专业英语练习答案2

专业英语练习答案2
专业英语练习答案2

Unit 1

IV

1. Chemical processes

2. Natural science

3. distillation

4. It is the atom that constitutes iron, water, oxygen etc.

5. Chemistry has a very long history, man's chemical activities can be

traced back to written times ago.

6. People learned that liquid could turn into gas (vapor) on certain condition in terms of distillation phenomena of water

7. You must understand a variety of properties of this material before using it.

V.

人们也许认为生命是三步进化的最终结果,第一步非常快,其余两步相当慢。这三步是:(I)物理进化(化学元素的产生),(II)化学进化(分子和生物分子的形成);和(III)生物进化(有机物的形成和发展)。

全世界在实验室进行研究的化学家一直在努力回答这些问题,但学习普通化学的大部分学生不是化学专业。他们的兴趣在工程、生物学、物理学、卫生专业、地质学或农业。为什么许多不同兴趣的学生必须学习有关化学的内容呢?部分是因为能激发研究化学家兴趣的问题也可以激发许多其它人的兴趣,从生物学家、地质学家、工程师到政治家和有关的居民,更普遍的情况是自然存在的许多事物都存在重要的化学方面。从天气状况(模式)到大脑功能到电脑的操作,化学原理在任何事情中都起作用。Unit 6

V.

1. Metals combine very easy with other substances including oxygen in air, except for noble metals such as gold and platinum etc.

2. All metals, except for mercury, are solid at room temperature, and their atom arranged very regularly, often nearing tightly each other in order to occupy the smallest space.

3. Hydrogen is also an active element, therefore monomer hydrogen occurs seldom on the earth.

4. It is until 1854 or so that started to produce aluminium on commercial scale.

5.These two elements neither combine at normal temperature nor react evidently at high temperature.

6. The both are no-colour gases,which can be liquified like all gases.

7.It is very difficult that separate these two compounds even though possibility.

Unit7

1.Chemical formula

2.Structural formula

3.Chemical equation

4.Reversible reaction

5.Exothermal reaction.

6.Replacement reaction (double decomposition reaction)

7.displacement reaction (replacement reaction or metathetical reaction)

8.Sometimes equal is substituted for arrow,then it is supposed that the

direction of reaction is from left to right.

9.It is fully reasonable that these chemical reaction undergo in above

mentioned way

10.Each atom of element participated reaction changed form of

combination each other.

Unit 8

1. Matter can be neither created nor eliminated.

2. Scientist had to know how to apply number to obtain exact explanation for problem

3. Any matter,solid,liquid or gas, is all composed of atom.

4. We hope that scientists will be able to find (discover) more secrets about the universe.

5. The experiment is successful. Its result is the same as what we expected.

6. We will soon accomplish the test

7. People had learned to fire after many centuries

8. Teacher thinks that is very important to make student remember that two substances mixed simply may cause chemical change

9. More exploration of scientist for the secret of material interior make man more clearly find that the inner structure of the universe is reasonably and precisely arranged

10. Sound conducted by soft material similar to cloth is worse than by

hard matter such as wood, iron and the others.

V英译汉

氯的电负性比氢大,在一个氯化氢分子中,氯原子对共用电子对的吸引力比氢更大,因为原子与共用电子对结合得更紧密,所以在分子中氯的一端比氢一端具有更大的负值。如果你把一个轨道当作外观模糊的(电子)云,那么氯原子附近的云的密度就更大。在共价键中电子不均匀共用时,此键可以说是极性的。因此在氯化氢中的成键是极性共价键。而在氢分子或氯分子中是以非极性共价成键。极性共价键不是一个离子键。在一个离子键中,一个原子完全失去一个电子,在一个极性共价键中,在键的正的一端的原子(HCl中的H)在成键电子对中仍有一些共用。为了区别在极性共价键和离子键中的电子排布,可以采用以下符号Hδ+-C lδ+

原子之间的线段代表共价键即一对共用电子。δ+表示这一端是部分正的。δ-表示

这一端是部分负的(“部分”这个词是用于把这个电荷与在离子中的全电荷(单位电荷)

区分开来)。

Unit 9

1. Biological catalyst called enzyme can serve as medium to cause

chemical reaction that occusr almost in biological system.

