AQA A Level Chemistry复习笔记5.2.8 Rate Determining Step
Rate Determining Step Rate-determining step & intermediates A chemical reaction can only go as fast as the slowest part of the reaction So, the rate-determining step is the slowest step ...
AQA A Level Chemistry复习笔记5.2.7 Rate-Concentration Graphs
Rate-Concentration Graphs Order of reaction from initial rate The progress of the reaction can be followed by measuring the initial rates of the reaction using various initial concentrations...
AQA A Level Chemistry复习笔记5.2.6 Concentration-Time Graphs
Concentration-Time Graphs Order of reaction from concentration-time graphs In a zero-order the concentration of the reactant is inversely proportional to time This means that the concentrati...
AQA A Level Chemistry复习笔记5.2.5 Finding Activation Energy
Finding Activation Energy Finding the Activation Energy Very often, the Arrhenius Equation is used to calculate the activation energy of a reaction Either a question will give sufficient inf...
AQA A Level Chemistry复习笔记5.2.4 The Arrhenius Equation
The Arrhenius Equation The rate equation shows how each of the reactants in a reaction effects the rate of the reaction and it includes the rate constant, k However, k only remains constant ...
AQA A Level Chemistry复习笔记5.2.3 Rate Equation Calculations
Rate Equation Calculations The rate constant (k) of a reaction can be calculated using the initial rates and the rate equation Calculating the rate constant from the initial rate The reactio...
AQA A Level Chemistry复习笔记5.2.2 Deriving Rate Equations
Deducing Orders Order of reaction For the general reaction A + B → C + D The order of reaction shows how the concentration of a reactant affects the rate of reaction Rate = k [A]m [B]n When ...
2022年夏季A-Level&GCSE成绩公布时间已确认！三大考试局秋季考试具体安排公布
2022年夏季大考，CAIE、爱德思、牛津AQA成绩何时放榜？ CAIE考试局 2022年8月11日：AS&A Level成绩公布 2022年8月17日：Pre-U成绩公布 2022年8月18日：IGCSE和O Level成绩公布 爱德思考试局 2022.8.18：IAS&a...
AQA A Level Chemistry复习笔记5.1.8 Reaction Feasibility
Reaction Feasibility The Gibbs equation can be used to calculate whether a reaction is feasible or not ΔGꝋ = ΔHreactionꝋ - TΔSsystemꝋ When ΔGꝋ is negative, the reaction is feasible and likel...
AQA A Level Chemistry复习笔记5.1.7 Gibbs Free Energy
Gibbs Free Energy Gibbs free energy As we have seen in the previous sections, the feasibility of a reaction is determined by two factors, the enthalpy change and the entropy change The two f...
AQA A Level Chemistry复习笔记5.1.6 Entropy
Entropy You may have wondered why it is that endothermic reactions occur at all, after all, what can be the driving force behind endothermic reactions if the products end up in a less stable...
AQA A Level Chemistry复习笔记5.1.5 Enthalpy of Solution & Hydration
Solution & Hydration Enthalpy of solution The standard enthalpy change of solution (ΔHsolꝋ) is the enthalpy change when 1 mole of an ionic substance dissolves in sufficient water to form...
