专业外语PPT5
Mn+ + x:L -----→ M(:L)xn+ The forward reaction is coordination and the reverse reaction is dissociation. Both coordination and dissociation usually occur in stepwise fashion when x is greater than l, so that the general equation above may be the sum of several stepwise equations.
Here both the anionic oxygen and the nonionic nitrogen have unshared electron pairs and may coordinate with a given cation. An example is the complex [Co (H2NCH2CO2 )3]. in which the cobalt is coordinated with the nitrogen and one of the oxygens of each glycinate. A polydentate ligand, when coordinated at two or more points to a central ion, forms a ring structure such as illustrated by the ethylenediamine complex of cobalt above3. This type of complex is called a chelate, and the polydentate ligand is a chelating group.
Ligands that are divalent or contain two donor atoms, like ethylenediamine (H2N— CH2—CH2 — NH2) . are bidentate because they contain two points or sites that enter into bonds with the central ion.
At the other extreme, complexes like Fe(CN)64- involve primarily covalent bonding. This variation in behavior is further illustrated by compounds listed in Table 9. The first four compounds listed are saltlike substances in which either the cation or anion is complex. This is apparent from1 their composition in aqueous solution. However, these same ions exist in the solids, although their formulas may be written as double salts as in the table.
In each of these cases the complex ion survives through the. Solution process and there is little evidence of free ligand or hydrated monatomic cation in solution. Note that the ligands may be molecular, as NH3, or anionic, as CN-. NO2- , or F. In the case of VF4(H2O)2-, vanadium is coordinated with both anionic and molecular ligands. The fifth compound, Pt2Cl4•4NH3, contains both complex cation and complex anion in solution and in the solid. The last compound has a crystal structure indicating the presence of CuCl42- complex ions.
The nature of the coordinate bond varies from essentially covalent, including double bond character in some cases, to essentially ionic. In the case of complexes such as Na(H2O)x + in aqueous solution, the sodium ion interacts with the coordinated water molecules much as a sodium ion in crystalline sodium chloride interacts with neighboring chloride ions. The bonding forces can be treated as electrostatic interactions.
Unit Five THE COORDINATION COMPLEX
一.词汇(WORDS)
1.ligand: n. 配体 ligand field crystal field 2.forward: adj. forward reaction reverse reaction 3.electrostatic: adj. 静电的 4.saltlike: adj. 类似盐的 5. polar: adj.极性的 polarizable: adj.可 极化的 6.unidentate: adj. 单齿的 unidentate ligand: bidentate: adj
7.ethylenediamine: n. 乙二胺 8.glycinate: n. 甘氨酸盐 9.chelate: n. 螯合物 10.cyano- chloro- carbonato- amineaquo- carbonyl- bitroso- acetatonitrato- hydroxo- oxalate 11.much as: 与~类似，象～一样。 12.enter into ：参加，成为～的一部分。
However, when the substance is dissolved in water, a mixture of hydrated monatomic ions results. This simply indicates that Cu ( II ) forms a more stable complex with water ligands than with chloride ligands, and that a high degree of ionic character allows rapid conversion to hydrated Cu( Ⅱ ) upon solution. The absence of CuCl42- in solution does not prove that it is not present in the solid.
二.课文（TEXTis for the formation of a coordination complex is the coordinate bond. There must be an electron-pair acceptor and an electron-pair donor. Thus, coordination reactions are examples of Lewis acid-base neutralization. The central ion is the Lewis acid, or electron-pair acceptor, and the surrounding groups, called ligands, are Lewis bases or electron-pair donors. In general, this reaction may be described as
The extent of the attractive forces determines the stability of the complex, and is dependent on the charge and size of the central ion and ligands.
Using this theory, it is possible to calculate the energy effects for many of the charge and size factors and finally to obtain values for bond energies. The latter are useful in predicting properties and types of configurations for a large number of compounds.
Ligand Groups Ligands must be polar or polarizable (nonpolar molecules are poor coordinating groups), and they usually have unshared electron pairs that may form coordinate bonds with the central ion. Ligands may be classified (Table 10.) on the basis of their ability to form one bond with the metal ion (unidentate) or their ability to form two bonds (bidentate).
