问题 填空题

下图为甲、乙两种固体物质的溶解度曲线,请回答:

(1)t1℃时,甲、乙两种固体物质的溶解度大小关系为甲   乙(填“>”“<”“=”)。

(2)t1℃时,把50g甲物质放入100g水中,充分搅拌,所得溶液是         溶液(填“饱和”或“不饱和”),将温度升高到t2℃时,该溶液中溶质和溶剂的质量比是       

(3)t2℃时,有一接近饱和的甲溶液,可采用                的方法(任写一种)使其变为饱和溶液。

答案

(4分)⑴>;⑵饱和;1:2;⑶降温(或加入甲物质或蒸发溶剂)

(1) 从图像看t1℃时,甲的溶解度曲线在上面所以甲的溶解度大;

(2)从图像看t1℃时,甲的溶解度是40g,所以该温度下100g水中最多溶解40g甲,所以t1℃时,把50g甲物质放入100g水中所得溶液为饱和溶液;t2℃时,甲的溶解度为60g,此时50g甲全溶解,所得溶液中溶质质量为50g,溶剂为100g。

(3)甲的溶解度随温度的升高而增大,所以降低温度能使t2℃时近饱和的甲溶液变为饱和溶液,蒸发溶剂和增加溶质甲都可以使其饱和。

单项选择题
阅读理解

A jobless man applied for the position of “office boy”at Microsoft.The HR manager interviewed him and then watched him cleaning the floor as a test.

“You are employed.”he said.”Give me our e-mail address and I’ll send you the application to fill in ,as well as date when you may start.”

The man replied,”But Idon’t have a computer,neither an e-mail.”

“I’m sorry,”said the HR manager,”If you don’t have an e-mail,that means you do not exist.And who doesn’t exist cannot have the job.”

The man left with no hope at all.He didn’t know what to do, with only ten dollars in his pocket.He then decided to go to the supermarket and buy 10kg tomatoes.He then sold the tomatoes from door to door.In less than two hours,he succeded to double his capital,He repeated the operation three times,and returned home happily with 60 dollars.

The man realized that he can survive in this way,and started to go every day earlier,and return late,Thus,his money doubled or tripled every day.Shortly,he bought a cart,then a truck,and then he had his own fleet of delivery vehicles.Five years later,the man is one of the biggest food retailers in the US.

He started to plan his family’s future and decided to have a life insurance He called an insurance broker and chose a protection plan.

When the conversation was concluded the broker asked him his e-mail,The man replied,”I don’t have an e-mail.”

The broker answered curiously,”You don’t have an e-mail,and yet have succeeded to build an empire.Can you imagine what you could have been if you had an e-mail?”The man thought for a while and replied,”Yes,I’d be an office boy at Microsoft!”

小题1:Why can’t the man have the job at Microsoft?

A.Because he didn’t have an e-mail

B.B Because he was lazy.

C.Because he didn’t pass the test

D.Because he didn’t have a computer小题2:The underlined word “triple”can be replaced by_______.

A.become 3 times

B.become large

C.increase quickly

D.decrease quickly小题3:According to the passage,which of the following is TRUE?

A.The man is one of the biggest food retailers in the world.

B.The man didn’t give up though he failed the interview.

C.He started his career by selling tomatoes in the supermarket.

D.Those who have e-mails can work at Microsoft.小题4:The man can be described as ______.

A.helpful and considerate

B.smart and hardworking

C.positive and generous

D.stubborn and unselfish小题5:Which proverb can best describe the story?

A.Where there is a will,there is a way.

B.Accidents will happen.

C.Misfortune may be an actual blessing.

D.No pains,no gains.