化學(xué)常用單詞匯總

1、chapter 1 atomic structureelement n.元素 all know materials can be broken down into fundamental substances we call element.我們所知道的所有物質(zhì)都可以分解成原子。atom n.原子 atom is the smallest particle of matter having all that elements characteristics. 原子時(shí)具有元素性質(zhì)的最小粒子。nucleus /nju:klis，nuklis/ 原子核electron n.電子proton 質(zhì)子ne

2、utron 中子compound n. 化合物：When two or more elements combine and form a compound, a chemical change takes place.當(dāng)兩種或兩種以上的元素結(jié)合形成化合物時(shí), 發(fā)生化學(xué)變化?；瘜W(xué)中的物質(zhì)分為單質(zhì)和化合物，大部分元素是以化合物的形式存在的。ion n. 離子：when an atom get or lost elections,it becomes ion.原子得失電子后形成離子。cathode n. 陰極（negative electrode）Cathode rays are attracted

3、 by a positive charge.陰極射線被陽(yáng)電荷所吸引。anode n. 陽(yáng)極（positive election）A red wire is often attached to the anode.紅色電線通常與陽(yáng)極相聯(lián)。particle n. 粒子：Particles include moleculars,atoms , protons, neutrons ,electrons and ions.微小粒子包括分子，原子，質(zhì)子，中子，電子，離子等等。ionisation n. 電離,離子化：We can get some elementary substance by ionis

4、ation.可以通過(guò)電離的方法來(lái)制取某些單質(zhì)。ionisation energy n.電離能：the energy needed to remove 1 mol of electrons from 1 mol of gaseous atoms .從原子中移走一個(gè)電子所需要的能量。First ionisation energy n.第一電離能 the energy required to remove one electron from each atom in one mole of gaseous atoms is called first ionisation energy,Hi1（201

5、0年真題） as: Ca(g)Ca+(g)+e-;Hi1=+590KJ/molisotope n.同位素：which element have same number of protons ,but different number of neutrons.有相同質(zhì)子數(shù)的元素就是同位素。shielding effect n.屏蔽效應(yīng): electrons in the filled inner shells repel electrons in the outer shell and reduce the effect of the positive nuclear ,this is call

6、ed shielding effect.電子都是帶負(fù)電荷的所以外層的電子受到內(nèi)層電子的一個(gè)排斥力，這就是屏蔽效應(yīng)。 chapter2 atoms molecules and stoichiometryRelative mass n. 相對(duì)質(zhì)量The actual mass of an atom is very small (in the range of 10-20 kg ,for C atomic mass is 1.933×10-20g ). Hence relative mass( where the mass of an atom is compared with the m

7、ass of one reference atom) is used instead.因?yàn)樵颖旧淼馁|(zhì)量很小，計(jì)算使用都很不方便，因此我們采用一個(gè)相對(duì)質(zhì)量，用質(zhì)量和一個(gè)標(biāo)準(zhǔn)物質(zhì)作比較。relative atomic mass n.相對(duì)原子質(zhì)量：elative atomic mass is the mass of an atom relative to 1/12 times the mass of carbon-12, relative atomic mass is a ratio,it has no unit.相對(duì)原子質(zhì)量就是物質(zhì)的質(zhì)量與C-12 原子的1/12 的一個(gè)比值。相對(duì)原子質(zhì)量是一個(gè)

8、比值，沒(méi)有單位。relative isotopic mass n. 相對(duì)同位素質(zhì)量relative isotope mass is the mass of one atom of the isotope relative to 1/12 times the mass of one atom of carbon-12.相對(duì)同位素質(zhì)量就是用同位素的質(zhì)量和1/12 C-12原子的質(zhì)量相比的一個(gè)比值。relative molecular mass n. 相對(duì)分子質(zhì)量As we all know moleculars are all made by atoms so we can get the rel

9、ative molecular mass by adding up the relative atomic mass of all the atoms present in the molecule.相對(duì)分子質(zhì)量就是組成分子的各元素的相對(duì)原子質(zhì)量之和。avogadros constant n. 阿伏伽德羅常數(shù)：The number of atoms in exactly 12g of carbon -12 is 6.02×1023 ，the number is called avogadros constant .12克C-12 所含原子的個(gè)數(shù)是6.02×1023，這個(gè)數(shù)就