2. Catalyst is a substance that can alter the rate of a reaction but wouldn't

change itself forever.

3. For example, we freeze the food to slow down chemical reaction

decaying the food.

4. The rate of chemical reaction, namely measure of reaction progress,

was influenced by the factor that can alter the efficient number of collision.

5. The chemical bond of reactant molecule must be broken down before

beginning to form products.

6. In endothermic reaction, reactant taked up energy which turns into

latent energy stored in chemical bond of unstable compound.

7. In exothermic reaction, reactant released latent energy to form more

stable compound.

8. The reaction generated a great deal of energy in the form of light, heat.

9. Sometimes the energy is written in chemical equation as a product.

10. the activities of sodion and chloride arranged in crystal was less than

that of atom of sodium and chlorine.

11. Mixing the metal of sodium with chlorine gas will generate violent

reaction.

V.

有关一个给定的化学反应化学工程师必须问(考虑)的基本问题有两个:(a)如果容许反应进行到平衡,它能进行到多远?(确实,反应可以完全有利的方向进行吗?)(b)反应进行得多快?

问题(b)是一个化学动力学的问题,终归须知道速率方程和有关反应机理的每一步的速率常数(习惯上表示为K)。

注意一个特定反应的速率方程不一定通过观察反应计量系数获得,除非反应机理是一步过程,而且这是通常须由实验来确定的,化学反应时间幅度范围从几分之纳秒一直到数百万年,因此,即使对问题(a)的回答是反应有望进行基本完全,反应也许如此之慢以致在工程术语上是完全不切实际的。

Unit 10

1)n-butane, n-pentane, n-hexane, n-octane

2)2-methyl-pentane

3)2,2-dimethyl-4-ethyl-hexane

4)2-methyl-5-isopropyl-octane

5)4-propyl-4-isopropyl-heptane

6)(2-methyl)propyl-cyclobutane

7)2-ethyl-3-methyl-1-butene

8)2-chloro-3-hexene

9)5-methyl-4-ethyl-2-hexyne

10)vinyl-ethyne

11)2-hydroxyl-4-methyl-pentane

12)2-hydroxyl-3-hexene

13)tert-butanol或2-hydroxyl-2-methyl-propane

14)tert-butyl-ethyl-ether或2-ethoxyl-tert-butane

15)ethyl-isobutyl-ether or 1-ethoxyl-2-methyl-propane

16)ethylene glycol or 1,2-ethanediol

17)propyleneglycol or 1,2-propanediol

18)1,2,3-propanetriol or glycerine

19)amino ethane or ethylamine

20)N-methyl-1-amino-2-methyl-pentane

Ⅴ write equation

1. propene +chlorine 1,2-dichloropropane

2. propyne+chlorine 1,2-dichloropropene

3. propene+HCl 2-chloropropane

4. propyne+HCl 2-chloropropene

VI Translation

饱和碳氢化合物在碳原子之间有单键,不饱和碳氢化合物的碳原子之间有多重键,在多不饱和碳氢化合物分子之中存在多个多重键不饱和碳氢化合物可以分类如下:碳原子之间含有一个或多个双键的是烯烃(含有两个双键的化合物叫二烯,含有叁个双键的化合物叫三烯);

碳原子之间包含有一个或多个叁键的是炔烃;

有多个双键的苯环的是芳香族(化合物)。

Unit 11

IV

1. Similarly, solvent also may not be liquid matter but the other

2. The curve plot drawn (made / produced) by solubility as one coordinate and temperature as another coordinate is called solubility curve.

