问题 填空题

(13分)X、Y和W为原子序数依次递增的短周期元素,X和Y同主族,Y和W的气态氢化物具有相同的电子数,X的单质只有氧化性。

(1)写出实验室制取W2反应的离子方程式__________________________。

(2)某小组设计如图所示的装置图(图中夹持和加热装置略去),分别研究YX2和W2的性质。

①分别通入YX2和W2,在装置A中观察到的现象是否相同(填“相同”或“不相同”)__________;若装置D中装的是铁粉,当通入W2时观察到的现象为_______________________;若装置D中装的是催化剂,当通入YX­2时,打开K通入适量X­2,化学反应方程式为__________________________________;

②若装置B中装有5.0mL 1.0×10-3mol/L的碘水,当通入足量W2完全反应后,转移了5.0×10-5mol电子,该反应的化学方程式为__________________。

(3)某同学将足量的YX2通入一支装有氯化钡溶液的试管,未见沉淀生成,向该试管中加入过量(填字母)________________,可以看到白色沉淀生成,其原因分别为_________________________________________________。

A.氨水

B.稀盐酸

C.稀硝酸

D.氯化钙(4)若由元素Y和X组成—2价酸根Z,Z中Y和X的质量比为Y:X=4:3,当W2与含Z的溶液完全反应后,有浅黄色沉淀产生,取上层清液加入氯化钡溶液,有白色沉淀产生,该反应的离子方程式为____________________________。

答案

(1)MnO2+4H -+2Cl-Mn2++Cl2↑+2H2O…………………………2分

(2)①相同 产生棕黄色的烟……………………………………………2分

2SO2+O22SO2…………………………………………………2分

②5Cl2+l2+6H2O=2HlO3+10HCl………………………………2分

(3)A C 当加入氨水时,使该溶液变为碱性,产生BaSO3白色沉淀;当加入HNO3时,使溶液中H2SO3氧化成H2SO4,产生BaSO4白色沉淀。……………3分

(4)S2O23-+Cl2+H2O=SO2-4+S↓2Cl-+2H-…………………………2分

完形填空

SECTION B

Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.

I remember my dad teaching me the power of language at a very young age. Not only did he understand that specific  36  can affect our mental pictures, but he understood that words are a  37  programming factor in lifelong success.

One particularly unforgettable event occurred when I was eight. As a child, I was always climbing trees, poles and  38  around upside down from the rafters(屋椽) of our lake house.  39 , it came to no surprise for my dad to find me at the top of a 30-foot tree, swinging back and forth. My little eight-year-old  40  didn’t realize that the tree could break or I could get hurt. I just thought it was enjoyable to be up so high. My older cousin, Tammy, was also hanging in the same tree. Her mother also  41  us at exactly the same time as my dad did. About that time, a huge gust(一阵) of wind blew through the tree. I could hear the leaves rustle(嘎嘎地响) and feel the tree begin to sway. I remember my dad’s  42  over the wind, “Bart, Hold on tightly!”So I did.

The next thing I heard was Tammy’s mother yelling, “Tammy, don’t fall!” Tammy did  43  . My dad later explained to me that the mind has a very  44 time processing a negative image. It takes seventeen positive statements to offset(抵消) one negative statement. That means it might  45  seventeen compliments(贺词/道贺) to offset the emotional  46  of one criticism.

These are concepts that are especially useful in developing yourself. How many compliments do you give yourself daily and how often do you criticize yourself? Try to  47  yourself a lifetime of positive programming by complimenting yourself, or at least think about the kind of programming you are doing to yourself on a daily basis. Remember: try to make positive self-talk a daily practice and you will succeed some day.

36. A. reactions             B. behaviors                 C. words                  D. expressions

37. A. doubtful                B. sensible                    C. strange                     D. powerful

38. A. sitting                 B. hanging                    C. standing                   D. lying

39. A. However             B. Furthermore             C. Moreover                 D. Therefore

40. A. brain                  B. memory                   C. experience                D. knowledge

41. A. believed                 B. noticed                     C. protected                  D. persuaded

42. A. voice                  B. figure                      C. image                      D. anger

43. A. hold                   B. think                       C. fall                          D. regret

44. A. surprising           B. relaxing                   C. difficult                   D. short

45. A. offer                  B. take                         C. give                         D. Keep

46. A. damage               B. danger                            C. award                      D. relief

47. A. stop                    B. consult                     C. imagine                    D. give

单项选择题