问题 填空题

如图是甲、乙两种固体物质的溶解度曲线.

(1)30℃时,甲的溶解度______乙的溶解度(填大于、等于或小于);

(2)要使饱和的甲溶液变为不饱和溶液,可采取的方法是______(只填一种);

(3)在20℃时,把甲、乙各10g固体分别加入到两个盛有50g水的烧杯中,充分搅拌,所得甲溶液为______溶液(填饱和或不饱和);若将温度都升高到30℃,甲溶液中溶质的质量分数______乙溶液中溶质的质量分数(填大于、等于或小于).

(4)10℃时,向12%的100g甲溶液中加水60g,可得到甲溶______g,此时溶质的质量分数为______%.

答案

(1)由两物质的溶解度曲线不难看出,在30℃时,甲的溶解度大于乙的溶解度,故答案为:大于

(2)由于甲的溶解度随温度的升高而增大,因此要使甲的饱和溶液变为不饱和溶液,可以通过升温或者增加溶剂的方法,故答案为:升温

(3)由于在20℃时,两物质的溶解度都大于20克,即把甲、乙各10g固体分别加入到两个盛有50g水的烧杯中,充分搅拌,所得溶液都是不饱和溶液,溶液中溶质的质量分数都相等,由于两物质的溶解度都随温度的升高而增大,若将温度都升高到30℃时,两溶液都还是不饱和溶液,溶质的质量分数没发生变化,故答案为:不饱和,等于

(4)由于是向溶液中加水稀释,在稀释的过程中溶质的质量不变,得到的稀溶液的质量应为浓溶液的质量加上水的质量,所以所得溶液的质量为:100g+60g=160g,所得溶液中溶质的质量分数为

100g×12%
100g+60g
×100%=7.5%,故答案为:160,7.5%

阅读理解
阅读表达。
    A man had a little daughter-an only and much-loved child. He lived for her. So
when she became ill, he became a crazy man. He tried everything to bring her health
back.
    However, his efforts didn't work and the child died. The father was really sad,
shutting himself away from his friends and refusing to do any activity. He didn't
want anything to bring him back to his normal self until one night he had a dream.
        
     He was in heaven and saw a group of all the little children angels (天使). They were walking in a line. All
the angels were wearing white clothes and each child carried a candle (蜡烛). He noticed that one child's
candle was not lighted (点燃). Then he saw that the child was his little girl. ______ he rushed to her right away
and put her into his arms. He kissed her and then asked, "Why is your candle alone unlighted, darling?"
     "Daddy, they often light it again, but your tears always put it out."
     Just then he woke up from his dream. The lesson was clear, and its effects were quick. From that hour on,
he was not a sad father. He became cheerful with his friends. His darling's candle would not longer be put out
by his useless tears. The father was too sad to communicate with others and to do anything.
1. 从文中找出与下句意义相近的句子。
    The father was too sad to communicate with others and to do anything.
    ____________________________________________________________________
2. 根据短文内容,在空白处填上一个合适的连词。
    ____________________________________________________________________
3. 根据短文内容,回答问题。
    Why did the father become cheerful at last? 
    ____________________________________________________________________
4. 将文中画线句子译成汉语。 
    ____________________________________________________________________
5. 根据短文内容,写出文章的标题。(7个词以内) 
    ____________________________________________________________________
实验题