AQA A Level Chemistry復習筆記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復習筆記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復習筆記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 ...
AQA A Level Chemistry復習筆記5.1.8 Reaction Feasibility
Reaction Feasibility The Gibbs equation can be used to calculate whether a reaction is?feasible?or not ΔG??= ΔHreaction??- TΔSsystem? When ΔG??is?negative, the reaction is?feasible?and likel...
AQA A Level Chemistry復習筆記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復習筆記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復習筆記5.1.5 Enthalpy of Solution & Hydration
Solution & Hydration Enthalpy of solution The?standard enthalpy change of solution (ΔHsol?)?is the enthalpy change when?1 mole?of an ionic substance?dissolves?in sufficient water to form...
AQA A Level Chemistry復習筆記5.1.4 Comparing Lattice Enthalpies
Comparing Lattice Enthalpies How accurate are lattice enthalpies? It is possible to calculate a theoretical value for the lattice enthalpy of an ionic solid. To do this you need to know the?...
AQA A Level Chemistry復習筆記5.1.3 Born-Haber Calculations
Calculations Using Born-Haber Cycles Once a Born-Haber cycle has been constructed, it is possible to calculate the lattice energy (ΔHlatt?) by applying Hess’s law and rearranging: ΔHf??= ΔHa...
