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翰林嚴選

2022-23CTB全球創新研究大挑戰火熱組隊中，全新課題等你來解鎖！

2022-09-13

CTB 全球創新研究大挑戰來啦！關注PBL賽事的家長和同學，CTB這個賽事對大家應該并不陌生。China Thinks Big（簡稱CTB），由哈佛商學院和清華大學經管學院學者聯合啟動，是以學術研究和社會實踐推動社會創新的國際...

Edexcel A Level Chemistry:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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...