CB推出的AP新科目AP预备微积分，对中国AP学生的意义在哪里？
CB官网更新，新增AP科目Pre-calculus（预备微积分）。该课程将于2023年秋季推出，2024年加入到AP考试中。 根据CB的说法，好多高中学生，高中时候数学基础不好，进入大学后开始学习大学数学内容（主要为微积分）就...
AQA A Level Chemistry复习笔记3.7.1 Fundamentals of Reaction Mechanisms
Reaction Mechanisms: Terminology Homolytic & Heterolytic fission Homolytic fission is breaking a covalent bond in such a way that each atom takes an electron from the bond to form two ra...
AQA A Level Chemistry复习笔记3.6.1 Identification of Functional Groups by Test-Tube Reactions
Test-Tube Reactions Often, chemists will need to identify the functional groups present in an organic compound Some simple questions which can be considered are: Is the compound acidi...
AQA A Level Chemistry复习笔记3.5.1 Classifying Alcohols
Classification of Alcohols Primary alcohols are alcohols in which the carbon atom bonded to the -OH group is attached to one other carbon atom (or alkyl group) Secondary alcohols are alcohol...
AQA A Level Chemistry复习笔记3.4.1 Structure, Bonding & Reactivity
Shapes & Bond Angles in Organic Molecules Each carbon atom has four electrons in its outer shell (electronic configuration: 1s22s22p2) Carbon atoms share these four electrons in four cov...
Edexcel IGCSE Maths复习笔记 1.10.1 Rounding & Estimation
Edexcel IGCSE Maths复习笔记 1.10.1 Rounding & Estimation Why use estimation? We estimate to find approximations for difficult sums Or to check our answers are about the right size (right order ...
AQA A Level Chemistry复习笔记3.3.1 Reactivity of Halogenoalkanes
Reactivity of Halogenoalkanes The halogenoalkanes have different rates of substitution reactions Since substitution reactions involve breaking the carbon-halogen bond the bond energies can b...
AQA A Level Chemistry复习笔记3.2.1 Fractional Distillation of Crude Oil
Fractional Distillation Crude oil is currently the world's main source of organic chemicals As a mixture, it isn’t a very useful substance, but the different hydrocarbons that make up the mixture, ...
AQA A Level Chemistry复习笔记3.1.1 Functional Groups
Organic Definitions & Terminology Organic chemistry is the chemistry of carbon compounds Carbon forms a vast number of compounds because it can form strong covalent bonds with itself This enabl...
