化学公主的个人资料

热化学反应有一个事儿不懂啊~！ H2+Cl2===2HCl.断裂H-H键所需要的能量是436KJ/mol，断裂Cl-Cl键所需要的能量是243KJ/mol，形成H-Cl键所释放的能量是431KJ/mol。反应完成时，生成物释放的总能量（862 kJ／mol）比反应物吸收的总能量（679 kJ／mol）大，故为放热反应。这不是生成物的能量高于反应的能量了吗，不应该是吸热反应了吗！！！

干冰晶体，为啥距离相等的CO2分子是12个，怎么算的？？？？

金刚石晶体中为啥每个碳原子被12个六圆环共用？？怎么算的？？

金刚石晶体中每一个小六圆环含1/2个碳原子是怎么算出来的？？？急。

晶体具有各向异性是什么意思？举个例子、

用氢键解释零摄氏度水的密度比冰大。。

硫酸的杂货轨道类型怎么算的啊？？

谁能把配合物那地方给我讲讲、、

什么叫价电子？

问个问题 2p轨道上只有一个未成对电子的X原子和3p轨道上只有一个未成对电子的Y原子有相似的化学性质？？？这句话怎么对的？？

s能级轨道是球形，p能级轨道是纺锤形，是什么意思？

如何判断分子的空间立体结构？？

判断物质的空间构型，是不是得先写出电子式？？

S02电子式怎么画？

金属键和离子键没有饱和性和方向性是啥意思？？？

共价键的饱和性。的问题。。。自旋方向相反的两个电子之间可以形成化学键。比如氢气是由两个氢原子形成的，那么这两个氢原子中的电子也不是自旋方向相反啊。。。

元素周期表的分区怎么能记住呢？

求选修三的典型练习题~！！

选修三那玩意我都不会~！咋整啊可！！

要求掌握顺反异构不？

同分异构体咋讲这学生能明白呢~！

sp几杂化的那玩意是怎么算出来的？高手帮忙讲下~！

有机化合物中碳原子的成键特点谁能给我系统的讲一下。这地方学不懂。不给力啊~！

高锰酸是强酸还是弱酸？？如题~！

Ksp的题常温下，向含白色沉淀AgCl的浊液中加入NaCl固体，AgCl的溶解度（？）（增大，减小，不变），AgCl的Ksp将（？）（增大，减小，不变）为什么？？？

铵根离子的水解能力强还是一水合氨的电离能力强？

平衡题！ N2+3H2----2NH3 平衡时N2，H2，NH3的物质的量分别为1mol，2mol，2mol。在上述平衡中加入2molNH3，2molN2。此时平衡将向哪移动？？

电极方程式 CH3OH做负极的电极反应方程式，碱性溶液！

问个题~ 若氨水的物质的量浓度是盐酸物质的量浓度的2倍，且等体积混合后溶液中各离子浓度由大到小的顺序为？？要详解！

过氧化钠与氮化镁所含化学键类型不完全相同？？？如题！

鉴别氧气空气氮气为什么用燃着的木条而不用带火星的木条？？？

2010-04-15 《小13，14》 1 When do you think they will ____their performance in the local teater? A take in B give off C put on D set out 2 Finally Mary was adumitted by Beijing Univeesity ,for which she ____five times. A had tried B was trying C has tried D tried 翻译一下。 3 I have bought you the books you want . Oh, good,I ______afraid you had forgotten. A was B am C had been D have been 4 My mind wasn't on what he was saying ,so I'm afraid I_____half of it. A was missing B had missed C will miss D missed 5 Hurry up!Alice and Sue are waiting for you at the school gate. Oh!Ithought they ____without me. A went B are going C have gone D had gone 《全，14》 6 I decided to go to the library as soon as I_____. A finished what I was doing B finished what I did C would finish what I was doing D finish what I did 7 let hurry.The persient is coming. A Oh,I thought taht me ___. A alreadly miss him B had alraedly missed him C will miss him already D have already missed him 8 Obviously,he _____a had cold.He sneezes so often. A has a bad cold B has been B had D was

