问题 填空题

W、X、Y、Z是原子序数依次增大的同一短同期元素,W、X是金属元素,Y、Z是非金属元素.

(1)W、X各自的最高价氧化物对应的水化物可以反应生盐和水,该反应的离子方程式为______.

(2)W与Y 可形成化合物W2Y,该化合物的电子式为______.

(3)Y的低价氧化物通入Z单质的水溶液中,发生反应的化学方程式为______.

(4)比较Y、Z气态氢化物的稳定性______>______(用分子式表示).

(5)Y、Z四种元素简单离子的离子半径由大到小的顺序是______>______>______>______.

答案

(1)W、X为金属,其最高价氧化物对应的水化物为碱,且两种碱可以反应生成盐和水,则为NaOH和Al(OH)3,二者反应的离子方程式:Al(OH)3+OH-=AlO2-+2H2O,故答案为:Al(OH)3+OH-=AlO2-+2H2O;(2)W为Na,W可以和Y形成W2Y,则Y为-2价,为ⅥA元素,且和钠同周期,所以为S.W2Y为Na2S,电子式为:

,故答案为:

(3)Y的低价氧化物为SO2;并且Z和Y同周期,原子序数比Y大,所以Y为Cl.Y的低价氧化物和Z的单质反应的方程式:SO2+Cl2+2H2O=H2SO4+2HCl,故答案为:SO2+Cl2+2H2O=H2SO4+2HCl;

(4)非金属性越强,气态氢化物的稳定性越强;由于非金属性:Cl>S,所以气态氢化物的稳定性:HCl>H2S,故答案为:HCl>H2S.

阅读理解

Dear Parents,

It is almost a week since school began. I hope that you and your child are settled and comfortable in the arrangement of the new school year. I would like to take this opportunity to give you news about the art project that the eighth grade students and I will be working on during this unit. 

My name is Molly Atkinson and I am a new middle school teacher here at MSAE in Kauai. I feel that it is important for you to know that my approach to classroom management is inspired by Maharishi’s Principle of Ideal Teaching. I believe that it is the most positive method for guiding our students’ education. I also believe that by keeping the lessons interesting, the classroom will be a creative environment for the students to explore the artistic process. My experience with the class this week makes me believe that the students and I will have a fruitful and caring experience in our time together.

The students’ first project is a three-part work that begins with the creation of a collage (拼贴画). A pencil drawing of the collage will follow. The third part of the project will be a geometrical three-dimensional (几何三维的) drawing of the collage. The students have jumped right into the project with enthusiasm (热情) and focus. I can tell that we are going to have a very productive unit.

On October 30th, the students will have a showing of their work for you. I look forward to meeting all of you that day. If you would like to get hold of me before that time I will be here after school until 4:30 on Mondays and Wednesdays and can be available on other afternoons by appointment (预约). I may also be reached at my e-mail address: matkinson@kdsi.net. I am very happy to be here and look forward to working with the eighth grade students.

Sincerely,

Molly Atkinson

小题1:It can be learned that the letter was written _____.

A.after the school year ended

B.before the new school year started

C.in the middle of the school year

D.at the beginning of the new school year小题2:The letter was most probably written by _____. 

A.an art teacher

B.an eighth grader

C.a school gardener

D.a head teacher小题3:In Paragraph 2, Atkinson mentions _____.

A.her long work experience

B.her close relationships with the students

C.the teaching method she applies

D.the training aim of the new term小题4:The underlined words “that time” in the last paragraph refer to _____.

A.October 30th

B.4:30 on Mondays

C.4:30 on Wednesdays

D.other afternoons

单项选择题 共用题干题