Redox Equilibrium

Activity 1D: Determine the oxidation number for the underlined elements. Show all workings, if any. Answer:1. +7   2. +2   3. -14. +15. +16. +37. +48. 0

Activity 1C:Carry out this activity in groups.Table 1.3 shows the chemical equations for two examples of redox reactions.(a) Discuss why the reactions in Table 1.3 can be classified as redox reactions.(b) For each reaction, identify the following:(i) Oxidised and reduced substances. (ii) Oxidising and reducing agents. Present the outcome of your group discussion in your class in … Read more

Laboratory Activity 1A – Transfer of Electrons at a Distance:Aim: To investigate oxidation and reduction reactions in terms of electron transfer at a distance.Materials: 1.0 mol dm−3 of sulphuric acid, H2SO4, 0.2 mol dm−3 of iron(II) sulphate, FeSO4 solution (freshly prepared), 0.1 mol dm−3 of acidified potassium manganate(VII), KMnO4 solution and 0.5 mol dm−3 of … Read more

Activity 1B:Carry out this activity in pairs. The following reaction is a redox reaction:2NH3(g) + 3CuO(s) → N2(g) + 3Cu(s) + 3H2O(l)(a) Identify:(i) Oxidised substance. (ii) Reduced substance. (iii) Oxidising agent. (iv) Reducing agent.(b) Explain your answers to your classmates. Answer:(a)(i) Ammonia(ii) Copper(II) oxide(iii) Copper(II) oxide(iv) Ammonia(b) – Ammonia is oxidised because it loses hydrogen– … Read more

Application of The Reactivity Series of Metals in The Extraction of Metals The method that is used in the extraction of metal from its ore depends on the position of the metal in the reactivity series of metals. metals that are located lower than carbon in the reactivity series of metals can be extracted using … Read more

Position of Hydrogen in The Reactivity Series of Metals The position of hydrogen in the reactivity series of metal can also be determined based on its ability to displace oxygen from metal oxides. If hydrogen is more reactive than a metal, it can displace oxygen from metal oxide, and reduces the metal oxide to its … Read more

Position of Carbon in The Series of Reactivity of Metals The position of carbon in the series of reactivity of metals can be determined based on: the ability of metals to take away oxygen from carbon oxide, that is carbon dioxide. the ability of carbon to take away oxygen from metal oxides Experiment 1 If … Read more

When a metal reacts with oxygen to form a metal oxide, a redox reaction occurs.Metal + Oxygen → Metal oxide In this reaction, Metal is oxidised to metal ions. The oxidation number of the metal increases. Oxygen is reduced to the oxide ion. The oxidation number of oxygen decreases from 0 to -2. Metal acts … Read more

Controlling Rusting Steps to Control Rusting The use of a metal which is less electropositive The plating of iron with a thin layer of a metal which is less electropositive such as tin, silver or copper will prevent the iron underneath it to react with water and air, and so prevents the iron from rusting. … Read more