问题 填空题

在9.5克某二价金属的氯化物中含有0.2摩Cl-,此氯化物的摩尔质量为___________该金属元素的相对原子质量为_________________。

答案

(6分)  95g·mol-1, 24

考查物质的量的有关计算。

二价金属氯化物中,氯离子的物质的量是0.2mol

则该氯化物的物质的量是0.1mol

所以此氯化物的摩尔质量为9.5g÷0.1mol=95g·mol-1

因此该金属元素的相对原子质量为95-35.5×2=24

选择题
阅读理解

Customs are social habits. They have been handed down through generations (代) among groups, social classes, etc. Customs can be described as ways of doing things. They are particularly (特别) strong in social practices on the occasions (场合) of births, marriages and deaths.

In China, these days, some people in cities are learning from Western customs. For example, some brides dress in the long white dress that is usual bridal wear in many Western countries.

Every people (民族) has special customs for New Year. The Han people have many interesting Spring Festival customs. And now, quite a number of people living in the cities have followed the Western customs of sending New Year greeting cards for January 1st.

One interesting custom in China is that mothers wrap (包) up their babies tightly (紧紧的).This is not the custom in Western countries, where babies are usually dressed in loose garments.

6. It is true that customs      .

A. have been formed during a short time

B. have been formed little by little

C. have been quickly formed and changed

D. have never been changed

7. In this passage, the word “garment” is      .

A. a kind of food        B. a bed

C. a sort of clothes     D. a room

8. How do the Chinese young people learn from Western countries at their marriages?

A. The brides(新娘)have on the white clothes.

B. Men wear the white coats.

C. Their parents all have attended their marriages.

D. Their marriages are only held in the men’s homes.

9. From this passage we know      .

A. the people all over China spend New Year in the same way

B. people in the villages and cities send New Year greeting cards to each other

C. each people has his special custom for New Year

D. most of Chinese people take Spring Festival seriously

10. The difference about clothing between Chinese and Western babies is that      .

A. Chinese babies are usually dressed in new clothes

B. Chinese mothers are used to dressing their babies in colourful clothes

C. Western babies are dressed in bigger clothes while Chinese babies are usually wrapped

D. Western babies have more clothes than Chinese babies