10、是阿伏伽德羅常數(shù)empirical formulae n.實(shí)驗(yàn)式：empirical formulae of a compound shows the simplest whole number ratio of the element present.實(shí)驗(yàn)式表示的是分子中原子的最簡(jiǎn)單組成。molecular formulae n.分子式molecular formulae shows the total number of atoms of each element present in a molecule of the compound.分子式表示的是分子中原子的組成。titration

11、 滴定：A titration is a way of measuring quantities of reactants.滴定反應(yīng)是定量測(cè)定的一種方法halogen 鹵素：在元素周期表中含fluorine氟，chlorine 氯，bromine溴，iodine 碘，astatine 砹五種鹵素precipitation n.沉淀:it is a solid.是一種固體物質(zhì)。兩種離子結(jié)合后形成一種微溶或不溶物沉淀下來(lái)。dilute vt稀釋：adding water or something else to decrease the molarities.在溶液中加水或加入其它溶劑使溶液濃度變

12、低。The water will dilute the wine.水能使酒變淡。Molarity n.摩爾濃度：the mol of the substance divided by the volume of the solution ，the unit is mol/dm-3.濃度比上體積就得到我們的摩爾濃度，單位是mol/dm-3chapter3 化學(xué)鍵ionic bond n.離子鍵 The electrostatic attraction between positive ion and negative ion is called ionic bond.正負(fù)離子之間的引力成為離子鍵

13、，如NaClcovalent bond n.共價(jià)鍵 A covalent bond is formed when electrons are shared between two atoms.兩個(gè)原子共用電子形成共價(jià)鍵，如O2metallic bond n.金屬鍵 Metallic bond is an attractive forces between the positive ions and the delocalized electrons.金屬鍵就是金屬陽(yáng)離子和自由電子（離域電子）之間的作用力，它的大小和金屬最外層電子數(shù)有關(guān)，電子數(shù)越多，金屬鍵越強(qiáng)。co-ordinate bond

14、n.配位鍵 In the co-ordinate bond ,one atom provides two electrons that are shared with another atom.thus,the donor atom must have a lone pair of electrons while the acceptor atom must have an empty orbital to accommodate the electrons.一個(gè)原子提供一對(duì)電子，另一個(gè)原子提供一個(gè)空軌道。 hydrogen bond n. 氫鍵 Hydrogen bond are usual

15、ly represented by three dashes: fluorine, oxygen, nitrogen and it is a very strong dipole-dipole attraction.Such as in water:the oxygen atoms have lone pairs of electrons,the hydrogen atom has almost lost both the shared electrons to the oxygen to which it is covalently bonded and this leaves it alm

16、ost bare of electron.實(shí)際上氫鍵也是一種靜電引力，形成氫鍵的分子中必須帶有孤電子對(duì)，電負(fù)性很大，而且原子半徑很小（如N,F,O）?？荚嚂r(shí)要把元素中的孤對(duì)電子標(biāo)出，把分子中的極性標(biāo)出，表示出氫鍵。Van der waal's forces n.范德華力 Instantaneous dipole-induced dipole forces is called Van der waal's forces.瞬間誘導(dǎo)偶極就是分子間作用力。 VSEPR（valence Shell electron pair repulsion）n. 價(jià)層電子互斥理論The shape

17、of simple covalent molecules can be predicted using the valence shell electron-pair repulsion theory. Electron pairs (bond pairs and lone pairs )will repel one anther so that they are as far apart as possible.孤電子對(duì)之間相互排斥，從而使原子呈現(xiàn)一定的空間結(jié)構(gòu)，從而可以根據(jù)價(jià)層電子對(duì)理論來(lái)推測(cè)分子的空間構(gòu)型。permanent dipole /dipole-dipole force n.

18、永久偶極The water molecules are attracted to the charged nylon rod or comb because they have a permanent electric dipole .a force of this type is called a dipole -dipole force.水分子被吸引到了尼龍或梳子上，是因?yàn)樗麄冇辛艘粋€(gè)瞬間的電偶極。像這種力就被稱為由誘導(dǎo)產(chǎn)生的誘導(dǎo)力，也就是永久偶極。temporary dipole/instantaneous dipole n.瞬時(shí)偶極 induce dipole n. 誘導(dǎo)偶極The i

19、nstantaneous dipole - induce dipole is rather like the effect of a magnet on a pin .the pin becomes temporarily magnetised and is attracted to the magnet .the strength of the force increase with the number of electrons and protons present.瞬間誘導(dǎo)偶極就好像靠近磁鐵的大頭針。大頭針有了瞬間的磁性，而被吸引到了磁鐵上，這種瞬間的力隨著質(zhì)子數(shù)，電子數(shù)的增加而增加。

