AQA A Level Chemistry复习笔记3.3.3 Ozone Depletion
Uses Fluorohalogenoalkanes The most common halogenoalkanes are chlorofluorocarbons (CFCs) These compounds contain carbon atoms with chlorine and fluorine atoms attached to them E.g. CCl3F an...
AQA A Level Chemistry复习笔记3.3.2 Reactions of Halogenoalkanes
The Key Reactions of the Halogenoalkanes Types of Reactions that halogenoalkanes undergo: Halogenoalkanes are much more reactive than alkanes due to the presence of the electronegative halog...
AQA A Level Chemistry复习笔记3.2.4 Chlorination of Alkanes
Free Radical Substitution Free-radical substitution of alkanes Alkanes can undergo free-radical substitution in which a hydrogen atom gets substituted by a halogen (chlorine/bromine) Since ...
AQA A Level Chemistry复习笔记3.2.3 Combustion of Alkanes
Combustion Alkanes are combusted (burnt) on a large scale for their use as fuels Complete combustion When alkanes are burnt in excess (plenty of) oxygen, complete combustion will take place ...
AQA A Level Chemistry复习笔记3.2.2 Modification of Alkanes by Cracking
Cracking Alkanes are hydrocarbons that can be produced by the addition reaction of hydrogen to an alkene or by cracking of longer alkane chains Crude oil Crude oil is a mixture of hydrocarbo...
AQA A Level Chemistry复习笔记3.1.5 Stereoisomerism
Stereoisomerism: Geometrical Isomerism Stereoisomers are compounds that have the same atoms connected to each other, however the atoms are differently arranged in space There are two types o...
AQA A Level Chemistry复习笔记3.1.4 Structural Isomerism
Molecules: Straight, Branched & Cyclic Straight, branched and cyclic organic molecules are also called aliphatic compounds as long as they do not contain a benzene ring Straight-chain St...
AQA A Level Chemistry复习笔记3.1.3 Nomenclature
Nomenclature Systematic nomenclature can be used to name organic compounds and therefore make it easier to refer to them The alkanes provide the basis of the naming system and the stem of ea...
AQA A Level Chemistry复习笔记3.1.2 Types of Formulae
Types of Formulae The general formula is a formula that represents a homologous series of compounds using letters and numbers Eg. the general formula of alkanes is CnH2n+2 A homologous serie...
AQA A Level Chemistry复习笔记2.3.4 Uses & Reactions of Chlorine
Reactions of Halide Ions A disproportionation reaction is a reaction in which the same species is both oxidised and reduced The reaction of chlorine with dilute alkali is an example of a dis...
AQA A Level Chemistry复习笔记2.3.3 Testing for Halide Ions
Testing for Halides Silver ions & ammonia Halide ions can be identified in an unknown solution by dissolving the solution in nitric acid and then adding silver nitrate solution dropwise ...
斯坦福及藤校新生成绩分布！美国TOP大学偏好录取什么成绩的学生？
美国大学入学人数跌破记录了！ 明明申请竞争那么激烈， 到底是什么情况？ 据美国国家学生信息中心（National Student Clearinghouse Research Center）最新数据显示：2022年春季本科入学人数相较去年减少了66.2万...
