氢气、甲烷（CH₄）、水各1g，其中含分子数最多的是        ；含氢原子最多的是           ；氢气、甲烷、水各1mol，含分子数是否一样多？             ；含氢原子数最多的是            。

试判断下面每组反应能否用同一个离子方程式表示，若能，写出相应的离子方程式；若不能，简要说明理由。

（1）CaCO₃ 、Na₂CO₃分别跟盐酸反应________________________________。

（2）CuO分别跟稀硫酸、稀盐酸反应________________________________。

（3）H₂SO₄、K₂SO₄溶液分别跟Ba(OH)₂反应________________________________。

氰(CN)₂、硫氰(SCN)₂的化学性质和卤素(X₂)很相似，化学上称为拟卤素。它们阴离子的还原性强弱为Cl^-<Br^-<CN^-<SCN^-<I^-。试写出

    ①(CN)₂与KOH溶液反应的化学方程式：

_________________________________________________________________；

    ②在NaBr和KSCN的混合溶液中加入(CN)₂，反应的离子方程式：

_____________________________________________________________________。

正常人的血液中葡萄糖（简称血糖，分子式为C₆H₁₂O₆）的浓度在3.61－6.11mmol/L之间，今测得某病人1mL血液中含葡萄糖0.60mg，相当于＿＿＿＿mmol/L，血糖属正常、偏高还是偏低？                。

以下说法正确的是  (    )

A．物质所含元素化合价升高的反应叫还原反应

B．在氧化还原反应中，失去电子的元素化合价降低

C．物质中某元素失去电子，则此物质是氧化剂

D．还原剂中必定有一种元素被氧化

下列关于反应类型关系正确的是　　(    )

为达到预期的实验目的，下列操作正确的是

A．欲配制质量分数为10％的ZnSO₄溶液，将l0 g ZnSO₄·7H₂O溶解在90 g水中

B．欲制备F(OH）₃胶体，向盛有沸水的烧杯中滴加FeCl₃饱和溶液并长时间煮沸

C．为鉴别KCl、AICl₃和MgCl₂溶液，分别向三种溶液中滴加NaOH溶液至过量

D．为减小中和滴定误差，锥形瓶必须洗净并烘干后才能使用

有 ① Na₂CO₃溶液  ② CH₃COONa溶液  ③ NaOH溶液各25mL，物质的量浓度均为0.1mol·L^－1，下列说法正确的是

A．3种溶液pH的大小顺序是 ③＞②＞①

B．若将3种溶液稀释相同倍数，pH变化最大的是②

C．若分别加入25mL0.1mol·L^－1盐酸后，pH最大的是①

D．若3种溶液的pH均为9，则物质的量浓度的大小顺序是③＞①＞②

As the pace of life continues to increase, we are fast losing the art of relaxation. Once you are in the habit of rushing through lift, being on the go from morning till night, it is hard to slow down. But relaxation is essential for a healthy mind and body.                              

Stress is a natural part of everyday life and there is no way to avoid it. In fact, it is not the bad thing it is often supposed to be. A certain amount of stress is vital to provide motivation and give purpose to life. It is only when the stress gets out of control that it can lead to poor performance and ill health.                                                

The amount of stress a person can withstand depends very much on the individual. Some people are not afraid of stress, and such characters are obviously prime material for managerial responsibilities. Others lose heart at the first signs of unusual difficulties. When exposed to stress, in whatever form, we react both chemically and physically. In fact we make choice between "fight" or "flight" and in more primitive days the choice made the difference between life or death. The crises we meet today are unlikely to be so extreme, but however little the stress is, it involves the same response. It is when such a reaction lasts long, through continued exposure to stress, that health becomes endangered. Such serious conditions as high blood pressure and heart disease have established links with stress. Since we cannot remove stress from our lives (it would be unwise to do so even if we could), we need to find ways to deal with it.                                                               

People are finding less and less time for relaxing themselves because_____.                                                  

A. they do not know how to enjoy themselves                                        

B. they do not believe that relaxation is important for health      C. they are travelling fast all the time                                                    

D. they are becoming busier with their work  

以惰性电极电解CuSO₄溶液。若阳极上产生气体的物质的量为0.0100mol，则阴极上析出Cu的质量为（　　）

A．0.64g            B．1.28g        C．2.56g           D．5.12g