第762页-翰林严选-翰林国际教育

ALL

翰林严选

2022-23CTB全球创新研究大挑战火热组队中，全新课题等你来解锁！

2022-09-13

CTB 全球创新研究大挑战来啦！关注PBL赛事的家长和同学，CTB这个赛事对大家应该并不陌生。China Thinks Big（简称CTB），由哈佛商学院和清华大学经管学院学者联合启动，是以学术研究和社会实践推动社会创新的国际...

Edexcel A Level Chemistry:复习笔记2.2.2 Reactions of Group 2

2022-09-13

Group 2 Elements Reactions with water and oxygen The reaction of group 2 metals with oxygen follows the following general equation: 2M (s) + O2 (g) → 2MO (s) Where M is any metal in group 2 ...

Edexcel A Level Chemistry:复习笔记2.2.1 Explaining Group 2 Trends

2022-09-13

Ionisation Energy Chemical trends All elements in Group 2 (also called alkali earth metals) have two electrons in their outermost principal quantum shell All Group 2 metals can form ionic co...

Edexcel A Level Chemistry:复习笔记2.1.4 Ionic Equations

2022-09-13

Writing Chemical Formulae Oxidation numbers are a useful tool for naming compounds as some elements can exist with more than one oxidation number For compound with two elements it is straigh...

Edexcel A Level Chemistry:复习笔记2.1.3 Redox & Disproportionation

2022-09-13

Disproportionation Disproportionation reactions A disproportionation reaction is a reaction in which the same species is simultaneously oxidised and reduced Example of a disproportion reacti...

Edexcel A Level Chemistry:复习笔记2.1.2 Types of Reduction & Oxidation

2022-09-13

Electron Transfer & Change in Oxidation Number Oxidation and reduction in a reaction can be demonstrated in terms of electron transfer For example: 2NH3 + 3Br2 → N2 + 6HBr The oxidation ...

Edexcel A Level Chemistry:复习笔记2.1.1 Oxidation Number

2022-09-13

Defining Oxidation Number There are three definitions of oxidation and reduction used in different branches of chemistry Oxidation and reduction can be used to describe any of the following...