题目内容

(8分)(1)(4分)实验室在临时配制一些氯化铁溶液时,常将氯化铁固体先溶于较浓的盐酸中,然后再用蒸馏水稀释到所需的浓度,是为了                。氯化铁水溶液呈     性,原因是(用离子方程式表示):                       。
(2)(2分)物质的量浓度均为0.1 mol/L的下列溶液pH 由大到小的顺序            
          (用序号表示)
①CH3COOH  ②NH4Cl       ③NaHCO3    ④Ba(OH)2      ⑤NaOH    ⑥N a2CO3
(3)(2分)物质的量浓度相同的下列溶液按c(CO32)由大到小的顺序是____________
①Na2CO3    ②NaHCO3  ③H2CO3   ④ (NH4)2CO3 ⑤NH4HCO3
(8分)(1)抑(防)止Fe2+水解(1分);
酸性(1分);   Fe3+ + 3H2O Fe(OH)3 + 3H+(2分,写“=”不得分)
(2)④⑤⑥③②①(3)①④②⑤③解析:
练习册系列答案
相关题目

听对话,选择与对话内容相符的图片,将代表图片的字母填在相应的序号后。每段对话读两遍。(共5分,每小题1分)

1.(  ) 2.(  ) 3.(  ) 4.(  ) 5.(  )

二.听对话,根据对话内容,判断第6-10小题所给句子的正误。正确的写T,错误的写F。每段对话读两遍。(共5分,每小题1分)

听第一段对话,判断第6-7小题。

6.Bob has changed a lot.

7.Now Tina has long hair.

听第二段对话,判断第8-10小题。

8.Jim and Alice have to stay at home on school nights.

9.They are allowed to go out on Saturday nights.

10.They are talking outside the classroom at the school.

三.听对话,根据对话内容,从下列各题所给的A、B、C三个选项中,选择最佳选项。每段对话读两遍。(共5分,每小题1分)

听第一段对话,回答第11-12小题。

11.What are the two speakers talking about?

A.Joe’s problem.

B.Mr.Andrews’ problem.

C.Mrs.Wilson’s problem.

12.What is the relationship(关系)between the two speakers?

A.Teacher and student.

B.Mother and son.

C.Parent and teacher.

听第二段对话,回答第13-15小题。

13.How does Mary feel about her new neighbors?

A.She doesn’t like them.

B.She’s mad about their son.

C.She feels silly to talk with them.

14.Which of the following is Mary most worried about?

A.Her children can not get enough sleep.

B.Her new neighbors’ radio makes great noises.

C.She doesn’t know how to deal with her neighbors’ son.

15.What suggestion does the man make?

A.Mary should call up her neighbors to complain.

B.Mary should talk with her neighbors about the problem.

C.Mary should try her best to get her children to sleep early.

四.听短文,根据短文内容,完成下面的表格。短文读三遍。(共10分,每小题2分)

注:chemistry化学;lab实验室

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网