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英语专业学术类通用PPT模版
make sure he can make it clear
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NOTICE
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In this part you should describe your business to the investor. You have to make sure he can make it clear
In this part you should describe your business to the investor. You have to
make sure he can make it clear
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In this part you should describe your business to the investor. You have to
make it clear
ADD YOUR TEXT
In this part you should describe your business to the investor. You have to make sure he can
make it clear
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In this part you should describe your business to the investor. You have to make sure he can
In this part you should describe your business to the investor. You have to make sure he can
make it clear
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In this part you should describe your business to the investor. You have to make sure he can make it clear
In this part you should describe your business to the investor. You have to
make sure he can make it clear
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In this part you should describe your business to the investor. You have to
make it clear
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In this part you should describe your business to the investor. You have to make sure he can
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In this part you should describe your business to the investor. You have to make sure he can
In this part you should describe your business to the investor. You have to make sure he can
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专业英语ppt.ppt
❖ Quality control work is unique :
(1) Accuracy :the data must be accurate
(2) timeliness :Samples must be tested as soon
as possible without delay
(3) Continuity
supervision and testing centers, testing centers for quality control of chemical fertilizers, pesticides Supervision and Testing Center, veterinary testing centers, feed quality and safety of agricultural products
health
• related to production development, consumption
safety, economic development
• one of the basic functions of government
2.The Relationship between Safety and Test ﹡quality of agricultural products depends on the
❖ quality and safety testing, for the present, can not leave without a large number of inspection agencies
❖ inspection agencies includes:seed quality
(1) Accuracy :the data must be accurate
(2) timeliness :Samples must be tested as soon
as possible without delay
(3) Continuity
supervision and testing centers, testing centers for quality control of chemical fertilizers, pesticides Supervision and Testing Center, veterinary testing centers, feed quality and safety of agricultural products
health
• related to production development, consumption
safety, economic development
• one of the basic functions of government
2.The Relationship between Safety and Test ﹡quality of agricultural products depends on the
❖ quality and safety testing, for the present, can not leave without a large number of inspection agencies
❖ inspection agencies includes:seed quality
专业英语课程介绍 ppt
-
Internet
10
Part-time job:
attendant /waiter/tourist guide/worker/sales promotion/program design/
Hale Waihona Puke -11Travel:
go outing, scenic spots, group traveling,
budget traveling, sightseeing, international travel
• Good morning, everyone. My name is …,and my number is ….This time I will talk about my holiday. (Today my topic is about my holiday)
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25
• During my holiday, I did lots of things. First of all…Secondly…And last…
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8
Housework:
Cleaning, cooking, laundry, pets, indoor flowers caring
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9
• Surfing, • chat, • gaming, • Playing cards • e-mails, • collect information, • Listen to music
How did y.ou spend your winter vacation?
-
5
How was your vacation?
It was wonderful. It was great. It was exciting. We really had great fun. We enjoyed our selves.
Internet
10
Part-time job:
attendant /waiter/tourist guide/worker/sales promotion/program design/
Hale Waihona Puke -11Travel:
go outing, scenic spots, group traveling,
budget traveling, sightseeing, international travel
• Good morning, everyone. My name is …,and my number is ….This time I will talk about my holiday. (Today my topic is about my holiday)
-
25
• During my holiday, I did lots of things. First of all…Secondly…And last…
-
8
Housework:
Cleaning, cooking, laundry, pets, indoor flowers caring
-
9
• Surfing, • chat, • gaming, • Playing cards • e-mails, • collect information, • Listen to music
How did y.ou spend your winter vacation?
-
5
How was your vacation?
It was wonderful. It was great. It was exciting. We really had great fun. We enjoyed our selves.
专业英语PPT完整版资料
China • 麻省理工学院 The Massachusetts Institute of
Technology
8
• （4）图题中一般可以省去冠词。下面例子中带下划线的词的前 面就省略了冠词。
• 图2-1用旋转矢量的垂直分量来产生正弦波 • Figure 2-1 Generation of sine wave by vertical component of
current,voltage and resistance. • 晶体管是由发射极、基极和集电极三部分构成
的。 • A transisitor consists of three parts:emitter,base
and collector.
10
• （6）表示独一无二的人之前不用冠词。 • 这被称为1赫兹，以纪念无线电波的发现者海
network.
12
• 3.特殊情况 • （1）在表示某个参数的单位的词前往往用
定冠词。 • 电位差的单位为伏特。 • The unit of potential difference is the volt. • 电容的单位为法拉。 • The uint of capacitance is the farad.
