epq课程是什么意思？EPQ课程有必要学吗？
今天老师要和大家介绍一门不需要考试的课程—EPQ。epq课程是什么意思？是否有必要学习？含金量如何？ 什么是EPQ？ EPQ是英国考试局(Edexcel, OCR, AQA and CIE)提供的带证书的项目课程，项目所得分数相当于半个学...
A-level 2022年A*率排名前三的科目！
CAIE 2022年A-Level夏季大考A*率终于出炉！和2021年相比，今年高数、生物等科目压分严重，位居A*率榜首的是中文，A*率达到了63.2%。今天我们就来详细介绍一下2022年A*率排名前三的中文、高数、化学科目~ 一、中文...
Edexcel A Level Chemistry:复习笔记2.3.4 Halide Ion Reactions
Halide Ion Reactions Concentrated sulfuric acid Chloride, bromide and iodide ions react with concentrated sulfuric acid to produce toxic gases These reactions should therefore be carried out...
Edexcel A Level Chemistry:复习笔记2.3.3 Halogen Redox Reactions
Halogen Redox Reactions Reactions with Group 1 & 2 metals The halogens react with some metals to form ionic compounds which are metal halide salts In all reactions where halogens are rea...
Edexcel A Level Chemistry:复习笔记2.3.2 Halogen Displacement Reactions
Halogen Displacement Reactions The reactivity of halogens is also shown by their displacement reactions with other halide ions in solutions A more reactive halogen can displace a less reacti...
Edexcel A Level Chemistry:复习笔记2.3.1 Group 7 Trends
Physical Properties The Group 7 elements are called halogens The halogens have uses in water purification and as bleaching agents (chlorine), as flame-retardants and fire extinguishers (brom...
Edexcel A Level Chemistry:复习笔记2.2.5 Flame Tests
Flame Tests Metal ions produce a colour if heated strongly in a flame Ions from different metals produce different colours The flame test is thus used to identify metal ions by the colour of...
Edexcel A Level Chemistry:复习笔记2.2.4 Group 2 Carbonates & Nitrates
Group 2 Carbonates & Nitrates Thermal decomposition is the breakdown of a compound into two or more different substances using heat Thermal decomposition of carbonates The Group 2 carbon...
Edexcel A Level Chemistry:复习笔记2.2.3 Group 2 Hydroxides & Sulfates
Group 2 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 dissol...
