Edexcel A Level Chemistry:复习笔记1.9.4 Catalysts in Industry
Catalysts in Industry Catalysts can be divided into two types: Homogeneous catalysts Heterogeneous catalysts Homogeneous means that the catalyst is in the same phase as the reactants ...
Edexcel A Level Chemistry:复习笔记1.9.3 Maxwell-Boltzmann Distributions
Temperature Effects Maxwell-Boltzmann distribution curve A Maxwell-Boltzmann distribution curve is a graph that shows the distribution of energies at a certain temperature In a sample of a g...
Edexcel A Level Chemistry:复习笔记1.9.2 Calculating Rates of Reaction
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
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
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
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
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
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
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...
