Higher Chemistry Redox – Reduction and Oxidation

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Presentation transcript:

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

Starter Questions S3 Revision

Starter Questions S3 Revision

Starter Questions S3 Revision

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.

OilRig! p31

Ion-Electron Equations p31

Oxidising agents p32

Reducing agents p32

ConsolidationTask Identify the oxidising and reducing agents in the examples your teacher will give you. S3 Revision

Starter Questions

Starter Questions

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.

Balancing Redox Equations p33

Balancing Redox Equations p33

Balancing Redox Equations p33

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-  2Cr3+ + 7H2O

Balancing Redox Equations Step 3: Balance the hydrogen in the water by adding hydrogen ions. Cr2O72- + 14H+  2Cr3+ + 7H2O Step 4: Calculate the total electrical charge on each side of the equation. (12+) (6+) Step 5: Add electrons to balance the electrical charges. Cr2O72- + 14H+ + 6e-  2Cr3+ + 7H2O (12+) + (6-) (6+)

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

Starter Question

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..

Redox Reactions p34

Redox Reactions

Redox Reactions p34

Redox Reactions

Starter Questions

StarterTask P35 Complete QuickTest 11. You have 4 minutes! S3 Revision

Quick Test Answers 1. A 2. B 3. B 4. B S3 Revision

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.

Displacement Reactions

Displacement Reactions

Displacement Reactions

Displacement Reactions Reaction Mixture Prediction Result

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

Starter Questions S3 Revision

Starter Questions S3 Revision

Starter Questions S3 Revision

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.

Redox Titration. p37

Redox Titration. p37 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.

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

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 ?