IGCSE课程难度如何？IGCSE六大学科难度盘点！
IGCSE课程难度如何？ 客观来说，这个问题无法一概而论。每个学科都有不同的课程体系和考试特点，我们还是要具体问题具体分析。 今天我们以CIE考试局为例，针对IGCSE几大热门学科，为大家做下全方位的难度解析。 ...
IB DP Chemistry: HL复习笔记10.2.10 Alcohols - Oxidation
Oxidation of Primary Alcohols The products of oxidation of alcohols depends on the class of alcohols Here is a reminder of the three classes of alcohols: The three classes of alcohols Primary alcoh...
AQA A Level Maths: Pure复习笔记3.1.3 Equation of a Straight Line
Equation of a Straight Line What is the equation of a straight line? y = mx + c is the equation for any straight line m is gradient given by “difference in y” ÷ “difference in x” or dy/dx c is the ...
IB DP Chemistry: HL复习笔记10.2.9 Alcohols - Combustion
Combustion of Alcohols Alcohols react with oxygen in the air when ignited and undergo complete combustion to form carbon dioxide and water Alcohol + oxygen → carbon dioxide + water Complete combust...
IB DP Chemistry: HL复习笔记10.2.8 Addition Polymers
Polymers Addition polymerisation Addition polymerisation is one of the most important addition reactions of alkenes which form the basis of the plastic industry Addition polymerisation is the react...
IB DP Chemistry: HL复习笔记10.2.7 Alkenes - Hydration
Hydration of Alkenes When alkenes are treated with steam at 300 oC, a pressure of 60 atmospheres and sulfuric acid (H2SO4) or phosphoric acid (H3PO4) catalyst, the water is added across the double ...
IB DP Chemistry: HL复习笔记10.2.6 Alkenes - Hydrohalogenation
Hydrohalogenation of Alkenes Alkenes will react readily with hydrogen halides such as HCl and HBr to produce halogenoalkanes This reaction is known as hydrohalogenation It is also an electrophilic...
IB DP Chemistry: HL复习笔记10.2.5 Alkenes - Halogenation
Halogenation of Alkenes The reaction between alkenes and halogens is known as halogenation It is an example of an electrophilic addition where an electrophile ('electron seeker') joins onto to a do...
IB DP Chemistry: HL复习笔记10.2.4 Alkenes - Hydrogenation
Hydrogenation of Alkenes Alkenes are very useful compounds as they can undergo many types of reactions They can therefore be used as starting molecules when making new compounds The reaction betwee...
IB DP Chemistry: HL复习笔记10.2.3 Alkenes - Reactivity
Reactivity of Alkenes Alkenes are hydrocarbons containing a carbon-carbon double bond The atoms around the carbon-carbon double bond adopt a planar arrangement and the bond angle is 120o The bondin...
IB DP Chemistry: HL复习笔记10.2.2 Alkanes - Halogenation
Halogenation of Alkanes Free-radical substitution of alkanes Alkanes can undergo free-radical substitution in which a hydrogen atom gets substituted by a halogen (chlorine/bromine) Since alkanes a...
IB DP Chemistry: HL复习笔记10.2.1 Alkanes - Combustion
Unreactive Alkanes Strength of C-H bonds Alkanes consist of carbon and hydrogen atoms which are bonded together by single bonds Unless a lot of heat is supplied, it is difficult to break these stro...