• 该电阻上的电压为零点几伏。 • The voltage across the resistor is a few (或 several ) tenths
of a volt. • 这根导线的电阻为零点零几欧姆。 • The resistance of the wire is a few (或 several ) hundredths
called a Watt(W),in honor of James Watt,developer of the steam engine.
Technology
8
• （4）图题中一般可以省去冠词。下面例子中带下划线的词的前 面就省略了冠词。
• 图2-1用旋转矢量的垂直分量来产生正弦波 • Figure 2-1 Generation of sine wave by vertical component of
current,voltage and resistance. • 晶体管是由发射极、基极和集电极三部分构成
的。 • A transisitor consists of three parts:emitter,base
and collector.
10
• （6）表示独一无二的人之前不用冠词。 • 这被称为1赫兹，以纪念无线电波的发现者海
network.
12
• 3.特殊情况 • （1）在表示某个参数的单位的词前往往用
定冠词。 • 电位差的单位为伏特。 • The unit of potential difference is the volt. • 电容的单位为法拉。 • The uint of capacitance is the farad.
• 该电阻上的电压为零点几伏。 • The voltage across the resistor is a few (或 several ) tenths
of a volt. • 这根导线的电阻为零点零几欧姆。 • The resistance of the wire is a few (或 several ) hundredths
called a Watt(W),in honor of James Watt,developer of the steam engine.
英语专业综合英语第五册.ppt
Athletic activities help kids devn to work as part of a group, and gain confidence and a sense of fair play.
competitive sports activities help children develop their ability to work in collaboration with others, build up their confidence and develop confidence and develop an awareness of playing the game in a fair and honest way.
By playing games ... kids acquire the skills and form the views that will decide what kind of grown-ups they will be.
coordination n. the skillful and balanced movements of different parts, especially parts of the body, at the same time
equitable, esp. in sports e.g.: (1) As a referee, you must ensure that there is fair play in the game from beginning to end. (2) By the way, the opposite of fair play is foul play. (3) The football was given a red card because of serious foul play.
外研社新时代职业英语专业篇 电力英语PPT_U5
is monitored by advanced sensors and instrumentation technologies to
detect significant trends.
Practical Reading
Words & Phrases
Words asset n. 资产，财产 deterioration n. 恶化，退化 diagnose v. 诊断，判断 instrumentation n. 仪表 interval n. 间隔，间歇 maintenance n. 维护，养护 mitigate v. 减轻，缓和 off-peak adj. 非高峰时段的 predetermined adj. 预先决定的 premium n. 额外费用 shutdown n. （机器）停机
maintenance.
• Optimized total cost of ownership (TCO): Without maintenance,
customers and industries suffer emergency shutdown situations, which
can cause both spare parts and labor to be sold at a premium, in
Warming Up
Match the following tools (A-G) to their names.
__A___ electricity meter __C___ cutting plier __B___ test pencil ___E__ coil ___F__ safety helmet __G___ cable ___D__ universal meter
Unit5-Languageppt课件
10. suede: [sweɪd] leather with a soft brushed surface
11. rouge: [ruːʒ] blusher, make up, lipstick
12. deluxe: [də'lʌks] luxurious
13. delicatessen: [,delɪkə'tes(ə)n] a store that sells good quality cooked meat, cheese, and food from other countries.
reflect the social and cultural changes.
8
Question 2. What is the relationship between language and thinking?
Answer 2. Language reflects the way people think. Different thought patterns have different language code, just like Chinese and English.
6
Background
Classification of world languages 1. Indo-European Family 印欧语系 2. Sino-Tibetan Family 汉藏语系 3. Non-Pacific languages Family 非太语系 4. Artificial International Languages 人造国
6. Hysterical: n. hysteria; behaving in an uncontrolled way because one is extremely excited, afraid, or upset
英语学习专业英语讲义PPT课件
Being a precise quantitative theory, it does not use phrases such as those just given, but calculates for any question under study the numerical probability that it is true.
2、从句在说明主句时有三种可能位置-前、后、中
第13页/共17页
中间-嵌入句将主句分成两部分，造成阅读理解的困难。
This is not, of course, the case in human affairs, and the most that can be done is to seek for mathematical models which describe, however imperfectly as yet they are, the presumed behavior of the system or situation under investigation.
