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IGCSE CAMBRIDGE EXTRACTION OF METALS TOPICAL QUESTIONS

1.         Aluminium is the most abundant metal in the earth crust and it is widely extracted for

            its wide range of uses.

            (i) Name one major ore of alluminium and give its formula   [1]

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            (ii) Name one main impurity found in the ore            [1]                                                        ………………………………………………………………………………………………………………………………………………………………………

            (iii)Aluminium oxide is heated first before it is electrolysed. Explain why   [2]

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            (iv) Electrolysis of aluminium oxide is done as shown below:

  (a) Identify the anode and cathode on the diagram [2]

   (b) In electrolysis of Aluminium the anodes must be replaced after some time. Explain why [2]

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(c) Write half equations for the reactions that occur at the anode and cathode   (4)

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            (d) State two uses of aluminium and the property that makes them suited for the same [2]

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       (ii) The melting point of aluminium oxide is 2054oC but the electrolysis is carried out at between  780oC  and 900oC

            I. Why is not carried out at 2050oC    [1]

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         II. What is done to lower the temperature         [2]

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2. a. Name the main ore for iron [1]

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    b. State any 3 raw materials for extraction of iron [3]

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    c. write the equation for removal of silicon oxide as slug. [1]

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   d. write the 3 main chemical equations that happen in the blast furnace [6]

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3. state any 3 characteristics of transition metals that are different from other metals. [3]

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4. discuss the reactivity trend down the group of   

1. alkali metals  [2]

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2. halogens [1] ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

3. Noble gases [2] ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

5. Copper ii sulphate is a salt that is prepared in the laboratory  using dilute sulphuric acid. Design an experiment to describe how the salt is prepared.

Give a reason to each step. [6]

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6. In preparation of sodium chloride salt, the student did two procedure. In the first procedure, they used phenolphthalein while in the second they did not. Explain the reason as to why they did that.  [3]

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7. Zinc is a metal that is found in earths crust. And is extracted by reduction.

1. Name the ore of zinc and give its chemical formula [2]

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2. Write down two chemical formulas for the extraction of zinc by reduction. [2]

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8. During manufacture of steel the molten iron is passed into a basic oxygen convertor and then other elements are added.

1. Describe the role of the basic oxygen convertor and how it is done. [4]

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2. Name the materials added to molten iron to form the following alloys.

1. Mild steel…………………………………..[1]

2. Stainless steel ……………………………………………………….[2]

3. Give a reason as to why carbon is the most preferred element in reduction of metals [1]

9. When magenesium and copper oxide are heated together, a redox reaction occurs.

Mg + CuO                                           MgO + Cu

1. What does the term redox mean [1]

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2. For the above reaction name the

a. Reducing agent [1]

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b. Oxidising agent [1]

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3. Describe the electron transfer in the reaction [2]

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4. Explain as fully as you can why the reverse reaction can not occur. [3]

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5. Name any other 3 metals that can remove oxygen from Mg. [3]

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6. Does this metal gain or lose electron more easily than Mg? explain[2]

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7. write an equation between Magnesium and one metal named above to show how the reaction occurs.[the equation must be balanced. [2]

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