问题 填空题

在2008年初我国南方遭遇的冰雪灾害中,使用了一种融雪剂,其主要成分的化学式为XY2,X、Y均为周期表前20号元素,其阳离子和阴离子的电子层结构相同,且1 molXY2含有54 mol电子。

(1)该融雪剂的化学式是_________;X与氢元素形成的化合物的电子式是_________。

(2)元素D、E原子的最外层电子数是其电子层数的2倍,D与Y相邻,则D的离子结构示意图是_________;D与E能形成一种非极性分子,该分子的结构式为_________;D所在族元素的氢化物中,沸点最低的是_________。

(3)元素W与Y同周期,其单质是原子晶体;元素Z的单质分子Z2中有3个共价健;W与Z能形成一种新型无机非金属材料,其化学式是_________。

(4)元素R与Y同主族,其氢化物能用于刻蚀玻璃,R2与NaOH溶液反应的产物之一是OR2,该反应的离子方程式为__________________。

答案

(1)CaCl2

(2)S=C=S;H2S

(3)Si3N4

(4)2F2+2OH-=2F-+OF2+H2O

阅读理解

阅读理解

     Wugging, or web use giving, describes the act of giving to charity at no cost to the user. By using

Everyclick.com, which is being added to a number of university computers across the UK, students can

raise money every time they search, but it won't cost them a penny.

     Research shows that students are extremely passionate about supporting charity - 88% of full time

students have used the Internet to give to charity. This age group is often the least likely to have their own

income. 19% of 22 to 24 year olds have short-term debts of more than ?5,000. With rising personal debt

levels in this age group, due to university tuition fees or personal loans and a lack of long-term savings,

traditional methods of donating to charity are often not appealing (有感染力的) or possible.

     Beth Truman, a 21 year old recent university graduate, has used Everyclick.com to donate to her

chosen charity, the RSPCA, for two years and has seen the "wugging" movement grow in popularity with

students. "When you're at university you become more socially aware, but it's sometimes hard to give to

others when you have little money yourself," says Beth. "Wugging is great for people in this age group as it allows them to use the technology on a daily basis to give to charity, without costing them a single penny."

     Wugging is perfect for people who want to be more socially aware and supportive but don't feel they

have the means to do so. Students using the web can raise money for causes they care about without

costing them anything in terms of time or money, and charities get a valuable source of funding.

     Everyclick.com works like any other search engine, allowing users to search for information, news and

images but users can decide which of the UK's 170,000 charities they would like to support through their

clicks. Everyclick.com then makes monthly payments to every registered charity. Launched in June 2005, Everyclick.com is now the eighth largest search engine and one of the busiest charity websites in the UK.

1. What does "wugging"show According to the passage?

A. a website  

B. a school organization  

C. a student movement  

D. a charity-related action

2. In the case of charity, Everyclick.com ______.

A. receives much money from students    

B. offers valuable information to students

C. frees students of the financial worries    

D. praises students for their money-raising

3. What does we think of the "wugging" movement?

A. It makes Everyclick.com popular in the UK.

B. It becomes easy to do charity because of it.

C. It results in students' more social awareness.

D. It helps students to save money.

4. From the passage, we can inferred that ______.

A. "wugging" is a win-win idea for both students and charities

B. most full time students do charity on the Internet every day

C. Everyclick.com helps students pay for the college education

D. Everyclick.com is the most successful search engine in the UK

5. What's the general idea of this passage?

A. "Wugging", a new popular term on the Internet.

B. More Britain charities benefit from the Internet.

C. Students raise money for charity by "wugging".  

D. British people show strong interest in charity.

单项选择题