queenwendy
To begin with, chemistry is known as the central science, which means it has close relationship with almost every field of modern science. With the development of mathematics and physics, approaches and theories of chemistry research is eminently advanced while applied chemistry promotes the research works of biology, enviromental science, information technology, etc. It was alleged that 20th century is the century of physics and 21th century is the century of life science and information science. However, thanks to the proposal of quantum theory, theoretical chemistry was greatly boosted and similarly, without the improvement of chemistry, especially analytical and synthetical methods, life science and information technology will face their bottlenecks. Thus, it can be claimed that both 20th and 21th centuries can be considered as the centuries of chemistry.Secondly, chemistry permeates into nearly every corner of human life and society. For example, a large part of clothing manufactured today are at least partly made of synthetic fiber and stained by organic dyes. Besides, there can hardly find any food without additives. Moreover, though the utilization of artificial fertilizers and pesticides are criticized a lot, without these things, most of human beings on this planet would suffer from famine. In addition, advanced materials provides firmer packages, warmer houser, and safer transportation.The last but not the least, chemistry is the discipline which I love. As is known to all, interest is the best teacher. Therefore, I believe I can learn it well. That's why I choose it as my major.化学专业本科生飘过,肺腑之言。
隔壁老袁无敌
许多已知的冰阶段表现出了质子订购 转型,例如从质子无序 六角冰(星期四)以质子下令冰十一.1最近,两个 新质子命令冰阶段(十三和十四)已reported2 有关冰第五和第十二, respectively.Preparation若干冰 阶段并不简单,这解释了为什么直到最近, 只有一个新的冰阶段已经发现在过去20 years.3 特别是,排列形式的冰可能难以孤立内 该实验室因为动力学障碍分子轮换 是重要的低temperatures.Computer仿真提供了一个 辅助方法,在其中的影响,压力,温度, 和配置可以名义上控制十分精确,以 允许系统测绘阶段diagram.However的 Verity的任何模拟方法取决于其生育能力 不同的国家分相diagram.As挑战理论, 我们最近进行了一项双盲试验预测质子有序 形式的冰第十二称为冰十四。 虽然每个冰氧原子必须四面体协调员 化(在一个完美的网格) ,氢原子可能是无序的。 安排的质子在一个冰结构的确定 由贝尔纳福勒冰rules4其中规定: ( 1 )必须有 两个氢原子毗邻每个氧气和( 2 )必须有 只有一个氢每表明,氢bond.Pauling5 任何冰阶段大约有( 3 / 2 )不适用何种方式 氢原子可安排,并建议所有可能的 结构的某一阶段是degenerate.However ,存在 质子命令无效这一阶段postulate.The质子 命令阶段有不同的特性从无序母公司 阶段,例如,冰七可以转化为质子下令冰 八的相关变化,晶胞参数和密度。
石门小可爱
喔 顺便一提,我现在学的ABC天卞口语的老师说过,如果要掌握好英语是不难的!必然有个好的研习环境与闇练口语对象 最关键就是外教水平,口语纯正才是最好 保持经常口语练习 1&1针对性教学才可以有更.好.的进步效率;上完课记得重听课堂音频,把所学知识融会贯通~若真的是没有人可以指导的话 只能上旺旺或大耳朵获取课外教材研习,多问多听短时间语境会提高起来,整体效果应该可以迅速明显的;这些是考试词汇,应该有用Part1foundationchemistry基础化学Chapter1acid酸apparatus仪器,装置asueoussolution水溶液arrangementofelectrons电子排列assumption假设atom原子(化学变化中的最小粒子)atomicmass原子量atomicnumber原子序数atomicradius原子半径atomicstructure原子结构becomposedof由……组成bombardment撞击boundary界限cathoderays阴极射网cathode-rayoscilloscope(C.R.O)阴极电子示波器ceramic陶器制品charge-clouds电子云charge-to-massratio(em)质荷比(质谱分析时样品质量的测量以质量与其离子电荷之比表示)chemicalbehaviour化学行为chemicalproperty化学性质(物质在化学变化中表现出来的性质)clockwise顺时针方向的compound化合物(由不同元素组成的纯净物)configuration构型copper铜correspondto相似corrosive腐蚀d-blockelementsd区元素deflect使偏向,使转向derivefrom源于deuterium氘diffusemixture扩散混合物distanceeffect距离效应distil蒸馏distinguish区别distribution分布doublycharged(+)ion正二介离子dye染料effectofelectriccurrentinsolutions电流在溶液里的影响electricalcharge电荷electricalfield电场electricallyneutralatom电中性原子electri电electrolysis电解electron电子(负电荷粒子,电量等于.