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AS化学常考定义分享 这些英文版的定义更值得记忆

09-13

秋季大考就在眼前了,下面来给大家分享一些有关AS化学常考定义,这些定义都是英文版本的,希望大家都能够早日熟悉这些专业用语啊!

AS化学常考定义分享  这些英文版的定义更值得记忆内容图片_1

standard enthalpy change of combustion

the enthalpy/energy change when one mole of a substance

is burned in an excess of air/oxygen or completely combusted

under standard conditions 

activation energy

the minimum energy  required

in order for the reaction to take place

acid

A proton(H+) donor

weak acid

(an acid that is) partially / incompletely ionised/ dissociated

dynamic equilibrium

an equilibrium which forward reaction rate quals backward reaction rate or forward/back reactions occurring but concentrations of all species do not change

isotope

atoms with the same number of protons

but different number of neutrons

strong acid

(an acid that is) completely ionised/ dissociated

relative atomic mass

average mass of an atom of an element

compared with C -12

one atom of C-12 has a mass of exactly 12

chiral centre

chiral centre is a carbon  atom that bonds to four different groups or atoms 

first ionisation energy

Energy required to remove one mole of electrons

from  one mole of gaseous atoms of an element  

Relative isotopic mass

Mean/average mass of  an atom relative to 1/12 the mass of an atom of C-12 

AS化学常考定义分享  这些英文版的定义更值得记忆内容图片_2

Isotope

Atoms with the same number of protons and different number of neutrons 

Atomic number 

Proton number or number of protons 

Mass number

Nucleon number; total number of protons and neutrons 

First ionisation energy 

The amount of energy required to remove one electron from each atom in one mole of atoms of the element in the gaseous state (to form gaseous 1+ ions). 

Ionic bonding

Attraction/attractive force between positively and negatively charged ions in an ionic lattice. 

Covalent bonding

Attraction between nucleus and shared pair of electrons. 

Dative covalent bonding

One atom provides both electrons in the formation of the covalent bond. 

Sigma bond (σ bond)

Sigma bonds are formed by end-on overlap of atomic orbitals. 

Pi bond (Π bond)

Pi bonds are formed by sideways overlap of p-type atomic orbitals. 

对于目标排名靠前的化学相关专业的同学来说,最好能考到化学A*或者A,以此来证明你的学术能力。如果你也喜欢化学,但找不到适合自己的学习方法,可以点击预约试听【ALEVEL同步培优班】——

AS化学常考定义分享  这些英文版的定义更值得记忆内容图片_3

点击

不解决这些Alevel化学学习难点 你的化学如何拿到A星

50个Alevel化学专业词汇分享 想学好化学先了解这些词汇

查看。

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Beara Zhao

香港科技大学分析化学硕士

香港科技大学分析化学硕士

·  所属专业全球排名前列,大学在校期间多次获得一等奖学金,并参与过多项化学及生物学术研究项目,发表过多篇专业论文,专业素养过硬

·  精通IB、AP、A-Level三大课程体系,对各国中学体系的化学课程均有深入理解

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