11月12日SUB考试chemistry(化学)讨论专帖

so猫UID: 148633

11月12日SUB考试chemistry(化学)讨论专帖

大家有什么疑问可以在这里讨论
不要再新开帖子咯~~~
谢谢
:)

so猫UID: 148633

题目回忆也请放在这里哦
方便我们日后整理哦
谢谢大家啦~

P.S.: 代替giter斑斑发帖 他出去玩去啦 嘿嘿~

GITERUID: 138732

谢谢so猫mm帮忙开帖子~~呵呵~~尽管我去颓废了, 不过看样子你也去颓废了~~我马上先写点感想

GITERUID: 138732

贴过来一份~~Chem考试一些题目回忆

下面是runningpiggy总结的, 我在后面进行了补充
1、单物质三相图, 问三相点的意义
2、取代diene和dienophilic的DA反应
3、胺跟亚硝酸钠反应
4、路易斯酸强度判断, 大概最强的是PCl5
5、哪个物质既是Brodster酸又是Brodster碱
6、一级反应中T跟K的关系
7、有机酸强度判断，主要是间硝基苯甲酸跟对硝基苯甲酸的强弱¬¬——meta强
8、薛定谔方程在哪个选项中不能得到准确的解——He
9、哪族元素在常温下包含了三态
10、克拉伯龙方程
11、氢化铝锂跟羰基的反应
12、D原子含有什么微粒
13、几种分子和离子的偶极距判断
14、SN2反应中的立体化学
15、E2反应的反应中间体
16、三级醇的制法，要用到格氏试剂的那种
17、一级醇的制法，也是用格氏试剂
18、分子振动用什么谱来测
19、两道杂化态和构型的判断

March的补充内容:
1、有个enzymometallic的元素, 大概是Mo
2、天然中不稳定的氧化物, 大概是Hf
3、toluene的氯代反应进程和能量关系
4、升高配位滴定PH对滴定结果的影响
5、Diastereomer的判断, 有两个题
6、Br2加成的机理
7、烷基CuLi对不饱和羰基的beta位烷基化
8、苯胺还原生成diazo salt的机理
9、关于Van der Vaals半径的概念
10、苯基乙醇的合成, 问哪个产率高? 也就是制备一级醇
11、判断carbonyl在什么官能团里有? Amine, amide
12、环内酰胺的水解, beta lactam ring
13、判断还有de-couple peak的13C NMR的样品峰的化合物
14、手性中心产生的isomers
15、判断稳定的共振结构, Cl+的话C=Cl可以
16、根据球棍结构判断C的手性
17、判断金属配合物的金属化合价是+2的
18、nuclear reaction
19、电极反应的配平
20、Ksp的概念
21、乳糖的糖苷键结合方式和水解的方式
22、自由基反应中的chain initiation/propagation/termination
23、类氢原子能级跃迁等能级差的方式
24、[CoF6]2-高自旋单电子的个数
25、判断聚合物的单体
26、对二甲苯和quinone的色谱分离
27、二级反应速率常数的单位
28、比较金属卤化物的晶格能关系
29、有机氰化物的水解机理, 主要是第一步
30、用稳态近似处理的单分子反应机理Lindeman-Christianen, M的分压对反应级数的影响
31、催化加氢反应催化剂的作用
32、Phosphorescence的发光机制
33、Quantum Yield
34、Beer定律
35、NaCl的晶体构型, 晶胞包含的分子个数
36、判断GaAs的类型, semiconductor
37、根据 HPO4 2-, HSO4-等酸性排列顺序, 判断H2PO4-
38、硼烷的结构和对称性
39、酸、酯、酰氯生成酰胺的反应, 选择不合适substrate
40、配合物Pt(CH3)4 2+个几何构型
41、光电效应
42、用Quantum theory解释的现象, 大概有个估计凝固点的什么个变化不可以解释.
43、Ca离子浓度和ppm, 感觉ppm说的就是浓度~~和Ca的原子量没什么关系.

tomatopotatoUID: 129913

说答案

anluoluoUID: 2116225

北美的考试，感觉题大致相似，有些许区别
分析的正态分布
物化有靠waht is above the critical point
量化的 黑洞：非连续光谱；频率随温度变化。还有求本真直但直里有一个量化参数
生化：糖干键。单糖与甲醇在盐酸作用下成a,B 甘
有靠了Vb12含Co的
无机考地壳里含啥：猜的，初中就背了O Si Al Fe S...... 题里有一个 aluminum silicate

anluoluoUID: 2116225

还有一个难的：高分辨红外测什么 vibration, rotation or both?

