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How metals are extracted from their ores

10th grade (Year 11 in England) · 16 questions · Common Core: NGSS.HS-ESS3-2, NGSS.HS-PS1-2 · England: GCSE Combined Science: Chemical changes (extraction of metals), GCSE Chemistry: Using resources

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  1. Question 1

    Extracting metals: which statement is NOT true?

    • A. Life cycle assessments compare the environmental impact of products.
    • B. Carbon can reduce zinc oxide to zinc.
    • C. Reduction always means adding oxygen.
    • D. An ore is a rock containing enough metal to make extraction worthwhile.

  2. Question 2

    Why is recycling aluminium cans so worthwhile?

    • A. It uses about 5 % of the energy needed to extract new aluminium
    • B. Recycling makes aluminium heavier
    • C. Aluminium cannot be extracted from ore
    • D. New aluminium is radioactive

  3. Question 3

    How is potassium usually obtained?

    • A. electrolysis
    • B. reduction with carbon
    • C. found as the native metal

  4. Question 4

    Extracting metals: which statement is NOT true?

    • A. An ore is a rock containing enough metal to make extraction worthwhile.
    • B. Aluminium can be extracted by heating its oxide with carbon.
    • C. Gold is found uncombined because it is very unreactive.
    • D. Life cycle assessments compare the environmental impact of products.

  5. Question 5

    Why is recycling aluminium cans so worthwhile?

    • A. Recycling makes aluminium heavier
    • B. New aluminium is radioactive
    • C. It uses about 5 % of the energy needed to extract new aluminium
    • D. Aluminium cannot be extracted from ore

  6. Question 6

    How is potassium usually obtained?

    • A. electrolysis
    • B. reduction with carbon
    • C. found as the native metal

  7. Question 7

    Extracting metals: which statement is NOT true?

    • A. Gold is found uncombined because it is very unreactive.
    • B. An ore is a rock containing enough metal to make extraction worthwhile.
    • C. Reduction always means adding oxygen.
    • D. Life cycle assessments compare the environmental impact of products.

  8. Question 8

    Why is recycling aluminium cans so worthwhile?

    • A. New aluminium is radioactive
    • B. It uses about 5 % of the energy needed to extract new aluminium
    • C. Aluminium cannot be extracted from ore
    • D. Recycling makes aluminium heavier

  9. Question 9

    How is potassium usually obtained?

    • A. electrolysis
    • B. reduction with carbon
    • C. found as the native metal

  10. Question 10

    Extracting metals: which statement is NOT true?

    • A. Reduction always means adding oxygen.
    • B. An ore is a rock containing enough metal to make extraction worthwhile.
    • C. Gold is found uncombined because it is very unreactive.
    • D. Life cycle assessments compare the environmental impact of products.

  11. Question 11

    In a blast furnace, iron oxide is heated with carbon (coke). What happens to the iron oxide?

    • A. It is reduced: oxygen is removed
    • B. It melts and stays as iron oxide
    • C. It turns into carbon
    • D. It is oxidised: oxygen is added

  12. Question 12

    How is aluminium usually obtained?

    • A. electrolysis
    • B. reduction with carbon
    • C. found as the native metal

  13. Question 13

    Extracting metals: which statement is NOT true?

    • A. Metal ores will never run out.
    • B. An ore is a rock containing enough metal to make extraction worthwhile.
    • C. Life cycle assessments compare the environmental impact of products.
    • D. Gold is found uncombined because it is very unreactive.

  14. Question 14

    Bioleaching uses bacteria to extract copper. What is a drawback?

    • A. It is slow and can produce toxic leachate
    • B. It only works on gold
    • C. It needs huge amounts of electricity
    • D. It releases large amounts of carbon monoxide

  15. Question 15

    How is magnesium usually obtained?

    • A. electrolysis
    • B. reduction with carbon
    • C. found as the native metal

  16. Question 16

    Extracting metals: which statement is NOT true?

    • A. Metal ores will never run out.
    • B. Carbon can reduce zinc oxide to zinc.
    • C. Life cycle assessments compare the environmental impact of products.
    • D. An ore is a rock containing enough metal to make extraction worthwhile.

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Answer key: How metals are extracted from their ores

  1. 1. C. Reduction always means adding oxygen.

  2. 2. A. It uses about 5 % of the energy needed to extract new aluminium

  3. 3. A. electrolysis

  4. 4. B. Aluminium can be extracted by heating its oxide with carbon.

  5. 5. C. It uses about 5 % of the energy needed to extract new aluminium

  6. 6. A. electrolysis

  7. 7. C. Reduction always means adding oxygen.

  8. 8. B. It uses about 5 % of the energy needed to extract new aluminium

  9. 9. A. electrolysis

  10. 10. A. Reduction always means adding oxygen.

  11. 11. A. It is reduced: oxygen is removed

  12. 12. A. electrolysis

  13. 13. A. Metal ores will never run out.

  14. 14. A. It is slow and can produce toxic leachate

  15. 15. A. electrolysis

  16. 16. A. Metal ores will never run out.