20、 induce vt.引導(dǎo) Her illness was induced by overwork.她的病是操勞過(guò)度引起的。 polarity 極性 Polarity is inherent in a magnet.極性是磁鐵的固有性質(zhì)。chapter4 物質(zhì)狀態(tài)Kinetic energy n. 動(dòng)能The kinetic energy of the molecules in a solid ,liquid or gas is a measure of the amount of random movement of molecules.分子動(dòng)能就是固體，液體，氣體分子做規(guī)則運(yùn)動(dòng)的數(shù)目。Ev

21、aporation n. 蒸發(fā)，發(fā)散，消失 Evaporation is a phase transition from the liquid phase to gas phase that occurs at temperatures below the boiling temperature at a given pressure .and evaporation usually occurs on the surface.蒸發(fā)是一個(gè)在低于沸點(diǎn)的溫度下從液體變?yōu)闅怏w的過(guò)程，蒸發(fā)一般是發(fā)生在液體表面。Vapor pressure n. 氣壓Vapor pressure is the pres

22、sure of a vapor in equilibrium with its non-vapor phase. All liquid and solid have a tendency to evaporate to a gaseous form , and all gases have a tendency to condense back into their original form .at any given temperature ,for a particular substance ,there is a pressure at which the gas of that s

23、ubstance is in dynamic equilibrium with its liquid or solid forms. This is the vapor pressure of that substance at that temperature.氣壓是一種氣液平衡狀態(tài)，液體和固體都有一種蒸發(fā)成氣態(tài)的趨勢(shì)，所有的氣體也都有一種聚集成原始狀態(tài)的趨勢(shì)，。在任何給定的溫度下，對(duì)于一種特殊的物質(zhì)，都有一種氣態(tài)和固態(tài)或液態(tài)成動(dòng)態(tài)平衡的壓力。這種壓力就被稱為在此溫度下的氣壓。melting vt. 融化Melting is a physical process that results i

24、n the phase change of a substance from a solid to a liquid.融化是一個(gè)從固體變成液體的物理過(guò)程。giant molecular lattices n. 大分子晶體 molecular lattices are three dimensional arrangement of atoms held together by strong covalent bonds .some giant molecular structures contain atoms of only one element . 這種大分子晶體是通過(guò)共價(jià)鍵結(jié)合成三維空

25、間排布的晶體。一些大分子晶體只含有一種元素。giant ionic lattices n. 大離子晶體in such a lattice ,there is a regular arrangement of anions and cations ,sodium chloride and magnesium oxide form a cubic lattice ,in which each cations is surrounded by six anions and each anions is surrounded by six cations.在大分子晶體中，陰陽(yáng)離子呈規(guī)則排布，以立方體的

26、氯化鈉和氧化鎂為例，每個(gè)陰離子都被六個(gè)陽(yáng)離子包圍，每個(gè)陽(yáng)離子都被六個(gè)陰離子包圍。ideal gas law n. 理想氣體定律the behaviour of ideal gases is represented by the ideal gas equation :PV=nRT p is the pressure ,measured in pascals ,Pa; V is the volume ,measured in metre cubed ,m3 ; T is the temperature on the Kelvin ;R is the gas constant ,8.314JK-1

27、 mol-1;and n is the 理想氣體符合理想氣體定律。PV=nRTIntermolecular force n.分子間作用力Intermolecular force tend to bring order to the movement of molecules .分子間作用力趨于使分子的運(yùn)動(dòng)有序化。Brownain motion n. 布朗運(yùn)動(dòng)The random movements of the pollen ,known as brownain motion.花粉的這種有序運(yùn)動(dòng)稱為布朗運(yùn)動(dòng)。 Instantaneous dipole forces n. 瞬時(shí)偶極力van de

28、r waals forces n. 范德華力It is one of the features of large molecules that their electron clouds are more spread out , and it is just this type of molecule that has large forces between instantaneous dipoles. There forces are called instantaneous dipole forces ( are also known as van der waals forces).

