O LevelChemistryCambridge (CIE)Exam Questions9. Metals9.3 Alloys & their Properties

Alloys & their Properties (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

3 hours32 questions

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9.3 Alloys & their Properties

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1
1 mark

Which diagram shows an alloy?

q1-9-2-easy-cie-igcse-chemistry

    Choose your answer

    2
    1 mark

    Zinc has many uses in the home. The diagram shows two items that contain zinc.

    q4-9-1-easy-cie-igcse-chemistry

    In which of these items is zinc used as an alloy?

     

    bucket

    door-knocker

    A

    ×

    ✓

    B

    ✓

    ✓

    C

    ×

    ×

    D

    ✓

    ×

      Choose your answer

      3
      1 mark

      Why are alloys harder than the pure metals from which they are made?

      • There are stronger bonds between the atoms

      • The atoms are all the same size 

      • The layers of atoms are distorted

      • The properties of each element have combined

      Choose your answer

      4
      1 mark

      Which statement is correct?

      • Brass is an element.

      • Iron is an alloy.

      • Stainless steel is a mixture.

      • Zinc is a compound.

      Choose your answer

      5
      1 mark

      Brass is an alloy of copper and zinc.

      Which statement about the composition of brass is correct?

      • The composition of brass is fixed.

      • The composition of brass can vary.

      • Brass contains equal masses of copper and zinc.

      • All brass contains more zinc than copper.

      Choose your answer

      1
      1 mark

      The diagram shows the structure of a substance.

      Closely packed circles of two different sizes arranged in uneven rows. Most of the circles are larger and darker, and a few smaller, paler circles sit among them.

      Which substance could the diagram represent?

      • Pure copper

      • Brass

      • Carbon dioxide

      • Sodium chloride

      Choose your answer

      2
      1 mark

      The diagram shows the structure of an alloy.

      q30-cie-o-level-chemistry-specimen-2023-paper-1

      Which statement about alloys is correct?

      • Alloys can only be formed by mixing copper or iron with other metals.

      • Carbon and iron are the only two elements in stainless steel.

      • In an alloy there is attraction between positive ions and a ‘sea’ of delocalized electrons.

      • The alloy brass has a chemical formula.

      Choose your answer

      3
      1 mark

      Which statement explains why alloys are harder and stronger than pure metals?

      • Alloys contain strong covalent bonds between the different atoms.

      • The metallic bonds in an alloy are stronger because there are more delocalised electrons.

      • The atoms in an alloy are packed more closely together than in a pure metal.

      • The different sized atoms in an alloy mean the layers can no longer slide over each other.

      Choose your answer

      4
      1 mark

      Brass is an alloy of two metals.

      Which row describes the correct use of the two metals that brass is made from?

       

      metal 1

      metal 2

      A

      galvanising steel

      making aircraft

      B

      electrical wiring

      galvanising steel

      C

      making aircraft

      making cutlery

      D

      making cooking pans

      electrical wiring

        Choose your answer

        5
        1 mark

        Which row correctly matches an alloy to the property that makes it suitable for its use?

        alloy

        property

        use

        A

        stainless steel

        resistance to rusting

        cutlery

        B

        stainless steel

        low density

        aircraft bodies

        C

        brass

        poor electrical conductivity

        electrical plug pins

        D

        mild steel

        resistance to rusting

        car bodies

          Choose your answer

          1
          1 mark

          Brass is an alloy of two metals

          Which is the correct statement? 

          • The alloy will completely dissolve in dilute hydrochloric acid.

          • Brass is formed by a chemical reaction between two metals 

          • Brass can be represented by a chemical formula

          • One of the metals in the alloy will dissolve in dilute hydrochloric acid

          Choose your answer

          2
          1 mark

          An alloy is made by mixing metal X with a small amount of metal Y.

          The atoms of Y are only slightly different in size from the atoms of X.

          Which statement about this alloy is correct?

          • It is much harder than pure X.

          • It is only slightly harder than pure X.

          • It is softer than pure X.

          • It has the same hardness as pure X.

          Choose your answer

          3
          1 mark

          A pure metal is mixed with a second metal to form an alloy.

          Which statements about the alloy are correct?

          1 The layers of atoms are harder to slide over each other than in the pure metal.

          2 The alloy conducts electricity less well than a non-metal.

          3 The two metals are mixed rather than chemically combined.

          • 1, 2 and 3

          • 1 and 2 only

          • 1 and 3 only

          • 2 only

          Choose your answer

          4
          1 mark

          The table shows the hardness of three samples of metal.

          sample

          composition

          hardness

          1

          100% copper

          low

          2

          70% copper, 30% zinc

          high

          3

          99% copper, 1% zinc

          low

          Which conclusion is supported by the data?

          • Adding any amount of zinc to copper makes it much harder.

          • A greater proportion of zinc gives a greater increase in hardness.

          • Zinc is harder than copper.

          • Copper and zinc react together to form a harder compound.

          Choose your answer

          5
          1 mark

          Solder is an alloy of tin and lead. It melts at a lower temperature than either pure tin or pure lead.

          Solder is used to join electrical components to a circuit board.

          Which statement explains why a low melting point is an advantage for this use?

          • The solder can be melted without damaging the components.

          • The solder conducts electricity better because it has a low melting point.

          • The solder will not melt again once the joint has been made.

          • The low melting point makes the joint stronger.

          Choose your answer