Revision on redox ==july=2011=part 1

Part 1 seminar camp science= chemistry

Seminar part 1) SPM 2009 9 (a) Diagram 9 shows the apparatus and observations for a redox reaction between iron(III) chloride solution and a metal. At the beginning of the experiment After 30 minutes Diagram 9

Based on the observations shown in Diagram 9, suggest a suitable metal to be used in this experiment. Zinc/ magnesium

Based on the observations shown in Diagram 9, Predict the ion present in the green solution iron (II) ion

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The type of reaction that has occurred to each reactant ,[object Object],[object Object],[object Object],[object Object],Iron(III) chloride

The role of each reactant in the redox reaction ,[object Object],[object Object],[object Object],[object Object],Iron(III) chloride

Half -equations involved in redox reaction ,[object Object],[object Object],[object Object],[object Object],Iron(III) chloride

(b) i odide ions are good reducing agent. You are given the following apparatus: U-tube, galvanometer, connecting wires, stopper, dropper, carbon electrodes and retort stand with clamps. Suggest a suitable chemical and describe an experiment to verify the above statement using the given apparatus.

Chemicals 1. Oxidising agent such as Acidified KMnO 4 // Acidified K 2 Cr 2 O 7 // Bromine water// chlorine water // iron (III) chloride solution 2. Sulphuric acid as electrolyte 3. Potassium iodide solution

Procedure 1. Pour sulphuric acid into U tube untill it reach about 5 cm from the mouth of the U-tube 2. Add potassium iodide solution in one arm of the U tube

3. Add acidified KMnO 4 / or any oxidising agent into the other arm 4.The solutions are added slowly so that they do not mix 5. Dip the graphite electrodes into the two separate solutions and connect it to the galvanometer

After 10 minutes, The colour of KMnO 4 changes from purple to colourless MnO 4 - ion is reduced to Mn 2+ ion

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Part 1)SPM 2008 9 (a) A metal M reacts with oxygen to form an oxide. The oxide is very soluble in water to produce an alkaline solution. Suggest the identity of metal M and describe an observation when the metal you have named reacts with oxygen, write the half-equations for oxidation and reduction for the reaction. [4 marks]

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(b) Diagram 9 shows an apparatus set-up to investigate the effect of two different metals, X and Y on the rusting of iron, Fe.

The result of this experiment after three days is shown in Table 9. Pair of metals Observation Fe, X Dark blue colour Fe, Y No change

Based on Table 9, suggest the identity of metals, X and Y. Give two reasons for each of your choices [6 marks] ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Based on Table 9, suggest the identity of metals, X and Y. Give two reasons for each of your choices [6 marks] ,[object Object],[object Object],[object Object],[object Object]

CHANGING OF Fe 2+ TO Fe 3+ ,[object Object],[object Object],[object Object],[object Object]

CHANGING OF Fe 2+ TO Fe 3+ ,[object Object],[object Object]

CHANGING OF Fe 3+ TO Fe 2+ ,[object Object],[object Object],[object Object]

Revision on redox ==july=2011=part 1

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