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Chemistry core quiz (1)

Quiz by Reem Bakr

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39 questions
Show answers
  • Q1
    The diagram shows the paper chromatograms of four substances, W, X, Y and Z. Which two substances are pure?
    Question Image
    X and Z
    W and X
    W and Y
    X and Y
    60s
  • Q2
    A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents. One of these colouring agents is suspected of being illegal. Which method could be used to show the presence of this illegal colouring agent?
    filteration
    distillation
    evaporation
    chromatography
    45s
  • Q3
    A student is investigating a coloured mixture using chromatography. Where should he place the coloured mixture?
    Question Image
    just above the pencil line
    just below the pencil line
    on the pencil line
    in the solvent
    45s
  • Q4
    In the chromatography experiment shown, which label represents the solvent front?
    Question Image
    B
    C
    A
    D
    45s
  • Q5
    A sample of liquid X turns blue cobalt(II) chloride paper pink. The sample boils at 102°C. Which statements are correct? 1) X contains water. 2 ) X is impure water. 3 ) X freezes above 0 °C.
    1, 2 and 3
    1 and 3 only
    2 and 3 only
    1 and 2 only
    45s
  • Q6
    A student carried out paper chromatography on a mixture of amino acids. The student sprayed the dried chromatogram with a locating agent. What is the function of the locating agent?
    to preserve the amino acids
    to dissolve the amino acids
    to form coloured spots with the amino acids
    to stop the amino acids reacting
    45s
  • Q7
    Impurities change the melting and boiling points of substances. Sodium chloride is added to a sample of pure water. How does the addition of sodium chloride affect the melting point and boiling point of the water?
    Melting point decreases and boiling point decreases
    Melting point increases and boiling point increases
    Melting point decreases and boiling point increases
    Melting point increases and boiling point decreases
    60s
  • Q8
    Propanone, is a liquid at room temperature. What is the boiling point of pure propanone?
    56 °C
    51 °C to 61 °C
    –61 °C to –51 °C
    –56 °C
    60s
  • Q9
    A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. He adds magnesium carbonate until no more reacts. Which process should he use for the next stage?
    evaporation
    neutralisation
    filteration
    crystallisation
    45s
  • Q10
    A student separates salt from a mixture of salt and sand. What is the correct order of steps for the student to take?
    filter → shake with water → evaporate
    filter → evaporate → shake with water
    shake with water → evaporate → filter
    shake with water → filter → evaporate
    60s
  • Q11
    Alcohol and water are completely miscible. This means when mixed together they form only one liquid layer. Which method is used to separate alcohol from water?
    crystallisation
    precipitation
    fractional distillation
    filtration
    45s
  • Q12
    The diagram shows how muddy water can be purified. Which process for purifying the muddy water is shown?
    Question Image
    solvent extraction
    filtration
    distillation
    crystallisation
    45s
  • Q13
    Which compound is not used as a fertiliser?
    ammonium sulfate
    potassium nitrate
    calcium carbonate
    ammonium phosphate
    45s
  • Q14
    Lime (calcium oxide) is used to treat waste water from a factory. Which substance is removed by the lime?
    sulphuric acid
    ammonia
    sodium chloride
    sodium hydroxide
    45s
  • Q15
    Iron from a blast furnace is treated with oxygen and with calcium oxide to make steel. Which substances in the iron are removed?
    Question Image
    D
    A
    B
    C
    60s

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