A-Level化学 Organic chemistry中比较难理解的就是反应机理(Mechanism)。要想理解反应机理,为大家总结17个必备定义哦!
Functional group
a group of atoms responsible for the characteristic reactions of an organic compound.
Homolytic fission
the splitting of a covalent bond where each atom retains one electron from the bonding pair.
Heterolytic fission
the splitting of a covalent bond where one atom retains both electrons from the bonding pair.
Free radical
an uncharged molecule with an unpaired electron.
Initiation
an initial chemical reaction which triggers further reactions.
Propagation
a secondary reaction where there is no net gain or loss of free radicals.
Termination
the final step in a chain reaction where a reactive intermediate is rendered inactive.
Nucleophile
a molecule or substance that donates electrons.
Electrophile
a molecule or substance that acts as an electron pair acceptor.
Addition
a reaction where two or more molecules react to form a larger molecule.
Substitution
a reaction where an atom or group is replaced by another atom or group.
Elimination
a reaction in which two substituents are removed from a molecule in a mechanism with one or two steps.
Hydrolysis
the splitting up of a compound or molecule using water.
Hydrolysis
the splitting up of a compound or molecule using water.
Condensation
the formation of a compound with the release of water.
Oxidation
the formation of a compound with the release of water.
Reduction
gain of electrons.
以上就是小编为大家整理的关于A-Level化学考试有机反应机理要点,希望对大家有所帮助。更多A-Level考试题目下载、A-Level成绩查询网站等问题可以咨询我们。
A-level考试报名须知是必须要懂得,这样在面对英国A-level入学考试的时候自己也知道应该怎么面对。小北整理了一些考试的相关资讯,一起去看看吧。