哈佛大学2022推荐书单，10本电子书免费领！
开学季来临！大家是不是“书荒”了呢？ 哈佛大学发布2022暑期书单 各学院教授每年都会推荐一些经典读物 相信每位同学都能 在这个列表中找到喜欢的那本书！ www.harvard.edu/in-focus/summer-reads/book-recommendat...
Edexcel A Level Chemistry:复习笔记3.6.2 Infrared (IR) Spectroscopy
Interpreting an IR Spectrum Infrared (IR) spectroscopy is a technique used to identify compounds based on changes in vibrations of atoms when they absorb IR of certain frequencies A spectrop...
Edexcel A Level Chemistry:复习笔记3.6.1 Mass Spectrometry
Mass Spectrometry Mass spectroscopy is an analytical technique used to identify unknown compounds The molecules in the small sample are bombarded with high energy electrons which can cause t...
Edexcel A Level Chemistry:复习笔记3.5.3 Organic Liquid Preparation & Purification
Organic Liquid Preparation & Purification Simple Distillation This is used to separate a liquid and soluble solid from a solution (e.g. water from a solution of salt water) or a pure liq...
Edexcel A Level Chemistry:复习笔记3.5.2 Reactions of Alcohols
Reactions of Alcohols Combustion of alcohols Alcohols react with oxygen in the air when ignited and undergo complete combustion to form carbon dioxide and water alcohol + oxygen → carbon dio...
Edexcel A Level Chemistry:复习笔记3.5.1 Classifying Alcohols
Classifying Alcohols Alcohols are a family of molecules that contain the hydroxyl functional group, -OH Their general formula is CnH2n+1OH The nomenclature of alcohols follows the pattern a...
Edexcel A Level Chemistry:复习笔记3.4.5 Reactivity of Halogenoalkanes
Reactivity of Halogenoalkanes Nucleophilic substitution reactions can occur in two different ways (known as SN2 and SN1 reactions) depending on the structure of the halogenoalkane involved T...
Edexcel A Level Chemistry:复习笔记3.4.4 Hydrolysis of Halogenoalkanes
Relative Rates of Hydrolysis Measuring the rate of hydrolysis Acidified aqueous silver nitrate can be used to measure the rate of hydrolysis of halogenoalkanes The following method is used: ...
Edexcel A Level Chemistry:复习笔记3.4.3 Nucleophilic Substitution Mechanism
Nucleophilic Substitution: Mechanisms A nucleophilic substitution reaction is one in which a nucleophile attacks a carbon atom which carries a partial positive charge An atom that has a part...