29、大分子的分子云有一種特點(diǎn)就是他們的分子云會(huì)擴(kuò)散，在他們的瞬間偶極間會(huì)產(chǎn)生一種力叫瞬間偶極力（也叫分子間作用力）。chapter 5 chemical energeticsExothermic adj. 放熱的Most chemical reactions release energy to their surroundings ,these reactions are described as exothermic.一些化學(xué)反應(yīng)會(huì)向環(huán)境釋放能量，這種反應(yīng)稱為放熱的反應(yīng)。Endothermic adj. 吸熱的Some chemical reactions occur only while en

30、ergy is transferred to them an external source. Reactions such as these which require a heat input are endothermic reactions. 一些化學(xué)反應(yīng)需要從外界環(huán)境中吸收能量，這種化學(xué)反應(yīng)為吸熱反應(yīng)。Ehthalpy n. 焓Enthalpy is the total energy content of the reacting materials .it is given the symbol H. enthalpy cannot be measured as such , bu

31、t it is possible to measure the enthalpy change . 焓是反應(yīng)物中所含有的總能量，用H來(lái)表示，焓的數(shù)值不能直接測(cè)得，但可以測(cè)定焓變。Enthalpy change n. 焓變Enthalpy change is given the symbol H ,the units are kilojoules per mole(Kj/mol). H= H products- H reactants Standard conditions n. 標(biāo)準(zhǔn)條件When we compare the enthalpy changes of various reacti

32、ons we must use standard conditions. such as known temperature ,pressures , amounts ,and concentrations of reactions or products .我們?cè)跍y(cè)定不同反應(yīng)物的焓變時(shí)必須是在標(biāo)準(zhǔn)條件下，比如特定的溫度，壓強(qiáng)，反應(yīng)物或產(chǎn)物的數(shù)目和濃度。Standard enthalpy change of reaction n. 標(biāo)準(zhǔn)反應(yīng)焓The standard enthalpy change of reaction is the enthalpy change when amounts

33、of reactants, as shown in the reaction equation, react together under standard conditions to give products in their standard states.標(biāo)準(zhǔn)反應(yīng)焓變就是在反應(yīng)方程式中的反應(yīng)物和產(chǎn)物都在標(biāo)準(zhǔn)條件下反應(yīng)的焓變。Standard enthalpy change of formation n. 標(biāo)準(zhǔn)生成焓The standard enthalpy change of formation is the enthalpy change when one mole of a com

34、pound is formed from its elements under standard conditions , both compound and elements are in their standard states.標(biāo)準(zhǔn)生成焓是由標(biāo)準(zhǔn)狀態(tài)下的元素生成1 mol 化合物的焓變（產(chǎn)物也要在標(biāo)準(zhǔn)狀態(tài)下）Standard enthalpy change of combustion n. 標(biāo)準(zhǔn)燃燒含The standard enthalpy change of combustion is the enthalpy change when one mole of an element

35、or compound reacts completely with oxygen under standard conditions.標(biāo)準(zhǔn)燃燒含是指在標(biāo)準(zhǔn)狀態(tài)下1mol 元素或化合物和氧氣完全反應(yīng)的焓變。 Standard enthalpy change of hydration n. 標(biāo)準(zhǔn)水和焓變The standard enthalpy change of hydration is the enthalpy change when one mole of a gaseous ion dissolves in water to give an infinitely dilute solut

36、ion . 標(biāo)準(zhǔn)水和焓變就是當(dāng)1 mol 氣態(tài)離子溶解在水中生成水溶液放出的能量。Standard enthalpy change of solution n. 標(biāo)準(zhǔn)溶解焓變The standard enthalpy change of solution is the enthalpy change when one mole of a solute dissolves in a solvent to give an infinitely dilute solution. 當(dāng)1 mol 溶劑溶解在水中形成一種稀釋溶液時(shí)所放出的能量就是標(biāo)準(zhǔn)溶解焓變。Standard enthalpy chang

37、e of neutralization n.標(biāo)準(zhǔn)中和焓變The standard enthalpy change of neutralization is the enthalpy change when one mol of H+ ions from an acid is completely neutralized by an alkali to give one mol of water.標(biāo)準(zhǔn)中和焓變是酸中的氫離子被堿溶液完全中和形成1 mol 水。Standard enthalpy change of atomisation n. 標(biāo)準(zhǔn)原子化焓The standard enthalpy

38、 change of atomization of an element is the enthalpy change when one mole of gaseous atoms is formed from one mole of the element in its standard state. 標(biāo)準(zhǔn)原子化焓是在標(biāo)準(zhǔn)條件下生成1摩爾氣態(tài)原子的焓變。Bond enthalpy n. 鍵能Bond enthalpy is the energy needed to break a covalent bond ,and this indicates the strength of the bo

