33．C 34．A 35．B 36．D 37．C 38．A 39．C 40．D——青夏教育精英家教网—

NaCl、KNO₃两种物质的溶解度曲线如下图所示。

①t₁℃氯化钠的溶解度（27）硝酸钾（填“＞”或“＜”或“＝”）；

②图中a点的含义是（28）；

③若硝酸钾中含有少量氯化钠，要提纯硝酸钾可

采用（29）的方法。

④某兴趣小组做了如下实验。

【实验一】提纯NaCl

请根据实验回答下列问题：

Ⅰ.操作①、②、③依次为下图中的

（30）（填序号）;

Ⅱ.若得到NaCl的产量比实际值偏低，则可能的原因是（31）（填序号）;

A．过滤时滤纸有破损，混合液流入滤液中

B．蒸发时受热不均匀，有晶体溅出

C．蒸发时，看到有晶体析出，立即停止加热

D．溶解15 g含有泥沙的NaCl样品时，加入的水量不足

Ⅲ.用上述实验所得纯净的氯化钠，配制5%的氯化钠溶液50 g，需要氯化钠（32） g。

【实验二】溶解和结晶

请根据硝酸钾的溶解度和相关实验，回答下列问题：

温度（℃）	0	10	20	30	40	50	60
溶解度（g/100g水）	13.3	20.9	31.6	45.8	63.9	85.5	110．0

某兴趣小组做了以下实验：

Ⅳ. 上述溶液中的溶质是（33），上述实验过程中得到的溶液一定属于

不饱和溶液的是（34）（填数字序号），⑤所对应的实验现象是（35）；

实验过程中，溶液中溶质的质量分数一定相等的是（36）（填数字序号）。

Ⅴ.为了防止水体污染，小组同学提出了如下方案处理实验后的废液：

步骤I：将⑤继续冷却至0℃，过滤，共可回收得到KNO₃固体（37） g ；

步骤II：将步骤Ⅰ中的滤液（忽略过滤中的损耗）稀释，可得到（38） g溶质质量分数为1%的KNO₃溶液，用做肥料。

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下列数据是氯化钠和氯化钾固体在不同温度时的溶解度．

温度/℃	0	20	40	60	80	100
溶解度/g	NaCl	35.7	36.0	36.6	37.3	38.4	39.8
KCl	27.6	34.0	40.0	45.5	51.1	56.7

（1）在0～20℃时，KCl的溶解度　　（填“＞”或“＜”）NaCl的溶解度．

（2）20℃时，向100g水中加入25g氯化钠，充分溶解后，得到的溶液为　　（填“饱和”或“不饱和”）溶液，溶液中溶质质量分数为　　．

（3）20℃时，进行了如下图所示的实验．

20℃100g水加KCl20g升温至40℃升温至100℃A B 加KCl20gC 加28g KCl恒温100℃D E

①A～E中，溶液中溶质质量分数相同的是　　．

②下列操作能使E溶液中溶质质量分数变小的是　　（填字母序号）．

a．加入2g KCl b．加入100g 100℃的水 c．降温至40℃

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（2013?和平区二模）下列数据是氯化钠和氯化钾固体在不同温度时的溶解度．

温度/℃		0	20	40	60	80	100
溶解度/g	NaCl	35.7	36.0	36.6	37.3	38.4	39.8
溶解度/g	KCl	27.6	34.0	40.0	45.5	51.1	56.7

（1）在0～20℃时，KCl的溶解度

＜

（填“＞”或“＜”）NaCl的溶解度．
（2）20℃时，向100g水中加入25g氯化钠，充分溶解后，得到的溶液为

不饱和

（填“饱和”或“不饱和”）溶液，溶液中溶质质量分数为

20%

．
（3）20℃时，进行了如下图所示的实验．
20℃100g水加KCl20g升温至40℃升温至100℃A B 加KCl20gC 加28g KCl恒温100℃D E

①A～E中，溶液中溶质质量分数相同的是

C D

．
②下列操作能使E溶液中溶质质量分数变小的是

b c

（填字母序号）．
a．加入2g KCl b．加入100g 100℃的水 c．降温至40℃

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完型填空（共20小题；每小题1分，满分20分）
阅读下面短文，掌握其大意，然后从四个选项（A、B、C和D）中，选出最佳选项。
"Hey, Tahlia! How's the model?"
I had just taken a bite of my hot dog __21__ I heard a familiar voice yelling at me from across the crowded school yard. I saw a group of popular girls who were all __22__.
"What kind of __23_ are you going to do? An ad for a Frankenstein movie?" More laughter. My stomach twisted into a tight knot. How could they humiliate (羞辱) me like this, __24__ the entire school? As I walked into the cafeteria, I __25__ the dark scars on my right hand.
At 9 months old, I knocked over a tea pot and dumped boiling water allover my hands and stomach. My parents __26__ me to the hospital, but I had to have skin graft (移植) operation. I was in so much pain! But what __27__ me most were the cruel things people said about how I looked, __28__ that day at lunch.
The girls were being supermean to me because they'd heard I was considering doing some modeling. A close friend had suggested that I shouldn't let my scars limit me and that I might __29__ a good model.
But after that __30__ at school, I was sure I'd made a huge mistake. Upon arriving home, I covered the mirror with a blanket, fell on my bed and sobbed.
The next day, I __31__ myself to go to school. At lunch my best friend Jesse tried to encourage me: "You can't __32_ forever, Tahlia. So what if you have a few scars? Just go outside and show them that you're just as good as they are." Although I knew he was right, I couldn’t __33__ standing up for myself like that.
However, that night as I sat on the bed, my friend's words replayed in my mind. I'm __34__ hiding from myself, I thought. How stupid! Slowly, I stood up, walked over to the __35__, and tossed the blanket aside. There, in the mirror I saw a slim, dark-haired, blue-eyed girl, looking just fine, __36__ with a few scars.
The next day I wore a comfortable T-shirt to school. What's more, I had lunch outside the cafeteria, __37__ beside those mean girls. They were shocked that I should dare to walk into their territory. I felt __38_ too—free and happy.
Sometimes people still look at me strangely. They __39_ and stare, but I don't let it get to me. I have applied to several modeling companies, and at least one company is considering me for jobs. Maybe I'll never __40_ posing on the runway, but I do know one thing: I'm done.

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