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翰林AP 6大热门学科讲座来啦！最全AP学习辅助和免费真题资料助你备考无忧！

2022-09-09

面对竞争激烈的美本留学环境作为必要的申请“武器”——AP成绩能增加GPA成绩、换大学学分受到越来越多的同学及家长关注而AP科目众多，备考内容繁杂如何高效、全面地掌握知识点，获得高分？冲刺5分！加入翰林AP...

Edexcel A Level Chemistry:复习笔记1.9.2 Calculating Rates of Reaction

2022-09-09

Calculating Rates of Reaction To measure the rate of a reaction, we need to be able to measure either how quickly the reactants are used up or how quickly the products are formed The method ...

Edexcel A Level Chemistry:复习笔记1.9.1 Collision Theory & Rates

2022-09-09

Collision Theory & Rates Collision Theory When reactants come together the kinetic energy they possess means their particles will collide and some of these collisions will result in chem...

Edexcel A Level Chemistry:复习笔记1.8.5 Bond Enthalpy

2022-09-09

Bond Enthalpy Definitions When bonds are broken or made enthalpy changes take place A chemical bond is a force of attraction between two atoms Breaking the bond requires the input of energy ...

Edexcel A Level Chemistry:复习笔记1.8.4 Hess Cycles

2022-09-09

Constructing Hess Cycles In 1840, the Russian chemist Germain Hess formulated a law which went on to be known as Hess’s Law This went on to form the basis of one of the laws of thermodynamics. The ...

Edexcel A Level Chemistry:复习笔记1.8.3 Calorimetry

2022-09-09

Calculating Energy Transferred, Q Measuring enthalpy changes Calorimetry is the measurement enthalpy changes in chemical reactions A simple calorimeter can be made from a polystyrene drinkin...

Edexcel A Level Chemistry:复习笔记1.8.2 Enthalpy Level Diagrams

2022-09-09

Enthalpy Level Diagrams The total chemical energy inside a substance is called the enthalpy (or heat content) When chemical reactions take place, changes in chemical energy take place and th...

Edexcel A Level Chemistry:复习笔记1.8.1 Enthalpy Changes

2022-09-09

Enthalpy Change Definitions To be able to compare the changes in enthalpy between reactions, all thermodynamic measurements are carried out under standard conditions These standard condition...