问题 填空题

学完溶液知识后,小松回家用蔗糖、碳酸钙、植物油、洗涤剂、水相互混合做了几个小实验。

(1)在同一条件下,蔗糖易溶于水,难溶于植物油,碳酸钙不能溶于水,也不能溶于植物油。由此说明物质的溶解能力与____和____有关。

(2)除(1)中的因素外,你认为固体物质的溶解能力还与外界条件________________有关。小松设计实验方案验证(2)中假设时,在确定了溶质和溶剂种类的前提下,你认为还需要控制的变量有_______________________________________________________________。

(3)一天,小松不小心将碘酒洒到衣服上,他妈妈立即用水和洗洁精清洗衣服,但怎么洗也洗不掉这些斑点,还足小松给妈妈出了个好主意。你认为应该采用的方法是________________________ 。这种方法和用洗洁精除油污的方法比较,在原理上有什么不同?_________________________________________。

答案

(1)溶质的性质;溶剂的性质

(2)温度;溶剂的量

(3)将有斑点的部分浸泡在酒精(或汽油)中用酒精除去斑点,是使污渍溶解于酒精中,形成的是溶液;而用洗洁精除去油污,是洗洁精中的表面活性剂使油污以细小的液滴形式分散在水中,形成的是乳浊液。

单项选择题 A1型题
阅读理解

阅读理解。

     As women in the rich Asian country have become better educated, with five times as many now

getting advanced degrees as in 1995, they have also become choosier and are less likely to settle for

the role of gentle wife traditionally expected of Korean women.

     "I heard if you are a female with master's degree, it is much harder to arrange a meeting than if you

have a bachelor's degree because of an unfavorable concept 'too smart women' here," said King, a

college senior in Seoul.

     The age at which Korean women are getting hitched has risen by an average 4. 1 years over the

past 20 years to 28. 9 years, according to Statistics Korea, and that has created worried mothers

getting things rolling for their daughters.

     "My daughter is in her early 30's, an age considered late for marriage here", said a woman who

took her daughter to a match-making agency in Seoul.

     "If she does not find her match this year, it will be much more difficult to marry in the coming years.

So I went to the firm with her and made her join. "

     At DUO, a matchmaking firm, its 26, 000 members can choose between five different membership

programs with fees from 1. 08 million won( 韩元)($971) to 8. 8 million won.

     To attract more customers, the site displays the average annual income of its male and female

customers, as well as their professional standing.

     "In a privately set-up blind date, you cannot be entirely sure of how much of personal information

given to you is accurate," said DUO spokesman Yon Jun.

     Critics say the industry focuses more on income and status. Some of them have coined the phrase

"employage" to sum up employment and marriage.

     "If your father works in the financial industry or is a high-ranking administrator, maybe you will find

your match with similar backgrounds through a matchmaking firm, starting a perfect marriage on the

back of parental support," said comedian Quan.

1. The underlined word "hitched" in Paragraph 3 probably means ______.

A. employed    

B. married      

C. educated      

D. worried

2. What leads to the embarrassing state for Korean women in matchmaking is that           .

A. they don't want to be gentle any more

B. most of them are not in good shape

C. they have a much higher education

D. matchmaking agencies pushed them too hard

3. From the passage, we can conclude that           .

A. all the perfect marriages result from good backgrounds

B. blind date can help you get more accurate personal information

C. mothers are more worried about themselves than their daughters

D. twenty years ago, girls averaged less than 25 when they were married

4. Why do some people invent the word "employage"? Because           .

A. they like the special way that matchmaking is arranged

B. the matchmaking firm pays more attention to money and status

C. mothers are more worried about their daughters in marriage

D. young women prefer personal information to profession