3. The concept also explained another situation concerned.(or The concept also provided explaination for another situation concerned)

4. Air is mixture of gas ,of which the most is nitrogen in the form of N2

5. Scientist gradually believed that oxygen in air was needed for combustion several centuries ago

6. The direction of reaction and the position of equilibrium are also influenced by temperature, pressure and other condition

7. Hydrogen has very strong affinity for oxygen and combine readily with oxygen to form water

8. Symbol made up of two letters must be used too because the number of element is more than that of letter

9. In inorganic chemistry, chemical formula is used to represent atomic arrangement in molecule

10. In a compound, the proportion of the number of atom of an element

to that of another is constant

V

玻意尔(Bohr)模型提出不久后,就发现在一个原子中的电子比Bohr提出的要复杂

得多,实验证实电子既有粒子的性质(质量)也有光的特性(波的特性)。因为它的两重性,电子不能被看作是在确定范围内绕核旋转的一种简单粒子,而且如Bohr 所说的如果电子高速运动,我们就不能更确切地知道它的位置。快速运动的电子的运动可以比做被职业棒球投手投出的一个快球,球投得越快,击球手越难以知道它的位置,由此它的位置的不确定性产生了对氢原子中电子的一个复杂的数学方法,此方法称为波动力学。采用波动力学模型方程,仅仅能确定在某一瞬间一个给定的空间区域电子出现的概率。Bohr计算了氢原子中电子在基态能级运动的准确半径,在波动力学模型中,这个半径意味着仅表示电子出现的最高概率。我们不再把电子看作是在核周围围绕某一确定的路径旋转。实际上,在这个模型中原子的电子的运动

是不完全被理解的。

Unit 12

IV

1. That the absorption peak of a certain particular type compound is intensive and broad is evident particularly in infrared spectra.

2. In infrared spectra, the intensive and broad absorption peak between 3500cm-1and 3200 cm-1may be generated by stretching vibration of hydrogen bond in alcohol or phenol.

3. If knowing frequency, we can calculate wavelength.

4. All of metals are good conductor because of a large number of free electron in it.

5. The rate of chemical reaction is directly proportional to the concentration of reactant.

6. If not knowing the structure of the atom, we can not study the structural chemistry.

7. By the law of energy conservation, the input energy must equal the output energy.

8. Except for hydrogen atom,all of atoms contain one or more neutrons in its nucleus.

9. One of the most important properties is interaction each other.

10. The experiment of energy conversion indicated that the energy can be neither created nor exterminated.

V.

在一个确定的元素的原子核中的中子数的可能变化。例如,大部分氢原子有一个含一个质子的核,而其核不含有中子(因此质量为1amu)。然而,在50000个氢原子中的大约一个其核确实有一个中子以及一个质子,这种较重的氢叫做氘(重氢),质量为2amu。两种都是氢原子(原子序数为1(那就是说具有一个质子)都是一个氢原子)。具有这种关系——质子数相同而中子数不同的原子叫做同位素。一个第三的、非常稀少的氢的同位素是氚(超重氢),在它的核中有两个中子和一个质子(因而质量为3amu)。大部分而不是全部元素在自然界中以同位素形式存在。这个事实也要求对Dalton的原创理论进行大的修改。Dalton认为相同元素的所有原子的质量相同。我们现在说大多数元素有几种同位素。那就是说,中子数不同的原子,其质量是不同的。

Unit13

V.苯(环)型的跃迁在CD光谱学中可以更好地被分辨。因此Salvadori及其合作者报道了一个手性芳香烃(s)-(+)-2-苯基-3,3-二甲基丁烷的UV和CD光谱,他们能在185nm之上的区域测出三种这种烃的Cotton效应。这些cotton效应都是正的,分别对应的是芳环的'B、'La,'Lb跃迁。在260nm区域的1Lb谱带[θ]max+5000超过了比由一般开链苯基化合物(比较α-苯基乙醇)所显示的谱带更强的数量级,而且说明受阻构象可能变动。在象生物碱这样的刚性芳香系统发现了类似大的扁率值。通过在-100℃测量260nm Cotton效应获得证据,这个证据就是受由于大体积叔丁基产生的空间效应约束,手性2-苯基-3,3-二甲基丁烷只有一个构象。