D: 缩略词 Laboratory: lab unidentified flying object: UFO Radio detection and ranging: radar Transistor 和receiver合成transceiver：收发机 Telecommunications satelite: TELESAT通信卫星 练习1：写出下列缩略词的中英文全称：PID、PLC、PLD、MOS、TTL、TS、
总结：
语法分析时：
1、找谓语，再找主语。汉语常略主语，而英语中是由主、谓
第14页/共17页
科技英语翻译技巧（translating skills of scientific and technical English)
2、从句在说明主句时有三种可能位置-前、后、中
第13页/共17页
中间-嵌入句将主句分成两部分，造成阅读理解的困难。
This is not, of course, the case in human affairs, and the most that can be done is to seek for mathematical models which describe, however imperfectly as yet they are, the presumed behavior of the system or situation under investigation.
D: 缩略词 Laboratory: lab unidentified flying object: UFO Radio detection and ranging: radar Transistor 和receiver合成transceiver：收发机 Telecommunications satelite: TELESAT通信卫星 练习1：写出下列缩略词的中英文全称：PID、PLC、PLD、MOS、TTL、TS、
总结：
语法分析时：
1、找谓语，再找主语。汉语常略主语，而英语中是由主、谓
第14页/共17页
科技英语翻译技巧（translating skills of scientific and technical English)
实用英语U5TextA110页PPT
While-Reading Task
8 Freed went to his office and called the butcher. “I just saw your son washing the steps at the firm across the street from mine. He seems like an intelligent young man.
Unit 5: Text A
Pre-Reading Task While-Reading Task After-Reading Task
Pre-Reading Task
♣ Text-Related
Information
♣ Pre-Reading
Activity
Text-related Information
While-Reading Task
2 Countless times I’ve seen that if you cast your bread upon the waters, it will come back hundred-fold. But there is one story in particular that, for me, illustrates the point. To this day it can still move me to tears. 3 On a crisp spring day in 1942, Max Freed, the owner of Hercules Manufacturing, a shirt-making company in Winnipeg, Canada, was returning to his factory with a bundle of orders tucked neatly beneath his arm. Business was good and Max, although only 30, was carving out a niche as a successful businessman.
《专业英语基础知识》ppt课件
Specialized English for Material Science and Engineering
1
课程简介
一、什么是专业英语？ 二、为什么学习专业英语？
2
一、什么是专业英语？
普通英语（Common English, Ordinary English）
科技英语（English for Science and Technology）
➢The transistor, which is working with correctly polarities, can work as an amplifier. The transistor working with correctly polarities can work as an. amplifier. 工作于正确电源极性下的晶体管，作用就像放大器。
5. 复杂长句使用频繁（长句多）
6. 省略句使用频繁（省略句多）
7. It句型使用频繁（先行it结构多）
12
1.广泛使用被动语态 (客观性)
非人称语气
主体是客观现象及事物本身，而非动作的发出者，把论证 说明的对象置于句子主语的位置，既能突出中心，又能吸引读 者的注意。
➢固体材料可分为三种基本类型：金属、陶瓷和聚合物。
➢To contol the transformation behavior of austenite, the process of alloying and heat treatment can be used. 为了控制奥氏体的转变特性,可以采用合金化和热处理工艺。
➢The function of a fuse is to protect a circuit. 保险的作用就是保护电路。
1
课程简介
一、什么是专业英语？ 二、为什么学习专业英语？
2
一、什么是专业英语？
普通英语（Common English, Ordinary English）
科技英语（English for Science and Technology）
➢The transistor, which is working with correctly polarities, can work as an amplifier. The transistor working with correctly polarities can work as an. amplifier. 工作于正确电源极性下的晶体管，作用就像放大器。
5. 复杂长句使用频繁（长句多）
6. 省略句使用频繁（省略句多）
7. It句型使用频繁（先行it结构多）
12
1.广泛使用被动语态 (客观性)
非人称语气
主体是客观现象及事物本身，而非动作的发出者，把论证 说明的对象置于句子主语的位置，既能突出中心，又能吸引读 者的注意。
➢固体材料可分为三种基本类型：金属、陶瓷和聚合物。
➢To contol the transformation behavior of austenite, the process of alloying and heat treatment can be used. 为了控制奥氏体的转变特性,可以采用合金化和热处理工艺。
➢The function of a fuse is to protect a circuit. 保险的作用就是保护电路。