Edexcel A Level Chemistry:复习笔记6.1.8 Fuel Cells
Fuel Cells A fuel cell is an electrochemical cell in which a fuel donates electrons at one electrode and oxygen gains electrons at the other electrode These cells are becoming more common in...
Edexcel A Level Chemistry:复习笔记6.1.7 Storage Cells
Storage Cells Electrochemical cells can be used as a commercial source of electrical energy Cells can be described as primary, secondary or fuel cells Primary cells are non-rechargeable (irr...
Edexcel A Level Chemistry:复习笔记6.1.6 Disproportionation & Electrode Potential
Disproportionation & Electrode Potential A disproportionation reaction is where one element in a chemical is simultaneously reduced and oxidised, e.g. 2Cu+ (aq) → Cu2+ (aq) + Cu (s) Stan...
Edexcel A Level Chemistry:复习笔记6.1.5 Thermodynamics & Electrode Potential
Thermodynamic Feasibility Feasibility The Eꝋ values of a species indicate how easily they can get oxidised or reduced The more positive the value, the easier it is to reduce the species on t...
Edexcel A Level Chemistry:复习笔记6.1.4 Conventional Cell Representation
Conventional Cell Representation Conventional Representation of Cells As it is cumbersome and time-consuming to draw out every electrochemical cell in full, a system of notation is used whic...
Edexcel A Level Chemistry:复习笔记6.1.3 Measuring Standard Electrode Potential
Measuring Standard Electrode Potential There are three different types of half-cells that can be connected to a standard hydrogen electrode to measure standard electrode potential A metal / ...
Edexcel A Level Chemistry:复习笔记6.1.2 Standard Electrode Potential
Standard Electrode Potentials Standard electrode potential The position of equilibrium and therefore the electrode potential depends on factors such as: Temperature Pressure of gases Concent...
Edexcel A Level Chemistry:复习笔记6.1.1 Reduction & Oxidation
Reduction & Oxidation To recap, there are three definitions of oxidation and reduction used in different branches of chemistry Oxidation and reduction can be used to describe any of the...
Edexcel A Level Chemistry:复习笔记5.5.9 Arrhenius & Activation Energy
Arrhenius & Activation Energy 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 remain...
Edexcel A Level Chemistry:复习笔记5.5.8 Rates & Reaction Mechanisms
Deducing Reaction Mechanisms Chemical kinetics can only suggest a reaction mechanism, they cannot prove it However, they can be used to disprove a proposed mechanism Elementary steps ...
Edexcel A Level Chemistry:复习笔记5.5.7 Rate-Determining Steps
Deducing Rate-Determining Steps 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 slo...
Edexcel A Level Chemistry:复习笔记5.5.6 Reaction Order Graphs
Reaction Order Graphs Reaction Order Using Concentration-Time Graphs In a zero-order reaction, the concentration of the reactant is inversely proportional to time This means that the reactan...
