8303143-050-Redox-Applications

8303143-050-Redox-Applications - Chem Factsheet April 2003...

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Redox Equilibria III - Applications C hem F actsheet April 2003 Number 50 1 Before working through this Factsheet you should ensure you understand the redox equilibria covered so far at AS and A2 in Factsheets: No. 9 (Equilibrium) – use of the ¾ sign. No. 37 (Redox Equilibria (I)) - cells and standard electrode potentials ( E ê ) No. 45 (Redox Equilibria (II) – using E ê values to predict if reactions will take place. After working through this Factsheet you will: have met the concept of ‘corrosion/rusting’ and be able to explain the processes involved using the E ê values and equilibrium processes have met the concept of ‘storage cells’ and seen it applied to the lead acid battery (accumulator) as the specific example. Exam Hint:- In this area of the A2 specification you need to learn the basic facts and equations so you can answer questions on the topic. There is no shortcut to learning thoroughly the information given! The topics are in most other A2 textbooks – which you could (and should) use in conjunction with the Factsheet to help you gain a full understanding of the work. The presentation of these topics is designed to be a logical progression from the other Factsheets already mentioned. 1. Corrosion/rusting - its causes and prevention Definitions Corrosion is when a metal is converted into its ions (forming a compound). e.g. M(s) M 2+ (aq) + 2e This process is OXIDATION (oxidation state change from O + 2 When iron undergoes this change it is called RUSTING. Corrosion/rusting is an
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This note was uploaded on 03/08/2011 for the course CHEM 101 taught by Professor Hard during the Spring '11 term at UT Arlington.

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8303143-050-Redox-Applications - Chem Factsheet April 2003...

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