问题 实验题

9分)常见的食品脱氧剂多为无机铁系脱氧剂,其主要成分为活性铁粉。脱氧中的一步主要反应为:4Fe(OH)2+ O2+ 2H2O = 4Fe(OH)3 (红褐色固体)

小题1:Fe(OH)2读作           ;此反应的基本类型是            

小题2:某同学用食品脱氧剂(2g铁粉、0.5g活性炭、0.5g食盐)进行如下两个实验:

实验Ⅰ:

请回答:①操作Ⅰ的名称是      ,       

②溶液丙中含有的阳离子是                   (写微粒符号)

实验Ⅱ:将乙洗涤烘干后,二氧化碳通过灼热的乙生成丁。

进行如下实验,物质之间的转化关系如下图(部分产物略去)。

①金属A与B的活动性:A       B(填“﹥”“﹤”或“﹦”);

②区别有色溶液C与有色溶液D的方法是                                     

                                      

③反应①③的化学方程式为:                                              

④向溶液C中加入BaCl2溶液,有白色沉淀产生。其化学方程式为                    

答案

小题1:氢氧化亚铁    化合反应

小题2:

实验Ⅰ:过滤   Fe2+  、Na+、 H+  

实验Ⅱ:①  >

②观察溶液颜色,浅绿色为FeSO4溶液,蓝色为CuSO4溶液(或分别取两种溶液,分别加入NaOH溶液,最后有红褐色沉淀的是FeSO4溶液,有蓝色沉淀的是CuSO4溶液) (若区别的是FeCl2和CuCl2,方法正确也给分)

③Fe2O3+3CO2Fe+3CO2  、  CuSO4 + 2NaOH = Cu(OH)2↓ + Na2SO4  

④CuSO4 + BaCl="====" BaSO4↓ + CuCl2

小题1:Fe(OH)2读作氢氧化亚铁;此反应中,反应物是多种,生成物是一种,属于化合反应.

小题1:溶液丙中含有的溶质有:反应生成的硫酸亚铁,原来的氯化钠,还有没有反应的硫酸, 含有的阳离子是Fe2+  、Na+、 H+

①A能够置换出盐溶液中的B,说明A比B活泼.故填:>.

②区别溶液C与溶液D物质的方法是:观察溶液颜色,浅绿色为FeSO4溶液,蓝色为CuSO4溶液.

③三氧化二铁和一氧化碳反应能生成铁和二氧化碳,硫酸铜和氢氧化钠反应能生成氢氧化铜沉淀和硫酸钠

④硫酸铜和氯化钡反应能生成硫酸钡沉淀和氯化铜

写作题
阅读理解

阅读理解

     Skinner Creek ESL Guest Ranch offers a unique outdoor adventure camp for inter- national students.

     Students who come to Skinner Creek have the opportunity to learn English in an environment entirely

different from a regular school setting. English classes are designed to meet the academic and spoken

levels of each student. All English classes will be taught by instructors qualified in Teaching English as a

Second Language. All levels of English are available.

     After class, students can enjoy many outdoor activities in a controlled safe environment. Experienced

managers and camp teachers will prepare each activity to the level appropriate for each student.

     Students' safety is a priority (优先考虑的事) for the staff of Skinner Creek ESL Guest Ranch.

Students are monitored at all times and supervisors are in the cabins with the students at night. An

emergency clinic is nearby and accessible 24 hours.

     English Classes:

     Class hours are from Monday to Friday, 9:00 a. m.-- 2:00 p.m. with a one-hour break for lunch.

     Students are challenged in reading, writing, grammar, vocabulary building and conversational English.

     Vocabulary is specific to related outdoor activities in some classes.

     Fun after-class outdoor and evening activities:

     Great after-class activities on site include: horseback riding lesson, hiking, base ball, volleyball,

badminton, mountain hiking, bonfires (篝火) and much more.

     Time to watch videos and TV and play games.

     Experience Canadian family life.

     Weekends:

    Special all-day and overnight weekend activities include: camping, days at the lake (fishing, swimming,

boating), church and more.

    Travel Information:

    Students will be picked up in cars at Vancouver airport and dropped off again for their individual flights. Transportation to and from the ranch (农场) will be provided as well as overnight stays in Vancouver.

Please contact the ranch directly for prices: skinnercreek@telus, net.

1. If you attend Skinner Creek Summer Camp, you will ______.

A. study English in some regular schools.

B. learn how to deal with dangers in the wild

C. enjoy different sports activities after class

D. experience the traditional farmer lifestyle

2. How many hours of English classes do students have every week in Skinner Creek?

A. 35 hours.      

B. 28 hours.    

C. 25 hours.    

D. 20 hours.

3. Skinner Creek ESL Guest Ranch is in ______.

A. Canada        

B. America        

C. England    

D. Australia

4. How will most students travel to Skinner Creek if they want to attend the camp?

A. By air.      

B. By car.         

C. By boat.    

D. By train