39、nd .鍵能是指破壞一個(gè)共價(jià)鍵所需要的能量，這能表明鍵的強(qiáng)度。Hesss law n. 蓋斯定律The total enthalpy change for a chemical reaction is independent of the route by which the reaction take place, provide the initial and final condition is the same.如果反應(yīng)前和反應(yīng)后的條件完全相同，那總的焓變是相同的和反應(yīng)路徑無(wú)關(guān)。 chapter 6 electrochemistryoxidation states n. 氧化態(tài)oxid

40、ation states are usually calculated as the number of electrons that atoms lose, gain or share when they from ionic or covalent bonds in compounds. 氧化態(tài)通常通過(guò)計(jì)算他們形成共價(jià)化合物或離子化合物時(shí)失去，得到或公用電子的數(shù)目。Redox n. 氧化還原反應(yīng)The term redox is used for the simultaneous processes of reduction and oxidation. 氧化還原反應(yīng)就是用來(lái)描述氧化反應(yīng)和

41、還原反應(yīng)同時(shí)進(jìn)行的過(guò)程。Electrolysis n 電解反應(yīng)When an electric current is passed through a solution of an ionic salt in water, the ions move through the solution and chemical reaction occur at the electrodes. This process is called electrolysis.在離子化合物的水溶液中通電時(shí)，離子會(huì)通過(guò)水溶液在電極上發(fā)生化學(xué)反應(yīng)。這個(gè)過(guò)程就是電解過(guò)程。Anion n. 陽(yáng)離子 （anode 陽(yáng)極）Ca

42、tions n. 陰離子 （cathode 陰極）The anions are attracted to the positively charged anode and the cations are attracted to the negatively charged cathode.陽(yáng)離子被吸引到陰極，陰離子被吸引到陽(yáng)極。Diaphragm cell n. 隔膜電池In the diaphragm cell, a porous（多孔的） asbestos（石棉） diaphragm separate the anode compartment into the anode compar

43、tment.在隔膜電池中，一個(gè)多孔的石棉隔膜把陽(yáng)極室和陰極室隔開(kāi)。Chapter 7 equilibriaEquilibrium n. 化學(xué)平衡It is dynamic at the molecular or ionic level. Both forward and reverse processes occur at equal rates. A closed system is required. Macroscopic properties remain constant. 化學(xué)平衡是在分子離子水平上的動(dòng)態(tài)平衡，正反方向上的反應(yīng)速率相同，需要在封閉體系中進(jìn)行，宏觀性質(zhì)保持恒定。Dyn

44、amic equilibrium n. 動(dòng)態(tài)平衡In general，in a dynamic equilibrium, the rate of reaction in the forwards direction equals the rate of reaction in the reverse direction.通常在動(dòng)態(tài)平衡中正反應(yīng)速率等于逆反應(yīng)速率。 Le Chateliers principle n. 夏特列原理When any of the conditions affecting the position of a dynamic equilibrium are change

45、d, then the position of that equilibrium will shift to minimize that change.當(dāng)外界條件影響動(dòng)態(tài)平衡的方向時(shí)，平衡就會(huì)向減小這種影響的方向移動(dòng)。Equilibrium constant n. 平衡常數(shù) (Kc)Equilibrium constant as the ratio of the product concentrations ( multiplied together ) divided by the reactant concentrations ( multiplied together ). 平衡常數(shù)是反

46、應(yīng)物濃度的乘積比上產(chǎn)物的乘積。Chapter 8 reaction kineticsDetermining step n. 決定步驟It is the slowest step in a mechanism which determines the overall rate of reaction. The slowest step in a reaction mechanism is called the determining step. 在化學(xué)反應(yīng)中，反應(yīng)最慢的一步?jīng)Q定反應(yīng)的總速度，反應(yīng)最慢的這步就成為反應(yīng)的決定步。Colorimeter n. 色度計(jì)The colorimeter me

47、asures the amount of light of a specific colour that passes through a sample.色度計(jì)用來(lái)測(cè)量穿過(guò)樣品的特定顏色的光線數(shù)量。Effective collision n. 有效碰撞Effective collision occur when the kinetic energy of the colliding molecules provides sufficient energy for reaction.當(dāng)碰撞分子的動(dòng)能提供了足夠的反應(yīng)能量時(shí)的碰撞稱為有效碰撞。Boltzmann distribution n. 波爾

