Redox

Learning Guide #1: This video clip is a short intorduction to Redox - mentioned in your REDOX learning guide #1. It explains how redox is a reaction involving a transfer of electrons. Oxidation = a loss of electrons, Reduction = gain of electrons.

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//__Learning Guide #2:__// Learning Guide #2 starts introducing you to oxidation numbers and their role in Redox. We can use oxidation numbers to work out whether an element has been oxidised or reduced. This short clip illustrates the trends of oxidation states (or numbers) in the periodic table:

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[|Periodicity] This site goes over oxidation numbers and their link to the patterns of the periodic table, as well as gives further opportunity to calculate oxidation numbers.

Read through this interactive powerpoint and have a go at the questions in it.

Below are the worksheets highlighted in LG #2. (AKA Oxidation numbers practice on your learning guide)

Learning Guide #3:

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Is this a redox reaction? Why or why not? Are you able to describe the reactions in terms of oxygen, hydrogen or electron transfer? Are you able to write half equations and a balanced overall equation for what is happening? ======

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media type="file" key="chlorine iodide.wmv" width="300" height="300" This video gives an example of a redox reaction between Chlorine and iodide ions. Try answering the associated questions on your learning guide. ======

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Once you've attempted the readings and questions on the learning guide, have a go at the following resource. You need to print it off, cut up the sections and then correctly match them. If you just want to have a quick go at the end of class or in ILC that's fine - I have printed a copy that you may use during school time. Just come and see me for the resource. :-) ======

Learning Guide #5: By now, you should have quite a good base understanding of oxidation, reduction, reductant, oxidant, and oxidation number. This learning guide is focused on consolidating your understanding of concepts covered so far, as well as colour changes that occur with common oxidants and reductants.



Learning Guide #6

This may well be your last learning guide for this topic, the focus is on electrolytic cells (where electrolysis takes place). Electrolysis literally means electro - lysis, i.e. to split using electricity. A current can be passed through an electrolyte, causing a redox chemical change. An electrolytic solution or a molten electrolyte contains free negative or positive ions, which move freely throughout the solution. When an electrical potential (voltage) is applied across this solution, ions move towards the electrodes: cations (+vely charged ions) move towards the negative terminal called cathode, and anions (-vely charged ions) move towards the positive terminal called anode. On reaching the electrode surfaces, these ions take part in chemical reactions. The cations get reduced at the cathode, while the anions get oxidized at the anode.

The products of these electrode reactions,
 * May get deposited at the electrode surface.
 * May go out in the form of gaseous products.
 * May get dissolved into the solution as ions.

Electrolysis Process
Electrolysis is carried out in a specially designed apparatus called electrolytic cell. An electrolytic cell consists of a container made either of glass, or any suitable plastic material which is a bad conductor of electricity. Two electrodes (rods or plates) are placed in the cell and the electrolytic cell is filled with the solution of the electrolyte or with molten electrolyte. Electric current is passed through the solution by connecting the electrodes to a battery (source of direct current). You should be able to label an electrolytic cell (with flow of charge) as well as define each of the key terms in bold) <span style="display: block; font-family: 'Comic Sans MS',cursive;"> (Image taken from [|www.tutorvista.com/])

<span style="display: block; font-family: 'Comic Sans MS',cursive;">﻿This process is outlined in detail in Chapter 28 of your textbooks. <span style="display: block; font-family: 'Comic Sans MS',cursive;">Industrial Electrolysis: <span style="display: block; font-family: 'Comic Sans MS',cursive;"> Electrolysis Mind map:

Have a go at this Redox practice assessment, it is mainly focused on electrolysis. Have a go without your notes, then go back through it and try and improve your answers in a different coloured pen with your notes :-)
 * Overview:**

Try printing off this **Redox Rummy game** and play with a friend :-) The rules are at the end of the document. Each square is a card, so when printed you will need to cut out the various cards.. Have fun!