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...
AQA A Level Chemistry复习笔记2.3.2 Chemical Properties of Group 7
Halogens: Oxidising Agents Halogens react with metals by accepting an electron from the metal atom to become an ion with 1- charge Eg. Ca (s) + Cl2 (g) → CaCl2 (s) consisting of Ca2+ and ...
2022马歇尔经济学会写作比赛题目已公布，新赛季报名开启！
马歇尔学会是剑桥大学的经济学会，马歇尔经济学会写作比赛（Marshall Society Essay Competition）是面向A-level、IB和其他体系学生打造的写作比赛，要求学生利用现实世界的相关论据对经济理论进行充分解释和合理...
AQA A Level Chemistry复习笔记2.2.4 Uses of Group 2 Elements
Uses of Group 2 Three different calcium compounds are used commonly in agriculture, construction and iron extraction: Limestone - this is impure calcium carbonate Quicklime - this is calcium...
AQA A Level Chemistry复习笔记2.2.3 Reactions of Group 2
Reactions of Group 2 The group 2 elements react with oxygen, water and dilute acids Group 2 Reactions - Observations Reactions with water and oxygen The reaction of group 2 metals wit...
AQA A Level Chemistry复习笔记2.2.2 Solubility of Group 2 Compounds: Hydroxides & Sulfates
Solubility of Hydroxides & Sulfates Group 2 hydroxides Going down the group, the solutions formed from the reaction of group 2 oxides with water become more alkaline When the oxides are ...
