问题 问答题

(I)下列有关实验的叙述中,合理的是______(填序号)

A.把SO2通入紫色石蕊试液,可验证SO2的漂白性

B.一学生用pH试纸测得某氯水的pH为2

C.不宜用瓷坩埚灼烧氢氧化钠或碳酸钠

D.将10g ZnSO4•7H2O溶解在90g水中配制10%的ZnSO4溶液

E.向某溶液中滴加氯化钡溶液,产生不溶于稀硝酸的白色沉淀,则该溶液中一定含有SO2-4

F.配制一定物质的量浓度的溶液,定容时俯视容量瓶的刻度线,会使所配溶液浓度偏高

(II)(二氯化硫(SCl2)熔点-78℃,沸点59℃.密度1.638g/mL.遇水易分解二氯化硫与三氧化硫作用可生成重要化工试剂亚硫酰氯(SOCl2).以下是由氯气与硫反应合成二氯化硫的实验装置.

回答下列问题:

(1)装置B盛放的药品是______C中是______

(2)实验开始前先在D中放入一定量的硫粉,加热使硫熔化,然后转动和摇动烧瓶使硫附着在烧瓶内壁表面形成一薄层,这样做的目的是______

(3)实验时,D装置需加热至50-59℃,最好采用何种方式加热______.为了防止E中液体挥发,可以采取的措施______.

(4)F装置中干燥管内所盛物质是______的作用是:______.

答案

(I)A.SO2具有漂白性和酸性即还原性等,能使品红褪色,把SO2通入紫色石蕊试液中,会变红色,故A错误;

B.氯水为氯气的水溶液,显酸性,其中的次氯酸有漂白性,不能用pH试纸测,故B错误;

C.氢氧化钠或碳酸钠和二氧化硅能反应,不宜用瓷坩埚灼烧氢氧化钠或碳酸钠,故C正确;

D.w%=

溶质的质量
溶液的质量
×100%,溶液的质量为100g,而溶质ZnSO4的质量小于10g,故D错误;

E.向某溶液中滴加氯化钡溶液,产生不溶于稀硝酸的白色沉淀,则该溶液中可能含有硫酸根或银离子中的至少一种,故E错误;

F.配制一定物质的量浓度的溶液,定容读数时:俯视导致结果偏高,仰视导致结果偏低,故F正确.

故答案为:CF;

(II)(1)制得的氯气不纯,混有氯化氢和水,除去氯化氢用饱和食盐水,除水用浓硫酸,故答案为:饱和食盐水;浓硫酸;

(2)由粉末状变为一薄层,增大了反应接触面积,能加快反应速率,使反应充分,故答案为:增大反应接触面积;

(3)需加热至0-100℃,最好采用水浴加热的方式,二氯化硫(SCl2)熔点-78℃,可以将锥形瓶放入冰水中冷却,防止E中液体二氯化硫(SCl2)挥发,故答案为:水浴加热;将锥形瓶放入冰水中冷却;

(4)二氯化硫遇水易分解,要用吸水剂隔绝空气中水的干扰,故答案为:碱石灰(或固体氢氧化钠或生石灰);防止空气中水蒸气进入并吸收残留余的氯气.

完形填空
完形填空。
     This past Christmas was one of the best I have ever had. This was made possible by my sister, Amy.
She is eight years older and has already made it into "real world".
     My sister bought me three wonderful gifts, ___ 1___only one would capture(俘虏)my heart forever.
First she handed me the 2  . Because Amy is  3  with her actions,I knew this was her least favorite. It was
a bottle of perfume(香水). 1 was happy with it, yet  4  as to what lay ahead. Next she handed me a box.
After  5  away the wrapping paper, I found a stylish(时髦的)and 6  sweater. I was deeply moved that my
sister was so generous(大方的). Then she handed me the  7  gift. Judging by me familiar size and  8  ,I
knew it was a CD. It was the soundtrack to the movie"Rocky",with songs inspiring to all athletes. dreamers…I 9  loved it,but not as much as 1 would after what my sister explained to me.
     She was  10  to a knee injury that  11  me half of my soccer. season. I desired to be with my
team-mates and 12  each minute I sat on the bench. I tried hard, hoping my knee injury would become
well soon. This was what led my sister to buying that CD.
     After mentioning what was behind the  13  ,Amy played the CD for me. Even though I had heard those
songs a thousand times,each note  14  me as If it was new. It played in my soul and on my emotions. I
  15  breathlessly, as the words"Trying hard now. It's so hard now. "sounded through the room. It touched me in a way  16  me happiness most gifts could bring. I couldn't  17  crying and hugged my sister. Knowing
that my sister had  18  my problem so deeply made me realize that I am the    19  little sister in the world.
I had never received a gift with so much  20  behind it! I'll cherish(珍惜)it forever.
( ) 1.  A. so    
( ) 2.  A. smallest
( ) 3.  A. painful
( ) 4.  A. anxious
( ) 5.  A. putting
( ) 6.  A. natural
( ) 7.  A. rest
( ) 8.  A. color   
( ) 9.  A. immediately
( )10.  A. explaining
( )11.  A. paid
( )12.  A. enjoyed
( )13.  A. gift
( )14.  A. beat
( )15.  A. 1istened
( )16.  A. before
( )17.  A. burst   
( )18.  A. found   
( )19.  A. 1uckiest
( )20.  A. hardship
B. but    
B. prettiest  
B. pitiful  
B. excited    
B. tearing    
B. suitable  
B. 1ast    
B. style    
B. quickly    
B. replying  
B. stopped    
B. valued    
B. story    
B. struck    
B. danced  
B. under    
B. hold    
B. got    
B. cleverest  
B. thought    
C. as   
C. dearest
C. careful
C. delighted
C. carrying
C. beautiful
C. other   
C. pattern
C. suddenly
C. referring
C. took
C. suffered
C. sweater
C. followed
C. 1aughed
C. above   
C. help
C. felt
C. bravest
C. money   
D. for          
D. 1argest      
D. helpful      
D. curious      
D. giving        
D. expensive    
D. favorite      
D. shape        
D. secretly      
D. talking      
D. cost          
D. spent        
D. holiday      
D. led          
D. remembered    
D. beyond        
D. prevent      
D. solved        
D. best          
D. experience    
单项选择题