问题 问答题

某些化学反应可用下式表示A+B→C+D+H2O

请回答下列问题(反应可以是固体之间的反应,也可以是在水溶液中进行的反应):

(1)若A是非金属气态单质,反应后所得溶液常用于消毒、杀菌.则A为______(填化学式下同).反应的化学方程式为______.

(2)若A为非金属固态单质,C、D均为气体且都能使澄清石灰水变浑浊.则A为______.反应的化学方程式为______.

(3)若A为紫红色金属,D为有色气体.则A为______.反应的离子方程式为______.

(4)若A为烧碱溶液,C是相对分子质量为100的白色沉淀,D为正盐.则C为______.反应的离子方程式为______.

(5)若A、B为固体,C的水溶液能使酚酞溶液变为红色.实验室常用此反应制备C气体.则C为______.反应的化学方程式为______.

答案

(1)若A是非金属气态单质,反应后所得溶液常用于消毒、杀菌,该反应是氯气与氢氧化钠的反应,则A为Cl2,该反应化学方程式为:2NaOH+Cl2=NaCl+NaClO+H2O,

故答案为:Cl2;2NaOH+Cl2=NaCl+NaClO+H2O;

(2)若A为非金属固态单质,C、D均为气体且都能使澄清石灰水变浑浊,C、D分别为CO2、SO2中的一种,则该反应为碳与浓硫酸反应,故A为C,反应化学方程式为:C+2H2SO4(浓)

.
CO2↑+2SO2↑+2H2O,

故答案为:C;C+2H2SO4(浓)

.
CO2↑+2SO2↑+2H2O;

(3)若A为紫红色金属,则A为Cu,D为有色气体,该反应为Cu与浓硝酸反应,反应离子方程式为:Cu+4H++2NO3-=Cu2++2H2O+2NO2↑,

故答案为:Cu;Cu+4H++2NO3-=Cu2++2H2O+2NO2↑;

(4)若A为烧碱溶液,C是相对分子质量为100的白色沉淀,为CaCO3,D为正盐,应是碳酸氢钙与氢氧化钠反应生成碳酸钙、碳酸钠与水,反应离子方程式为:2OH-+Ca2++2HCO3-=2H2O+CaCO3↓+CO32-

故答案为:CaCO3;2OH-+Ca2++2HCO3-=2H2O+CaCO3↓+CO32-

(5)若A、B为固体,C的水溶液能使酚酞溶液变为红色,实验室常用此反应制备C气体,则C为NH3,该反应为氢氧化钙与氯化铵反应生成氯化钙、氨气与水,反应化学方程式为:Ca(OH)2+2NH4Cl

.
CaCl2+2NH3↑+2H2O↑,

故答案为:NH3;Ca(OH)2+2NH4Cl

.
CaCl2+2NH3↑+2H2O↑.

阅读理解

Due to the increasing number of violence acts produced in schools all over the world,more and more parents prefer to have their children educated at home rather than at school. This way they can assure their safety and well-being,although teachers and school representatives are trying to improve the situation in schools by increasing the number of the persons in charge with the safety of the students.

The main reason for violence acts are the films and cartoons that fill the children’s time.They want to do everything.they watch on TV and never think at the consequences,and they may hurt a classmate or a teacher.

On the other hand, parents are not fully satisfied with the children’s results obtained in classes and they consider private classes would have better results.

When a teacher has to watch 30 students in class he can’t probably see what each of them is doing,how he is writing,or if he understands the explanations.At home the teacher can explain in details everything the child doesn’t understand as many times as he considers proper.

And many times.the child grows fond of the teacher at home,who becomes his best friend,and who helps him whenever he needs someone to talk to.    

However, the best solution would be a mixture between the education received at school and that at home,because school makes children communicate and socialize.Keeping a child at home for fear there might happen something bad to him.only makes the child’s character weak and prevents him from knowing what real life is.Staying in a crystal ball only does harm to the child.

All in all.schools have been created to help children,not to harm them,so it’s best to keep children in these special places,where they learn,laugh,have fun and make new friends.

小题1:The writer’s purpose in writing the text is to          

A.teach parents the ways to keep theft children safe

B.show solutions to developing children’s character

C.explain the main reason for violence acts in schools

D.analyze an education problem and give opinions小题2:Parents prefer to have their children educated at home because the following EXCEPT that______.

A.More and more violence acts occur in schools

B.Parents want to improve their Children's grades

C.Parents are concerned about their children’s safety

D.The education system is far from satisfactory小题3:What does“a crystal ball”in the passage refer to?

A.A toy that can be used for entertainment.

B.A safe and comfortable environment.

C.An object that is made of crystal.

D.A setback that is hard to overcome.小题4:We call infer from the passage that          

A.violence TV programs have bad effects on children’s behavior

B.The teacher at home is more patient than the teacher at school

C.Children today are weak from lack of sense of right and wrong

D.There are too many students in class for a teacher to teach小题5:Which of the following might be the best title of the passage?

A.Advantages and Disadvantages of Private Classes

B.Who is to Blame, Parents or Schools?

C.Which is Better, School Study or Home Study

D.The Relationship between Teachers and Children

多项选择题

(二)  甲公司适用的所得税税率为25%,甲公司2014 年度与投资相关的交易或事项如下:  (1) 2014 年1 月1 日,从市场上购入2000 万股乙公司发行在外的普通股,准备随时出售,每股成本为8 元,购入时另支付相关税费30 万元。甲公司对乙公司不具有控制、共同控制或重大影响。12 月3 1 日,乙公司股票的市场价格为每股9 元。  (2) 甲公司2014 年1 月1 日购入丙公司同日发行的3 年期公司债券,拟持有至到期。购买该债券共支付价款10560.42 万元(含交易费用50 万元) ,债券面值10000 万元, 每半年付息一次, 付息日为6 月30 日和12 月31 日,到期还本,票面年利率6% ,实际年利率4% 。采用实际利率法摊销。12 月31 日,甲公司持有的该债券市场价格为10400 万元。  (3) 2014 年1 月1 日,购入丁公司发行的认股权证100 万份,成本100 万元,每份认股权证可于两年后按每股5 元的价格认购丁公司增发的1 股普通股。12 月31 日, 该认股权证的市场价格为每份0.6 元。  (4) 2014 年2 月1 日取得戊上市公司100 万股股份,成本为1500 万元,对戊公司不具有控制、共同控制或重大影响。该股份自2014 年2 月1 日起限售期为3 年。甲公司在取得该股份时未将其分类为以公允价值计量且其变动计人当期损益的金融资产。该股份于2014年12 月3 1 日的市场价格为1400 万元。甲公司管理层判断,戊上市公司股票的公允价值未发生持续严重下跌。  要求:根据上述资料,不考虑其他因素,分析回答下列 6 -10 小题。

关于金融资产的划分,下列说法中正确的是( )。

A.对乙公司投资应划分为交易性金融资产

B.对丙公司投资应划分为持有至到期投资

C.对丁公司的认股权证应划分为交易性金融资产

D.对戊公司投资应划分为长期股权投资