×10-10绝对静电单位)electronselding电子屏蔽element元素(具有相同核电荷数即荷内质子数的一类原子的总称)emissionspectrum发射光谱(根据发射光源和激发能量方式所产生的特征电磁波谱)energylevel能态,能级(稳态能量,有相同主量数的电子壳层)fertiliser肥料firstioniionenergy一级电离能fluorescentscreen荧光屏fluoride氟化物fuel燃料fundamentalsubstance基础物质fuzzy模糊的galaxy星系,银河gas气体gaseousstate气态gravity重力GroupⅠ第一族Heisenberg’suncertaintyprinciple海森堡测不准原理hydrofluoricacid氢氟酸identical同一的,相等的intermsof根据,在……方面innermost最内的,最深的interaction相互作用internalstructure内部结构interpret解释investigate研究,调查ioniionenergy电离能(从原子或分子中移走一个电子至无穷远处所需的能量,以电子伏特eV表示)ionise电离isotope同位素(原子里具有相同的质子数和不同的中子数的同一元素的原子互称同位素)J.J.Thomson’semexperiment汤姆森质何比实验Latin拉丁lepton轻粒子lisuid液体magnet磁铁magneticfield磁场MalteseCross马耳他十字marble大理石massnumber质量数matter物质metalfoil金箔meteorite陨星microbe微生物,细菌Millikan’s‘oil-drop’ecperiment密立根油滴实验model-building模型建筑mole摩尔(表示一个系统的物质的量的单位,该系统中所包含的基本单元数与1g碳1即1C的原子数目相等,每摩尔物质含有阿佛加德罗常数个微粒)molecule分子(保持物质的化学性质的最小粒子)narrowbeam狭窄的光网negativeelectrode(cathode)阴极negligible可以忽略的neutron中子nitrate硝酸盐noblegas稀有气体normalpressures常压nuclearcharge(原子)核电荷nuclearmodelforatoms原子核模型nuclearreaction核反应nucleus(pl.nuclei)核Orbital轨道paraffinwax石蜡particle微粒,粒子Pauliexclusionprinciple保里不相容原理(每个原子轨道至多只能容纳两个电子;而且,这两个电子自旋方向必须相反)PeriodicTable周期表physicalproperty物理性质(物质不需要发生化学变化就表现出来的性质,如颜色、状态、气味、熔沸点、密度等)plastics塑料plum-pudding李子布丁positivecharge正电荷(带有质子的物质,用丝绸摩擦玻璃棒,在棒上会产生正电荷)positiveelectrode(anode)阳极positivelychargedparticle(ion)离子potentialdifference电位prediction预言principalsuantumnumber主量子数(标示轨道电子的波函数,包括轨道角动量和自旋量子数,电子的能级和距原子核的平均距离主要取决于主量子数)probe探测,探究protium氕proton质子suantum(pl.suanta)量子(一个电子转移到原子的下一层轨道时发出的有限辐射能单位)suantummechanics量子力学suantumTheory量子理论suark夸克(组成基本粒子的更小的粒子)radioactivesource放射源repel排斥repulsion斥力respectively分别地rung梯级scatteringeffect散射作用Schr?dingeresuation薛定谔(波动)方程(一偏微分方程,描述基本粒子波动性)scintillation火花shell电子壳层seldingeffect屏蔽效应simplersubstance单质(指由同种元素组成的纯净物)solid固体sphere球spin自旋stablestate稳态sub-atomicparticle原子内的粒子subset子集,小团体successiveioniionenergy逐级电离能symbol符号symmetry对称thelowest-energyorbitals最低能量轨道transitionelements过渡元素tritium氚X-rayX射网α-particlesα粒子,即alpha-particle(带有两个质子和中子的粒子,即氦原子核,对物质的穿透力较强,流速约为光速的110)α-rayα射网β-particlesβ粒子β-rayβ射网γ-patticlesγ粒子γ-rayγ射网
五堂宅修
impossible between members of different species because genitals of males and females are structurally incompatible or because molecules on the surfaces of sperm and egg fail to bind. A final type of prezygotic mechanism is temporal isolation, in which time-related environmental cues that trigger reproductive processes are different for related species.有时,产生前合子隔离的差异涉及了隔离机制。即,由于生殖器结构不匹配或精卵分子表面不结合而使不同种群成员间不能自然结合。最后一类前合子机制是暂时隔离,与时间有关的环境因素触发了相关物种的不同繁殖过程。
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