48、茲曼分布The Boltzmann distribution represents the number of particles with particular energies.波爾茲曼分布指的是有特定能量的分子的數(shù)目。Activation energy n. 活化能Molecules have to collide with a certain minimum energy Ea for there to be a chance of reaction. Ea is referred to as the activation energy.分子碰撞發(fā)生化學(xué)反應(yīng)所需要的最小的能量稱為活化能

49、。Catalyst n. 催化劑A catalyst is something added to a reaction that increase its rate, but dose not itself change in concentration, the same amount remains after the reaction as before.催化劑是用來(lái)加入反應(yīng)中加快反應(yīng)速度的，而催化劑本身不發(fā)生變化。Enzyme n. 酶Enzymes are proteins that act as biological catalysts.酶是一種蛋白質(zhì)生物催化劑。 Chapter

50、9 chemical periodicityCovalent radius n. 共價(jià)半徑Covalent radius is half the distance between the nuclei of neighbouring atoms in molecules.共價(jià)半徑是分子中兩個(gè)相鄰原子距離的一半。Metallic radius n. 金屬半徑Metallic radius is half the distance between the nuclei of neighbouring atoms in metallic crystals.金屬半徑是金屬晶體中兩個(gè)原子間距離的一般。A

51、tomic radius n. 原子半徑 The covalent radius can be measured for most elements and is usually what is meant when we use the term atomic radius.對(duì)于大多數(shù)元素的共價(jià)半徑能通過(guò)測(cè)量得到，這也就是我們通常說(shuō)的原子半徑。Siemens n. 西門子Siemens are the reciprocal of the units of electrical resistance.西門子是電阻的倒數(shù)。S=-1 Conductivity n. 導(dǎo)電性Conductivity

52、values give an indication of how easily electrons move through the element.導(dǎo)電性表示某種元素中電子的活動(dòng)性Chapter 10 group Hard water n. 硬水Hard water contains dissolved calcium ions.硬水中含有鈣離子。Chapter 11 Group 7Disproportionation n. 不均勻的，歧化反應(yīng)A particular type of redox reaction in which one species is oxidised and re

53、duced at the same time. 一種特殊的氧化還原反應(yīng)，一種物質(zhì)被氧化，同時(shí)被還原 。Chapter 7 equilibriaStrong acid n. 強(qiáng)酸Strong acid is fully dissociated to ions in aqueous solution.在水溶液中完全電離的酸為強(qiáng)酸。Weak acid n. 弱酸Weak acid is the acid that their molecules are only partically ionized in aqueous solution.弱酸是在水溶液中部分解離的酸。Chapter 15 intr

54、oduction to organic chemistryHydrocarbons n. 碳?xì)浠衔顲ompounds that contain only carbon and hydrogen atoms are known as hydrocarbons.只含有碳原子和氫原子的化合物稱為碳?xì)浠衔?。Aromatic n. 芳香族的Aromatic compounds n. 芳香族化合物Aromatic compounds contain one or more arene rings. They are called aromatic compounds as they have dist

55、inctive , usually pleasant, smells.芳香族化合物又一個(gè)或多個(gè)苯環(huán)，因?yàn)樗麄冇惺谷擞鋹偟臍馕叮环Q為芳香族化合物。Aliphatic compounds n. 脂肪族化合物All other compounds are aliphatic compounds except aromatic compounds.除了芳香族化合物其他的都是脂肪族化合物。Molecular formula n. 分子式A molecular formula simply shows the number of atoms of each element present in the

56、 molecular formula of hexane is C6H14。分子式簡(jiǎn)單的表示了分子中各種原子的數(shù)目。General formula n. 通式 A general formula may be written for each series of compounds. For example, the general formula for the alkanes is CnH2n+2 (where n is the number of carbon atoms present).通式用來(lái)表示同一系列的化合物，例如：烷烴的通式是 CnH2n+2（n表示碳原子的數(shù)目）Struct

57、ural formula n. 結(jié)構(gòu)式This shows how the atoms are joined together in a molecule. The structure formula of hexane is CH3CH2CH2CH2CH2CH3. 結(jié)構(gòu)式表示的是原子如何結(jié)合在一起形成分子的。己烷的結(jié)構(gòu)式是：CH3CH2CH2CH2CH2CH3. Displayed formula n. 展開(kāi)式 This shows all the bonds and all the atoms. The displayed formula of hexane is: One of their disadvantages is that they are two-dimension