2010-04-08 1 I_____in the back of the classroom. A was sat B siting C was seated D seated 2 It's impossible to _____a coversation with all this noise in the background. A carry on B go on C put on D move on 3 Oh ,dear.I forgot the air tickets. You ____something. A have left B are always leaving C are leaving D always left 4 ______Mr.Brown _____this week ? No. He is on holiday. A Has;worked B Does ;work C Did ;work D Is working 5 Why ?Tom, your shirt is so dirty! Mum,I ______my storeroom downstairs. A cleaned B have cleaned C has cleaning D have been cleaning 6 I've won a holiday for two days to Florida .I____my mum. A am taking B have taken C take D will have taken 7 Because the shop _____,all the T-shirts are sold at half price. A has closed down B closed down C is closing down D had closed down 8 What _____beautiful weather!Great for ____holiday. A a a B the the C the a D / a 9 You'd bette button up your coat;it ____cold and the wind is blowing. A gets B is getting C will get D has got 10 _______bright girls they are . A what B what a C what a D how a 11 ______sunny day!Let's go out for a walk . A How a B How C What a D What 12 ____great day July 1,1997 will be! A How a B what a C How Dwhat 我知道这几个是感叹句 13 We invited Ross and his parents to dinner,but____of them came. A all B no one C both D none 讲一下no one和none我区别。

2010-03-30 1 It's spring now.The students _____trees these weeks. A plant B are planting C will plant D planted 2 Jim asked Lin Feng ____forget to change water. A to not B don't C not D not to 3 At last it made them ____. A happily B quickly C friendly D slowly 4 I like exciting trips ,I'd love to trek ____the Amazon jungle next summer,because it's a good place to explore. A across B throuth C crossing D cross

10-04-27 1 He drove ____ the crossorads without seeing the red light. A pass B by C on D through 2 As she waited for the medical report from the doctor,her nervousness____.A has grown B is growing C grew D had grown 3 The doctor ____a ___ boy yesterday. A had saved/dying B saved/dead C has saved /dead D saved/dying 4 The old woman ___ for nearly two and a half hours. A have left B has left C have been away D has been away 5 Why didn't you go to the party last night. Because I ____ A wasn't invited B didn't invite C haven't invited D hand't invited 6 _____then I have been interested in clowns. A Since B From C By D After 7 I ____in this small mountain village when I was a child. A ues to live B used to living C used to live D used to life 8 They ___where to build the new hospital before the work began A have been decide B had decided C had been decide D will be decided 9 Great changes have ___in the poor rural area. A been taken place B taken palce C took place D had took place 10 People ____the annual competition for fun A enters B enter in C went into D enter for

请高人指点我想考研，可是从小英语就不好，打算从新概念一册学起，请问高手们把三册学完大概需要多长时间？我这样学效率如何，有没有更好的提高英语的办法？？

2010-03-20 1 Rose ____at school yesterday morning. A wasn't B isn't C didn't D doesn't 今天只错一个，这个题yesterday morning.不是过去时吗？为什么不选C而选A

有没有考教育学的师哥师姐们，帮忙给一下参考书目呗。。急，在

高手帮忙讲几道题，需要详解。 1 Linda often helps mother ¬¬¬_____the housework on weekends. A with B to C of D for 2_____my parents’ help, I bengin to catch up ____my classmates. A With/to B Under/with C With/with D To/to 3 The man is ___his caot. A taking to B taking down C taking off D taking on 4 You’d better ____her number in the phone book. A look into B look for C look up D look at 5 The Olympic Games is held in Beijing ___August. A on B to C between D in 6 The dog is ____its son in the park. A look to B look up C looking for D looking over 7 The doctor is _____the crying baby, but he can’t find out what is wrong with it. A looking over B looking after C looking for D Looking out 8 Don’t forget to ____your school things when you have finished your homework. A put off B put up C put down D put away