Unit 14

化学家们也会创建理论来解释他们的实验结果,一个有用的理论也可以对可能观察到的新现象作出预测,而且对任何理论进行检验以判断预测是否和现实一致。化学家们通过设计和进行新实验连续地检验和改进化学理论。

有时实验会给出出人意料的结果,一个结果可能出现而理论主张是不可能的,实验观察与理论预测相抵触时,人们可能会激动,但是这种情况发生时化学家们谨慎地继续进行实验,他们反复试验以确定原来的观察是可重现的,如果预测与实验的不一致得到证实,这个理论必须进行修改。当理论和实验不一致时,理论必定是错误的。随化学领域的不定扩大可以给你一个刺激感,这里的三个最新进展影响了化学家如何看待他们的学科。

Unit 15

V.

1. Mass spectra can be used for gainning informations of all organic compounds, including molecular weight, molecular formula, molecular structure, abundance of isotope and concentration of ingredient in mixture.

2. We have already discussed the chemistry of iron concerned steel, but many compounds of iron have useful properties.

3. The mixed sample can be usually introduced into mass spectrometer by gas chromatograph or liquid chromatograph.

4. Radioisotope is playing a more and more important role in the application of peace of atomic energy.

5. The discovery first proved that some atoms have the same chemical properties but their atomic weights are different.

6. The above-mentioned conclusions are similarly applicable to all of other situations as well.

7. Whenever writting (drawing) an organic structural formula, we must check it to assure that every carbon atom has four covalent bonds.

8. Under suitable condition, pure liquid can serve to form the large monocrystal rather than thousands of crystallites.

VI

一个分子式一般由一个准确的质量测量值得到,使用已知准确质量的内标时准确质量测量值常常可达到10-3Da以上的精密度。然而,即使具有这个精密度,在考虑在任何名义质量的所有可能的元素组成时唯一的匹配很少获得。可能匹配的数目随可能存在的元素的数目的增加而增加,随可能的每一元素的原子数目的增加而增加,而且还随分子量的增加而增加。对于有机化合物只有普通的杂原子(O,N,F,Cl,Br,I,S 和Si),而且分子量低于500Da的情况,只需考虑几种可能的匹配。因而,准确的质量测量常常给一个逐一的合理式,而很少给一个简单式,尤其是在考虑样品的其他信息时,一些补充信息可从质谱本身包括同位素丰度分布得到,同位素丰度分布在下一单元考察。

Unit 17

(1)(a)对于复杂混合物的结晶来说,必须找到最佳溶解度关系,以此能知道具体原料的最大产量和冷却水温度,这类问题常常通过费力的反复试验用图解法解决,但ENYEDY制作了一个从三元系统中连续真空结晶出双盐的计算图,也即是从FeSO4-(NH4)2SO4-H2O中结晶出FeSO4(NH4)2SO4·6H2O。此图作合适的修改可用于类似的条件。

(b)GEE.CUMMINGHAM和HEINDI对中试装置(2T/d)进行了详细说明,该装置是研究生产无铁明矾的工业可能性。据报道在最佳条件下系统损耗醇低于0.5%。所显示的详细成本估算在经济上是可行的。THOMPSON和BLEVHARCZYK 提出了使用乙醇进行天然卤水的工业结晶分离。

(2)共沸类质同晶过饱和砷酸盐核异丙基醇钠硫酸盐间甲酚糖膏十水结晶的同系物衍生物结晶四硼酸盐盐析乙基苯胺矿物油。

Uint18

(1)初步设计是一个极宽的主题,包括气-液平衡、回流段之间的关系、逐渐计算、多

组分蒸馏的独特性质、塔板效率和填充效率、放大、塔径确定、流体模式、塔板的类型、填充材料及其尺寸。这个主题占去了大多数蒸馏工艺大部分,也许代表了我们现在的大部分的蒸馏知识。