so猫UID: 148633

楼上的吓死我了
我说怎么你说的题目我没考过~
不过你的题目不难哦

恭喜你 地壳的题目猜对啦
嘿嘿~~~
多的我就不敢看了
打击啊~~~~~~

JerryVonUID: 2127335

40、配合物Pt(CH3)4 2+个几何构型-->Pt(NH3)4 2+, Pt(CH3)4 2+;planar square
43、Ca离子浓度和ppm, 感觉ppm说的就是浓度~~和Ca的原子量没什么关系. ppm=microgram per mL, directly related with molar mass or atomic mass;

、有机酸强度判断，主要是间硝基苯甲酸跟对硝基苯甲酸的强弱¬¬——meta强: from resonance structure, finding the p-nitrobenzoic acid retains the relatively smaller value of pKa than the m-substituted corresponding compound. Substantiating evidence from Lange's Handbook of Chemistry, 15th edition, P8.62

2、天然中不稳定的氧化物, 大概是Hf: the question is: which of the oxides of the following elements could not be found in natural occurance? I prefer the choice Au.

35、NaCl的晶体构型, 晶胞包含的分子个数: the coordination geometry of both the cation and anion in a crytal which has the same pattern as NaCl is octahedral rather than tetrahedral. There is indeed four forms of NaCl in a crystal cell. This turned out to be a classical structural problem in variety of P.Chem Books.

compensating some additional problems:
Ni(NH3)6 2+ and Ni(en)3 2+ --> chelate effect;
common ion effect of CaSO4 in NaCl solution;
amperougravimetry( if without spelling flaws).

[ Last edited by JerryVon on 2005-11-15 at 21:28 ]

DigitalPigUID: 149730

sigh... 为什么我觉得对硝基苯甲酸比间硝基苯甲酸酸性强啊... :(
Pt(CH3)4构型似乎也写错了...
common ion effect of CaSO4 in NaCl solution; 这个一样的...


chelate effect 这个是什么啊. @.@

GITERUID: 138732

43题的理由我写在这个帖子里面了, 文献的处处也在里面, 附件你可以看一下:
https://bbs.gter.net/viewthre ... &extra=page%3D1

40、I simply know that ppm=parts per million, so I regarded it as 10-6g/L, I don't think I make the right answer, if you have reasonable definitions.

42、you're right in this problem, Au2O can occur in the lab when heated over 470k, while HfO2 is mainly one component in one of the natural occuring ore.

35、No problem in your crystal geometry explanation! because every one of the eight sodium atoms in the vertex angle of cubic are shared by eight crystal-cells, plus every one of the six sodium atoms in the face-center are shared by two crystal-cells :(1/8)*8+(1/2)*6=4(Na)
every one of the twelve chloride atoms in the middle of the edges of the cubic are shared by four crystal-cells, plus one entire atom in the central part of one crystal-cell: (1/4)*12+1=4(Cl)

Originally posted by JerryVon at 2005-11-15 11:10
40、配合物Pt(CH3)4 2+个几何构型-->Pt(NH3)4 2+, Pt(CH3)4 2+;planar square
43、Ca离子浓度和ppm, 感觉ppm说的就是浓度~~和Ca的原子量没什么关系. ppm=microgram per mL, directly related with molar mass ...

[ Last edited by GITER on 2005-11-15 at 18:42 ]

JerryVonUID: 2127335

43? the ppm pattern of concentration of Ca(II) cation? I'm afraid that your definition as 10-6g/L turned out to be that of part per billion. As is acknowledged, ppm, ppb and ppt actually have no units. However, liter is a unit on the scale of kg, in analytical chemistry. 10-3g/L, 10-6g/mL are the equivalents for ppm.

As for the strength of nitro-substituted benzoic acid, I'd prefer to let it aside, considering the little helpfulness of further discussion with merely enumerating different figures from different sources.

btw, your copy of pKa value table is interesting. A French book?

GITERUID: 138732

sorry, not 43, but No.7
My pKa value table comes from the courseware from Harvard's Advanced Organic Chemistry course. If you use Google with the keywords of both "pka"+"Harvard", you could easily find so.

JerryVonUID: 2127335

Originally posted by GITER at 2005-11-16 19:05
sorry, not 43, but No.7
My pKa value table comes from the courseware from Harvard's Advanced Organic Chemistry course. If you use Google with the keywords of both "pka"+"Harvard&quo ...

thanks, got it:)