帮忙讲几道题，需要详解。 1 Tom Hanks is a very ___actor. A pretty B cute C handsome D smart 2 You konw there are 234 ___in our school. A man teachers B men teacher C men teachers D man-teachers 3 Where are ____? A the officer's room B the room officers C the officers' rooms D the office 4 Alice is fond of playing ___violin,while her bother is interested in listening to ___music. A /,the B the,the C the, / D /,/ 5 The twins look ___same 6 A computer ___think for itself. A mustn't B needn't C can't D isn't 7 Lily, you can't do that._____talk to him like this. A Needn't B Mustn't C Don't D Do 8 The students always ____music before they go to bed. A listen B hear C listen to D are listening 9 What about ___to the cinema on Sunday? A go B going C to go D went 10 Shall we do it at half past seven? A doing B to do C does Ddo

问题，要详解。 3 There____a football match in our school this afternoon. A are going to have B is going to have C are going to be D is going to be 4 They have ___on the hill. A apple tree B apple trees C apples tree D apples trees 5 The shop ____in the morning. A open B to open C opening D opens 6 You classroom is so dirty.Everyone should keep it____. A dry B open C clean D quiet 7 What a cold day!Sam,you'd better ______more clothes. A put on B to put on C take off D to take off 8 Dad,must I finish my homework today? NO,you needn't.You ____do it tomorrow. A need B must C can D will 9 This is your watch.____please. A Put away B Put on it C Put it in D Put in on 10 Henry ____be a home because he phone me form the farm just now. A mustn't B isn't C may not D can't

请高手留一下QQ号好吗？有问题要问，急~~

高手帮忙讲几道题，需要详解。 1.Look，here is a photo （）my family。 A to B with C of 2 Mr.Hyde's possible full name is ___. A Emma Hyde B Hyde K. john C petter A. Hyde D.Hyde William john 3 One is Jack,and ___is peter. A other B the other C two D that one 4 We don't have any ___on saturday. A students B teachers C classes D schools 5 ---Where is your brother? ---At ____. A Mr. Green's B the Mr.Green's C Greens D Green's 6 ___turn is it now AWho's B Whose C Who D Whom 7 He often says his class is too big and it is hard work for him to talk with every student ___English. A with B in C at D for 8 He enjoys ___black tea and green tea. A to drink B drinks C drink D drinking 9 Mr.White,with his friends,___on a trip. A have B has C is D are

问题，高手进。 They will build ___800-meter-long bridge. A a B an C \ D one 要详解。谢谢

问题，高手进。 what can you see on the wall？ A picture B photo C window 要详解

考试题！帮忙！两种固体反应生成三种物质，其中生成的一种物质是氯化钙问这两种固体分别是什么？

物理很差，请大家帮忙！谢谢，相当感谢

帮忙做一道题！谢谢 10摄氏度时，A，B两物质的溶解度分别是a克,b克，现要用结晶法从A，B的混合物中分离A（不考虑A，B共存时对各自的影响），现取m克混合物溶于100克热水中，然后冷却到10摄氏度，若要使A析出，B不析出，写出下列两种情况下，混合物中A的质量分数A%应满足的关系（m,a,b表示）当m小于a+b，A%（），当m大于a+b，A%（）

帮忙讲一道题！谢谢若ACL与BCL（A，B均表示+1价金属离子）的进体结构与NACL相同，且A离子的半径大于钠离子的半径，B原子的半径小于钠离子，则离子晶体的稳定性ACL（）BCL（填“大于”，“小于”，“等于”）

古文翻译！有趣！！！说之虽不以道，说也；及其使人也，求备焉。这句话是什么意思呀？请高人赐教！

帮忙写几个名句！ 1，寄蜉蝣于天下（）。哀吾生之须臾（）。（苏轼《赤壁赋》）2，（），（），谗人间之，可谓穷矣！（司马迁《屈原列传》）

有能力的给出详解！没能力的给出看法！既不同族，也不同周期的两种元素能比较金属性或非金属性强弱吗