NaCl、KNO₃兩種物質(zhì)的溶解度曲線如下圖所示。

①t₁℃氯化鈉的溶解度       （27）     硝酸鉀（填“＞”或“＜”或“＝”）；

②圖中a點(diǎn)的含義是          （28）               ；

③若硝酸鉀中含有少量氯化鈉，要提純硝酸鉀可

采用      （29）     的方法。

④某興趣小組做了如下實(shí)驗(yàn)。

  【實(shí)驗(yàn)一】提純NaCl

 請(qǐng)根據(jù)實(shí)驗(yàn)回答下列問題：

Ⅰ.操作①、②、③依次為下圖中的

        （30）         （填序號(hào)）;

Ⅱ.若得到NaCl的產(chǎn)量比實(shí)際值偏低，則可能的原因是      （31）        （填序號(hào)）;

   A．過濾時(shí)濾紙有破損，混合液流入濾液中

   B．蒸發(fā)時(shí)受熱不均勻，有晶體濺出

   C．蒸發(fā)時(shí)，看到有晶體析出，立即停止加熱

   D．溶解15 g含有泥沙的NaCl樣品時(shí)，加入的水量不足

Ⅲ.用上述實(shí)驗(yàn)所得純凈的氯化鈉，配制5%的氯化鈉溶液50 g，需要氯化鈉   （32）     g。

  【實(shí)驗(yàn)二】溶解和結(jié)晶

請(qǐng)根據(jù)硝酸鉀的溶解度和相關(guān)實(shí)驗(yàn)，回答下列問題：

溫度（℃）	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

某興趣小組做了以下實(shí)驗(yàn)：

Ⅳ. 上述溶液中的溶質(zhì)是     （33）        ，上述實(shí)驗(yàn)過程中得到的溶液一定屬于

不飽和溶液的是   （34）    （填數(shù)字序號(hào)），⑤所對(duì)應(yīng)的實(shí)驗(yàn)現(xiàn)象是    （35）    ；

實(shí)驗(yàn)過程中，溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)一定相等的是    （36）       （填數(shù)字序號(hào)）。

Ⅴ.為了防止水體污染，小組同學(xué)提出了如下方案處理實(shí)驗(yàn)后的廢液：

步驟I：將⑤繼續(xù)冷卻至0℃，過濾，共可回收得到KNO₃固體   （37）       g ；

步驟II：將步驟Ⅰ中的濾液（忽略過濾中的損耗）稀釋，可得到    （38）     g溶質(zhì)質(zhì)量分?jǐn)?shù)為1%的KNO₃溶液，用做肥料。

下列數(shù)據(jù)是氯化鈉和氯化鉀固體在不同溫度時(shí)的溶解度．

溫度/℃	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℃時(shí)，KCl的溶解度　　（填“＞”或“＜”）NaCl的溶解度．

（2）20℃時(shí)，向100g水中加入25g氯化鈉，充分溶解后，得到的溶液為　　（填“飽和”或“不飽和”）溶液，溶液中溶質(zhì)質(zhì)量分?jǐn)?shù)為　       　．

（3）20℃時(shí)，進(jìn)行了如下圖所示的實(shí)驗(yàn)．

20℃100g水加KCl20g升溫至40℃升溫至100℃A B 加KCl20gC 加28g KCl恒溫100℃D E

①A～E中，溶液中溶質(zhì)質(zhì)量分?jǐn)?shù)相同的是　         　．

②下列操作能使E溶液中溶質(zhì)質(zhì)量分?jǐn)?shù)變小的是　          　（填字母序號(hào)）．

a．加入2g KCl        b．加入100g 100℃的水      c．降溫至40℃

 

完型填空（共20小題；每小題1分，滿分20分）
閱讀下面短文，掌握其大意，然后從四個(gè)選項(xiàng)（A、B、C和D）中，選出最佳選項(xiàng)。
"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.

【小題1】

A．a(chǎn)s B．when C．while D．before

【小題2】

A．a(chǎn)pplauding B．cheering C．laughing D．quarreling

【小題3】

A．modeling B．writing C．drilling D．a(chǎn)cting

【小題4】

A．in spite of B．in view of C．in terms of D．in front of

【小題5】

A．looked into B．searched for C．wondered about D．glanced at

【小題6】

A．presented B．sent C．rushed D．handed

【小題7】

A．hurt B．beat C．disappointed D．puzzled

【小題8】

A．for B．like C．on D．a(chǎn)fter

【小題9】

A．impress B．make C．consult D．defeat

【小題10】

A．effect B．phenomenon C．challenge D．scene

【小題11】

A．forced B．expected C．reminded D．preferred

【小題12】

A．a(chǎn)pologize B．beg C．hide D．complain

【小題13】

A．consider B．imagine C．a(chǎn)ppreciate D．resist

【小題14】

A．hardly B．ever C．even D．gradually

【小題15】

A．blanket B．bed C．chair D．mirror

【小題16】

A．while B．though C．but D．because

【小題17】

A．right B．still C．therefore D．a(chǎn)nyhow

【小題18】

A．sensitive B．uncomfortable C．different D．tense

【小題19】

A．compare B．a(chǎn)ssociate C．wave D．whisper

【小題20】

A．give up B．end up C．put up D．set up