    *Help your teen develop a nighttime routine that involves activities that slow them down for the end of the day. ____ Turning off the computer and disconnecting from friends and the excitement of the day an hour before bedtime will also help your teen relax.

    * ____ This will reinforce (增强) what it feels like to be rested and capable of accomplishing what he/she wants.

A．What's worse, they may even fall asleep in class.

B．Set a good example and show him/her your love for learning.

C．Taking a bath and reading are two activities that work well.

D．Point out the positives after your teen has had a good night's rest.

E．All of these things affect your teen's academic success and can be avoided.

F．“Lights out” means the computer, television, lights and cell phone should be off.

G．While your teen keeps his/her goals in line with your expectations, he/she may have his/her own goals.