氫氣、甲烷（CH₄）、水各1g，其中含分子數最多的是        ；含氫原子最多的是           ；氫氣、甲烷、水各1mol，含分子數是否一樣多？             ；含氫原子數最多的是            。

試判斷下面每組反應能否用同一個離子方程式表示，若能，寫出相應的離子方程式；若不能，簡要說明理由。

（1）CaCO₃ 、Na₂CO₃分別跟鹽酸反應________________________________。

（2）CuO分別跟稀硫酸、稀鹽酸反應________________________________。

（3）H₂SO₄、K₂SO₄溶液分別跟Ba(OH)₂反應________________________________。

氰(CN)₂、硫氰(SCN)₂的化學性質和鹵素(X₂)很相似，化學上稱為擬鹵素。它們陰離子的還原性強弱為Cl^-<Br^-<CN^-<SCN^-<I^-。試寫出

    ①(CN)₂與KOH溶液反應的化學方程式：

_________________________________________________________________；

    ②在NaBr和KSCN的混合溶液中加入(CN)₂，反應的離子方程式：

_____________________________________________________________________。

正常人的血液中葡萄糖（簡稱血糖，分子式為C₆H₁₂O₆）的濃度在3.61－6.11mmol/L之間，今測得某病人1mL血液中含葡萄糖0.60mg，相當于＿＿＿＿mmol/L，血糖屬正常、偏高還是偏低？                。

以下說法正確的是  (    )

A．物質所含元素化合價升高的反應叫還原反應

B．在氧化還原反應中，失去電子的元素化合價降低

C．物質中某元素失去電子，則此物質是氧化劑

D．還原劑中必定有一種元素被氧化

下列關于反應類型關系正確的是　　(    )

為達到預期的實驗目的，下列操作正確的是

A．欲配制質量分數為10％的ZnSO₄溶液，將l0 g ZnSO₄·7H₂O溶解在90 g水中

B．欲制備F(OH）₃膠體，向盛有沸水的燒杯中滴加FeCl₃飽和溶液并長時間煮沸

C．為鑒別KCl、AICl₃和MgCl₂溶液，分別向三種溶液中滴加NaOH溶液至過量

D．為減小中和滴定誤差，錐形瓶必須洗凈并烘干后才能使用

有 ① Na₂CO₃溶液  ② CH₃COONa溶液  ③ NaOH溶液各25mL，物質的量濃度均為0.1mol·L^－1，下列說法正確的是

A．3種溶液pH的大小順序是 ③＞②＞①

B．若將3種溶液稀釋相同倍數，pH變化最大的是②

C．若分別加入25mL0.1mol·L^－1鹽酸后，pH最大的是①

D．若3種溶液的pH均為9，則物質的量濃度的大小順序是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  

以惰性電極電解CuSO₄溶液。若陽極上產生氣體的物質的量為0.0100mol，則陰極上析出Cu的質量為（　�。�

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