1. Higher Chemistry Redox – Reduction and Oxidation
NEW LEARNING
Writing balanced ion electron equations involving oxygenated group ions.
Balancing redox equations.
Displacement as a redox reaction.
REVISION
OILRIG
Oxidising and Reducing Agents

2. Starter Questions
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3. Starter Questions
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4. Starter Questions
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5. Lesson 1: Oxidation and Reduction
Today we will learn to
Identify oxidising and reducing agents in chemical reactions.
We will do this by
Reviewing oxidation and reduction and trying some examples.
We will have succeeded if
We can apply this knowledge to new examples.

6. OilRig!
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7. Ion-Electron Equations
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8. Oxidising agents
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9. Reducing agents
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10. ConsolidationTask
Identify the oxidising and reducing agents in the examples your teacher will give you.
S3 Revision

11. Starter Questions

12. Starter Questions

13. Lesson 2: Oxidation and Reduction
Today we will learn to
Balance ion electron equations for oxygenated group ions.
We will do this by
Reviewing oxidation and reduction and trying some examples.
We will have succeeded if
We can apply this knowledge to new examples.

14. Balancing Redox Equations
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15. Balancing Redox Equations
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16. Balancing Redox Equations
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17. Balancing Redox Equations
There are some ion-electron equations that are not given in the data book. You must learn the rules to work them out for yourself.
Worked example
Write an ion-electron equation for the following reaction:
Cr2O72-  Cr3+
Step 1: If necessary, balance the central atom / ion.
Cr2O72-  2Cr3+
Step 2: Add water (H2O) if it is needed to balance the oxygen atoms.
Cr2O72-  2Cr H2O

18. Balancing Redox Equations
Step 3: Balance the hydrogen in the water by adding hydrogen ions.
Cr2O H+  2Cr H2O
Step 4: Calculate the total electrical charge on each side of the equation.
(12+) (6+)
Step 5: Add electrons to balance the electrical charges.
Cr2O H e-  2Cr H2O
(12+) (6-) (6+)

19. ConsolidationTask
Complete the examples on page 33. If they are not complete, do them in your study period!
S3 Revision

20. Starter Question

21. Lesson 3: Redox Reactions
Today we will learn to
Put reduction and oxidation reactions together in a balanced REDOX system.
We will do this by
Carrying our some redox reactions and writing balanced reactions for them.
We will have succeeded if
We can explain which species are oxidised and reduced in our reactions..

22. Redox Reactions
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23. Redox Reactions

24. Redox Reactions
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25. Redox Reactions

26. Starter Questions

27. StarterTask
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Complete QuickTest 11. You have 4 minutes!
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28. Quick Test Answers
1. A 2. B 3. B 4. B
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29. Lesson 4: Displacement Reactions
Today we will learn to
Apply our redox knowledge to predict displacement reactions.
We will do this by
Predicting the likelihood of a displacement and experimenting to test our predictions.
We will have succeeded if
We can correctly predict the oxidation and reduction in a potential displacement reaction.

30. Displacement Reactions

31. Displacement Reactions

32. Displacement Reactions

33. Displacement Reactions
Reaction Mixture
Prediction
Result

34. Definition
Choose three new words you have learnt in this topic and write dictionary definitions.

35. Starter Questions
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36. Starter Questions
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37. Starter Questions
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38. Lesson 5: Redox Titration
Today we will learn to
Use redox chemistry to determine the vitamin C content of a substance.
We will do this by
Doing a redox titration on a vit C tablet.
We will have succeeded if
We can explain which part of the reaction is the oxidation, and which the reduction.

39. Redox Titration.
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40. Redox Titration.
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Carry out the titration in pairs, using the instructions given. Results should be recorded on the write up sheet.
After you have 2 concordant results (what does THAT mean?) use the help sheet to calculate the mass of vitamin C in each tablet.
Staple the write up sheet into your notebook.

41. Titration Results Titration Volume iodine at start/cm3
Volume iodine at end/cm3
Titre/cm3 1 2 3 4
Average titre = cm3

42. Explain what you have learnt today and how you have learnt it
Back to Plenaries
What? How?
Explain what you have learnt today and how you have learnt it ?