HOME PAGE * KS3 SCIENCES * GCSE BIOLOGY CHEMISTRY PHYSICS * ADVANCED LEVEL CHEMISTRY
Revision notes chemical equilibrium - structure of cell, notation interpreting electrode potential charts Advanced Level Theoretical-Physical Chemistry
AQA Advanced A level Chemistry Edexcel Advanced A level Chemistry OCR Advanced A level Chemistry A OCR Salters Advanced A level Chemistry B
Doc Brown's A Level Chemistry Revision Notes Theoretical–Physical Advanced Level Chemistry – Equilibria – Chemical Equilibrium Revision Notes PART 7.2 7.2 Simple cell notation and construction, electrode potential chart You should know that redox reactions take place in electrochemical cells where electrons are transferred from the reducing agent to the oxidising agent indirectly via an external circuit. How do you write electrochemical cell notation? how do you make a simple cell from two half–cells to make a simple battery? What is an electrode potential chart? How do you work out the voltage produced by a simple cell from the two half–cell electrode potentials involved? Chemical Equilibrium Notes Part 7 Index 7.2 Constructing a simple cell or battery, and electrode potential chart Fig.2 below shows the full explanatory diagram of how a zinc–copper Daniel cell works
The basis of the calculation can be illustrated by way of a simple electrode potential chart like the one shown on the right. The Emf produced by the cell is the difference between the two half–cell potentials. Note the relative reducing/oxidising power potential trends. See also the list of half–cell potentials in 7.4 which constitutes a 'chart' when set out in relative potential order. The most positive (or least negative) half–cell potential has the stronger the oxidising power of the two half–cells in a complete cell/reaction, so it will constitute the reduction change in the overall cell reaction. The more negative (or least positive) half–cell has the stronger reducing power of the two half–cells, so it will constitute the oxidation change in the full cell reaction. The full cell potential is expressed as the difference between the two half–cell potentials ... Eθcell = Eθhalf–cell of positive pole = most +ve or least –ve Eθ for the reduction half–cell reaction
which I've expressed simply in the Daniel Zn–Cu cell above, and subsequent examples below, as Eθcell = Eθ(+ve/red) – Eθ(–ve/ox) e.g. Eθcell = EθCu2+(aq)/Cu(s) – EθZn2+(aq)/Zn(s) so Eθcell = (+0.34V) – (–0.76V) = +1.10V For the effect of changing concentration on the value of the electrode potential see Appendix 1. The Nernst Equation Chemical Equilibrium Notes Part 7 Index |
Doc Brown's Chemistry |
|
|
best gift deals latest video game release, best gift deals best bargains in shop sales latest pop music releases, best sales deals download free music, latest film releases, best gifts for teenagers latest high street fashion in clothes, fashionable trending in clothing, best gift deals best bargains in shop salesgirls buy clothes, spend a lot of money on clothes, best sales deals shoes, sweets and chocolates, magazines and make-up best gifts for teenagers Boys buy food and drink, computer games best gift deals best bargains in trainers shop sales DVDs and CDs, girls and boys spend a lot of money on credit for mobile phones best sales deals best bargains in shop sales buses and trains to transport them going out best gifts for teenagers best bargains in shoes shop sales Girls spend a lot of money on clothes best gift deals color colour preferences in clothes, cool sunglasses best sales deals boys buy expensive thins like best gifts for teenagers designer sports clothes and trainers, teenagers save for holidays, best sales deals clothes, mobile phones, birthday presents and electronic goods, teenage accessories, Favourite style of jeans. best gifts for teenagers A typical girl’s shopping list includes mobile phone credit deals best shoes gift deals fashionable quality cool airpods, air pods, fashionable clothes best sales deals the most popular favourite sneakers best gifts for teenagers fancy shoes, sweets, chocolates, magazines, best trainers gift deals best bargains in shop sales lip moisturizer best bargains in shop sale slots on make-up, well being, teenage decor decorating their room best sales deals teenagers like LED string lantern lights, best gifts for teenagers beauty products for teenagers, denim jackets, scrunchies coolness, fashionable back packs, typical boy’s shopping list includes mobile credit deals, eating out takeaway food and drinks, what teenagers like to buy in clothes best gifts for teenagers computer games, DVDs, CDs, what teenagers talk about best gift deals what teenagers worry about, what teenagers like to do for fun sports best sales deals what cool things do teenagers buy, resale websites like eBay Teenager best high street shop or best online deals currys pc world argos amazon john lewis dell acer samsung raycon bose sony asus huawei HP microsoft in-ear headphones earbuds ipad desktop computer laptop computer for school college university students latest video games consoles apple iphone google high end mobile phones cell phone bargain smartphone xiaomi oppo high tech products latest fashion in trainers latest fashion in shoes latest fashion in mobile phones cell phones |