Chemical Tests (Edexcel IGCSE Chemistry)

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  • Give the test and result for hydrogen gas.

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Cards in this collection (36)

  • Give the test and result for hydrogen gas.

    The test and result for hydrogen gas is a lit / burning splint makes a 'squeaky pop' sound.

  • Give the test and result for oxygen gas.

    The test and result for oxygen gas is a glowing splint relights.

  • Give the test and result for carbon dioxide gas.

    The test and result for carbon dioxide gas is limewater turns cloudy / milky.

  • Give the test and result for chlorine gas.

    The test and result for chlorine gas is that damp litmus paper turns red and then bleaches white.

  • Give the test and result for ammonia gas.

    The test and result for ammonia gas is using damp red litmus paper which will turn blue.

  • True or False?

    Chlorine is a colourless, pungent gas.

    False.

    Chlorine is a green pungent gas

  • What is a flame test used for?

    A flame test is used to identify metal ions by the colour of the flame they produce when heated.

  • True or False?

    The Bunsen burner flame should be on a blue flame for flame tests.

    True.

    The Bunsen burner flame should be on a blue flame for flame tests as this is the hottest flame.

  • Give the flame colour produced by sodium ions.

    The flame colour produced by sodium ions is yellow.

  • Give the flame colour produced by copper(II) ions.

    The flame colour produced by copper ions is blue -green.

  • True or False?

    The flame colour produced by potassium ions is pink.

    False.

    The flame colour produced by potassium ions is lilac.

  • Give the flame colour produced by calcium ions.

    The flame colour produced by calcium ions is orange-red.

  • True or False?

    The flame colour produced by lithium ions is red.

    True.

    The flame colour produced by lithium ions is red.

  • Why is the nichrome wire first dipped in hydrochloric acid?

    The nichrome wire is first dipped in hydrochloric acid to avoid contamination.

  • Define the term cation.

    A cation is a positively charged ion.

  • What is the formula of an ammonium ion?

    The formula of an ammonium ion is NH4+.

  • What colour precipitate is formed when sodium hydroxide is added to a solution containing copper(II) ions?

    The colour of the precipitate formed when sodium hydroxide is added to a solution containing copper(II) ions is blue.

  • True or False?

    Iron(III) ions form a green precipitate in the presence of sodium hydroxide.

    False.

    Iron(III) ions form a brown precipitate in the presence of sodium hydroxide.

  • Describe a test for ammonium ions.

    The test for ammonium ions is:

    • Add sodium hydroxide solution

    • If ammonium ions are present, ammonia gas is produced which turns damp red litmus paper blue.

  • What colour precipitate is formed when sodium hydroxide is added to a solution containing iron(II) ions??

    The colour of the precipitate formed by iron(II) ions in the presence of sodium hydroxide is green.

  • Define the term anion.

    An anion is a negatively charged ion.

  • Describe the test and result for bromide ions.

    The test and result for bromide ions is:

    • Add dilute nitric acid followed by silver nitrate solution

    • A cream precipitate is formed

  • What is the formula of a carbonate ion?

    The formula of a carbonate ion is CO32-.

  • Describe the test and result for carbonate ions.

    The test for carbonate ions is:

    • Add dilute hydrochloic acid and test the gas produced by bubbling it through limewater.

    • If carbonate ions are present, carbon dioxide is produced which turns limewater cloudy.

  • Describe the test and result for iodide ions.

    The test and result for iodide ions is:

    • Add dilute nitric acid followed by silver nitrate solution

    • A yellow precipitate is formed

  • True or False?

    Chloride ions give a white precipitate with acidified silver nitrate solution.

    True.

    Chloride ions give a white precipitate with silver nitrate solution.

  • True or False?

    To test for sulfate ions, acidified berylium chloride is used.

    False.

    To test for sulfate ions, barium chloride is used

  • Name the white precipitate formed during a positive test for sulfate ions.

    The white precipitate formed during a positive test for sulfate ions is barium sulfate.

  • When acidified silver nitrate solution is added to a sample containing bromide ions, a precipitate of silver bromide is formed.

    What is the state symbol for this precipitate?

    The state symbol for the precipitate of silver bromide is s.

  • Describe the chemical test for water.

    The chemical test for water is anhydrous copper(II) sulfate turning from white to blue on the addition of water.

  • Define the term pure substance.

    A pure substance consists of a single element or compound.

  • Describe the physical test used to determine whether a sample of water is pure.

    The physical test to determine whether a sample of water is pure is to check its boiling point which should be exactly 100 oC.

  • What colour does anhydrous copper(II) sulfate turn in the presence of water?

    Anhydrous copper(II) sulfate turns blue in the presence of water.

  • True or False?

    Impurities tend to raise the boiling point of water.

    True.

    Impurities tend to raise the boiling point of water.

  • Name the piece of apparatus used to check the boiling point of water.

    The piece of apparatus used to check the boiling point of water is a thermometer.

  • True or False?

    Impurities tend to raise the melting point of water.

    False.

    Impurities tend to lower the melting point of water.