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    Worksheeth - Extraction of Metal

    Uploaded by

    Sindhu Priya
    This document contains questions about the extraction of metals and corrosion. It discusses the process of extracting aluminum from its ore. Aluminum oxide is converted to pure aluminum oxide which then undergoes electrolysis. Electrolysis involves passing an electric current through molten aluminum oxide to reduce it to aluminum metal. Graphite rods act as electrodes and carbon adds to lower the electrolysis temperature. Ions form at the electrodes, with aluminum ions plating at the cathode. The anodes need frequent replacement due to corrosion. Aluminum oxide reacts with both acids and bases, forming aluminum salts.

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    © All Rights Reserved
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    Worksheeth - Extraction of Metal

    Uploaded by

    Sindhu Priya
    37 views4 pages
    This document contains questions about the extraction of metals and corrosion. It discusses the process of extracting aluminum from its ore. Aluminum oxide is converted to pure aluminum oxide which then undergoes electrolysis. Electrolysis involves passing an electric current through molten aluminum oxide to reduce it to aluminum metal. Graphite rods act as electrodes and carbon adds to lower the electrolysis temperature. Ions form at the electrodes, with aluminum ions plating at the cathode. The anodes need frequent replacement due to corrosion. Aluminum oxide reacts with both acids and bases, forming aluminum salts.

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    Worksheeth_extraction of metal

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    This document contains questions about the extraction of metals and corrosion. It discusses the process of extracting aluminum from its ore. Aluminum oxide is converted to pure aluminum oxide which then undergoes electrolysis. Electrolysis involves passing an electric current through molten aluminum oxide to reduce it to aluminum metal. Graphite rods act as electrodes and carbon adds to lower the electrolysis temperature. Ions form at the electrodes, with aluminum ions plating at the cathode. The anodes need frequent replacement due to corrosion. Aluminum oxide reacts with both acids and bases, forming aluminum salts.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    37 views4 pages

    Worksheeth - Extraction of Metal

    Uploaded by

    Sindhu Priya
    This document contains questions about the extraction of metals and corrosion. It discusses the process of extracting aluminum from its ore. Aluminum oxide is converted to pure aluminum oxide which then undergoes electrolysis. Electrolysis involves passing an electric current through molten aluminum oxide to reduce it to aluminum metal. Graphite rods act as electrodes and carbon adds to lower the electrolysis temperature. Ions form at the electrodes, with aluminum ions plating at the cathode. The anodes need frequent replacement due to corrosion. Aluminum oxide reacts with both acids and bases, forming aluminum salts.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 4

    NAME : ______________________________________ CLASS : ___________________ SEC : _______

    DATE OF ISSUE: _________________ DATE OF SUBMISSION : ________________

    TOPIC: EXTRACTION OF METALS AND CORROSION


    (1)

    (b)

    Page 1 of 4
    (3)

    Complete the following using the words below

    Anode cathode electrolyte ions solution

    In electroplating , you make the object to be electroplated the_____________________.

    The _______________is the plating metal. The _______________is an

    aqueous_____________________containing ________________ of the plating material.

    (4) Aluminium is extracted from its ore. The ore is converted into pure aluminium oxide, which then
    undergoes electrolysis as shown.

    Page 2 of 4
    (a) (i) Name an ore of

    aluminium. ....................................................................................................................................... [1]

    (b) (ii) What is meant by the term

    electrolysis? ...........................................................................................................................................

    .. ....................................................................................................................................... [2]

    (c) (b) Aluminium oxide has a melting point of about 2000°C, but the electrolysis process operates at

    about 900°C. (i) Name the compound added to aluminium oxide to reduce the operating

    temperature. .......................................................................................................................................

    [1]

    (d) (ii) Suggest one benefit to the environment of reducing the operating

    temperature. ...........................................................................................................................................

    .. ....................................................................................................................................... [1]

    (e) (iii) Write the ionic half-equation for the reaction taking place at:

    (f) the negative electrode (cathode) ........................................................................................

    (g) the positive electrode (anode) ............................................................................................ [4]

    (h) (iv) Explain why the anodes need frequent

    replacement. ..........................................................................................................................................

    ... ........................................................................................................................................ [2]

    (i) Aluminium oxide reacts with acids and with alkalis.

    Page 3 of 4
    (j) (i) What term is used to describe an oxide that reacts with acids and with

    alkalis? ....................................................................................................................................... [1]

    (k) (ii) Aluminium oxide reacts with dilute sulfuric acid to form a salt. State the name and write the

    formula of the salt formed.

    name...................................................................................................................................

    formula ................................................................................................................................ [2]

    (l) (iii) Aluminium oxide reacts with dilute sodium hydroxide to form a salt and one other product.

    Name the other

    product. ....................................................................................................................................... [1]

    (m) (iv) Aluminium hydroxide, Al(OH)3, decomposes when heated to form aluminium oxide and water.

    Write the chemical equation for this

    reaction. ....................................................................................................................................... [2]

    (n) (v) Suggest the names of two other aluminium compounds that decompose when heated to form

    aluminium

    oxide. ............................................................................................................................................. .......

    ................................................................................................................................ [2]

    Page 4 of 4

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