(2)闪蒸出流平衡曲线堰重蒸设备塔顶产物焓交点辅助装置精馏工

段回流再沸器汽提(提馏)塔底产物

Unit 22

3:(1)a 在另一项研究中,据报道染发的妇女和从没染过头发的妇女相比,染色体确实有更大程度的损害,由染发剂引起妇女的基因物质的损害可以支持这个实验研究,此研究认为染发剂可能有诱变性和致癌性。

b 我们可以区别通过擦亮作用赋予指甲表面光亮形成的光泽和使用指甲油产生的光泽。前者,由于在擦亮过程中产生摩擦,促使血液流向指甲床的大量毛细血管,由于增加了血液的供应,可以对指甲的生长产生一些温和的刺激作用。后者,取决于覆盖在指甲板上一薄层非常光亮的纤维素硝基漆,此法已经迅速流行而且基本上取代了磨光方式。尽管在连续的两层指甲油之间也可以按法国擦亮剂方式使用擦亮剂以增强光泽。

(2)对亚苯基二胺,降解,丙烯,头皮屑,洗剂,N-亚硝基二乙醇胺,致癌的,未成熟(or早熟),香波(or洗发剂),激素(荷尔蒙),防汗剂,诱变性,脱臭剂,推理(必然结果),甘油

4:surfactant, environmental pollution, emulsifier, side-effect, dirt, detergent, perspiration, preservative

Unit 24

(1) We define activity as size (measure) of catalysis of catalyst

(2) catalytic reaction may be carried out in different phases, of which mechamisms are generally consistent

(3) Enzymes are the most efficient proteins in the human body which accelerate the metabolism of the human body.

3.题目要求可能有误,以翻译练习处理

(1) 在小车中使用雷达以便提醒驾驶者在路上的障碍或可能的目标,这一点在本章前面进行讨论。

(2) 将油从发动机底部的容器(或浅箱)泵出,然后以流体送往发动机的所有轴承和其它运动界面。

(3) 必须把重点放在电子工业的发展上。

4:

reaction equilibrium , repetitiveness, elementary reaction step, stability,

catalytic cycle, activity, quantitative analysis, selectivity, metabolic reaction, chemical energy, reaction mechanism, polymer nylon(or nylon),qualitative analysis,molecular-sieve,tubular reactor, inhibitor, stoichiometry.

补充课后习题答案:

Unit 17

2)共沸类质同晶过饱和砷酸盐核异丙基醇钠硫酸盐间甲酚糖膏十水结晶的同系物衍生物结晶四硼酸盐盐析乙基苯胺矿物油。

Unit 24

4. reaction equilibrium , repetitiveness, elementary reaction step, stability, catalytic cycle, activity, quantitative analysis, selectivity, metabolic reaction, chemical energy, reaction mechanism, polymer nylon(or nylon),qualitative analysis,molecular-sieve,tubular reactor, inhibitor, stoichiometry.

课文中句子的翻译:

An inhibitor slows down a catalytic reaction ;a competitive inhibitor slows down the reaction by competing with the reactants in bonding to the catalyst.A very strong inhibitor,one that bonds so strongly that it virtually excludes the reactants from bonding with the catalyst ,is called a poison.

抑制剂减慢催化反应;具有竞争性的抑制剂是通过与反应物竞争相键合的催化剂来减缓反应,一种很强的抑制剂,与催化剂键合得如此之强,以至于完全地使反应物不能与催化剂键合,这种现象叫中毒。(意译)

抑制剂减慢催化反应;具有竞争性的抑制剂是通过与反应物竞争相键合的催化剂来减缓反应,一种很强的抑制剂,与催化剂键合得如此之强,以至于完全地使反应物不能与催化剂键合,这种抑制剂叫毒物(直译)

数学专业英语课后答案

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