问题 选择题

下列反应所得的溶液中一定只含一种溶质的是(  )

A.向硫酸酸化的Fe2(SO43溶液中加入过量的Ba(OH)2溶液

B.向AlCl3溶液中加入过量的氨水

C.向NaOH溶液中通人CO2气体

D.将过量的Cu粉加入FeCl3溶液

答案

A.向硫酸酸化的Fe2(SO43溶液中,加入Ba(OH)2溶液时,硫酸先和氢氧化钡反应:H2SO4+Ba(OH)2=BaSO4↓+2H2O,再与Fe2(SO43反应,反应为:Fe2(SO43+3Ba(OH)2-=3BaSO4↓+2Fe(OH)3↓,反应所得的溶液中只含一种溶质是过量的Ba(OH)2.故A正确;

B.氨水是弱碱,不能溶解氢氧化铝,氯化铝溶液加入过量氨水的反应方程式为:AlCl3+3NH3•H2O═Al(OH)3↓+3NH4Cl,反应所得的溶液中溶质为过量的氨水和产物NH4Cl,故B错误;

C.NaOH和CO2气体反应,反应为:CO2+2NaOH=Na2CO3+H2O,再通入CO2气体CO2+Na2CO3+H2O=2NaHCO3,溶液中的溶质可能为Na2CO3、NaHCO3或Na2CO3或Na2CO3.故C错误;

D.氯化铁溶液跟铜反应,+3价的铁离子被还原成+2价的铁离子,铜单质被氧化成+2价的铜离子,2FeCl3+Cu=CuCl2+2FeCl2,溶液中的溶质为CuCl2和FeCl2.故D错误;

故选A.

听力题

请根据字面提示与句意,用必修3Unit1-5中所学新词、短语的适当形式将小题中的句子补充完整。

小题1:I made an a_______ to him because I broke his bicycle.

小题2:Dad gave us a lecture about our table m_______.

小题3:Ancient people had different ways to explain how the world came into e_______.

小题4:The journey took a_______ two weeks. Maybe longer, but I can’t be sure.

小题5:The carpet m_______ 6 by 6 metres, so it has an area of 36 square metres.

小题6:The new owners have tried to give the restaurant a more family-friendly _______(气氛).

小题7:I’m sorry to bother you, but I have several questions to _______(咨询) you.

小题8:Columbus discovered America but did not explore this _______(大陆).

小题9:I'd like to _______(确认) our appointment at 3:30 p.m. Friday in your office.

小题10:The author deals with the problem of _______(暴力) among teenagers in the first few chapters.

小题11:Sir, you’re not allowed to enter the building if you don’t get our manager’s _______(permit).

小题12:_______(forgive) does not change the past, but it does enlarge the future.

小题13:A distant journey tests the _______(strong) of a horse and a long task proves the character of a man

小题14:She was a quick learner and adapted to the new _______(surround) well.

小题15:I found most of the characters in the play totally _______(believe), because they were not real..

小题16:约翰无法解释他没来学校的原因。

John could not ______ ______ his absence from school.

小题17:牛顿好奇苹果为何向下落而非向上飞。

Newton ______ ______ ______ what made the apple fall "downwards" instead of "upward".

小题18:人们经常谈到怎样在工作与个人生活间保持平衡。

People often talk about how to ______ ______ ______ ______ work and personal life.

小题19:定居温哥华以前,她是伦敦经营自己的古董店。

Before she ______ ______ in Vancouver, she had run her own antiques shop in London.

小题20:您在本照相馆的每一张留影,都将给您带来温馨与甜蜜的回忆。

Every photo taken in this studio will ______ ______ ______ the warm and sweet past.

小题21:Undoubtedly, exercise like walking has benefited many patients.

=" Undoubtedly," many patients ______ ______ ______ exercise like walking.

小题22:--Have you got any idea ______ the party is to be held?

-- This Friday night. Do you know ______ Sandy knows it?

小题23:We should learn ______ before a problem can be solved, it must be obvious ______ the problem itself is.

小题24:______ the town is no longer ______ it used to be is very obvious.

小题25:What makes me puzzled is ______ told him the news ______ the sports meeting was put off.

选择题