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Can You Get Through This GCSE Chemistry Test?

Do you know your catalysts from your cations?

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  1. 1. The table below shows the characteristics of three different rocks. Which rock is likely to be sedimentary?

    Pearson / qualifications.pearson.com
    Correct
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    A
    Correct
    Incorrect
    B
    Correct
    Incorrect
    C
    Correct!
    Wrong!

    Sedimentary rocks often contain fossils, have layers, and are easily eroded compared to other types of rock.

    Via en.wikipedia.org
  2. 2. When calcium carbonate is heated a lot, it decomposes to calcium oxide and what gas?

    Correct
    Incorrect
    carbon monoxide
    Correct
    Incorrect
    carbon dioxide
    Correct
    Incorrect
    oxygen
    Correct!
    Wrong!

    Here is the full word equation:

    Via Pearson / qualifications.pearson.com
  3. 3. Complete the sentence: "The Earth’s earliest atmosphere is thought to have been formed by..."

    Correct
    Incorrect
    animals breathing
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    Incorrect
    photosynthesis in plants
    Correct
    Incorrect
    gases from volcanoes
    Correct!
    Wrong!

    This early atmosphere would have been mostly carbon dioxide with very little oxygen.

  4. 4. Complete the sentence: "If a bottle of wine is left open, ethanoic acid is formed when ethanol in the wine is oxidised by..."

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    velvet-girlz.tumblr.com
    Correct
    Incorrect
    "... carbon dioxide."
    Correct
    Incorrect
    "... oxygen."
    Correct
    Incorrect
    "... hydrogen."
    Correct!
    Wrong!

    Oxygen causes oxidisation.

  5. 5. Large alkane molecules can be broken down into smaller ones by heating. What is this process called?

    Correct
    Incorrect
    Combustion
    Correct
    Incorrect
    Polymerisation
    Correct
    Incorrect
    Fractional distillation
    Correct
    Incorrect
    Cracking
    Correct!
    Wrong!

    Cracking produces smaller, more useful hydrocarbon molecules.

  6. 6. Which of these is poly(propene)?

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    Correct
    Incorrect
    Correct
    Incorrect
    Correct
    Incorrect
    Correct!
    Wrong!

    It's made when propene undergoes polymerisation and is also called polypropylene.

  7. 7. Which of these is a cation?

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    Correct
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    Correct
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    Correct
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    Correct!
    Wrong!

    Cations are positively charged.

  8. 8. Which of these sentences correctly explains why an atom has no overall charge?

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    Incorrect
    It contains more protons than electrons.
    Correct
    Incorrect
    It contains the same number of electrons and protons.
    Correct
    Incorrect
    It contains the same number of electrons and neutrons.
    Correct
    Incorrect
    It contains more neutrons than electrons.
    Correct!
    Wrong!

    Protons have +1 relative charge, electrons have -1, so when you have the same number of each they cancel each other out.

  9. 9. Which of these salts is insoluble in water?

    Correct
    Incorrect
    sodium carbonate
    Correct
    Incorrect
    lead chloride
    Correct
    Incorrect
    magnesium nitrate
    Correct!
    Wrong!

    Lead chloride's solubility in water is very low, so it's generally considered to be insoluble.

  10. 10. Which row of the table below shows the boiling point and ability to conduct electricity of a simple molecular, covalent liquid?

    Pearson / qualifications.pearson.com
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    A
    Correct
    Incorrect
    B
    Correct
    Incorrect
    C
    Correct
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    D
    Correct!
    Wrong!

    Simple molecular substances have low boiling and melting points, and don't conduct electricity.

  11. 11. What does a catalyst do?

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    It speeds up the rate of a reaction, but is not used up itself.
    Correct
    Incorrect
    It speeds up the rate of the reaction and is chemically changed during the process.
    Correct!
    Wrong!

    A catalyst doesn't undergo a permanent chemical change during the reaction.

  12. 12. Which of these is a use for vinegar?

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    Incorrect
    Fuel
    Correct
    Incorrect
    Perfume
    Correct
    Incorrect
    Preservative
    Correct
    Incorrect
    Soap
    Correct!
    Wrong!

    The acid in vinegar slows food spoilage.

    Via Thinkstock
  13. 13. If you got a yellow flame in a flame test, which metal ion is likely to be present in your sample?

    en.wikipedia.org
    Correct
    Incorrect
    Calcium, Ca²⁺
    Correct
    Incorrect
    Lithium, Li⁺
    Correct
    Incorrect
    Sodium, Na⁺
    Correct!
    Wrong!

    Sodium produces a bright yellow flame in a flame test.

  14. 14. Which of these options are typical conditions for the Haber process?

    Correct
    Incorrect
    temperature = 200ºC, pressure = 200 atmospheres
    Correct
    Incorrect
    temperature = 450ºC, pressure = 200 atmospheres
    Correct
    Incorrect
    temperature = 450ºC, pressure = 450 atmospheres
    Correct!
    Wrong!

    The Haber process involves combining nitrogen and hydrogen at high temperature and pressure.

  15. 15. What catalyst is used in the Haber process?

    Correct!
    Wrong!

    An iron catalyst is used to speed up the Haber process.

Kelly Oakes is science editor for BuzzFeed and is based in London.

Contact Kelly Oakes at kelly.oakes@buzzfeed.com.

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