Properties of Materials (OCR Gateway GCSE Chemistry: Combined Science)

Exam Questions

2 hours30 questions
11 mark

Graphite is a form of carbon. Graphite can conduct electricity.

Why can graphite conduct electricity?

  • Delocalised electrons are between layers.

  • The ions can move.

  • Layers have weak intermolecular forces.

  • Strong covalent bonds are between the carbon atoms.

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11 mark

Why can graphite conduct electricity?

  • Graphite has delocalised electrons 

  • Graphite has layers of atoms that can slide over each other

  • Graphite has a giant structure

  • Graphite has strong covalent bonds 

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21 mark

Which statement about diamond is correct?

  • It is a hard substance with a low melting point 

  • Each carbon atom is bonded to three others with strong covalent bonds 

  • It has a giant structure and conducts electricity 

  • It has a high melting point with each carbon bonded to four others

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31 mark

Fullerenes are molecules made of carbon.

Fullerenes are increasingly used as catalysts due to their large surface area.

Give one other use of fullerenes. 

  • Alloys

  • Lubricants 

  • Polymers 

  • Fuel Cells 

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41 mark

The diagram shows the structure of a carbon nanotube. 

2-3_q4-ocr-gcse-chemistry-mcq

Which of the following is not a property of carbon nanotubes?

  • High tensile strength

  • High melting point

  • Poor conductor of electricity

  • Strong covalent bonds

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51 mark

Nanoparticles are used in medicine, and can be used to deliver drugs to the cells where they are needed.

Some people are concerned about using nanoparticles this way.

What is the main reason for this concern? 

  • The potential cost of this technology to the National Health Service

  • Limited information to patients on which treatments nanoparticles are used for

  • The unknown effect of nanoparticles on long term health

  • Money could be spent on other areas of medicine that affect a greater proportion of the population

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61 mark

Different substances have characteristic melting and boiling points, depending on the strength of the bonds or forces holding them together.

Which explains why methane has a lower melting point than sodium chloride?

  • Covalent bonds are weaker than ionic bonds

  • Intermolecular forces are weaker than ionic bonds

  • Covalent bonds are stronger than ionic bonds

  • Intermolecular forces are stronger than ionic bonds

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71 mark

Sodium chloride is often known as 'table salt'. 

Which compound represents sodium chloride?

  Conducts electricity when solid Conducts electricity when molten State at room temperature and pressure Can be bent or shaped
A Yes Yes Solid Yes
B No No Solid No
C No Yes Solid No
D No No Solid Yes

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    1 mark

    Look at the table of fractions from the fractional distillation of crude oil.

    Fraction Boiling range (°C)
    LPG less than 25
    petrol 85 – 105
    diesel 150 – 290
    fuel oil 290 – 380
    bitumen  greater than 400

    A hydrocarbon has a boiling point which is 3.5 times the boiling point of petrol. Which fraction contains the hydrocarbon?

    • Bitumen

    • Diesel

    • Fuel oil

    • LPG

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    91 mark

    Substance Y melts at −7 °C and boils at 59 °C.

    What is the state of substance Y at room temperature?

    • Gas

    • Liquid

    • Plasma

    • Solid

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    101 mark

    Ethanol is a liquid at room temperature. It has a low melting point and boiling point.

    Why?

    • Ethanol is an ionic compound.

    • The forces of attraction between ethanol molecules are strong.

    • The forces of attraction between ethanol molecules are weak.

    • There are no forces of attraction between ethanol molecules.

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    111 mark

    Ammonia has a simple molecular structure.

    Which statement explains why ammonia has a low melting point and a low boiling point?

    • The covalent bonds between the atoms are strong.

    • The covalent bonds between the atoms are weak.

    • The intermolecular forces between the molecules are strong.

    • The intermolecular forces between the molecules are weak.

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    121 mark

    A student tests the conductivity of an ionic compound.

    Which row in the table shows the correct results?

      Solid ionic compound Ionic compound dissolved in water Molten ionic compound
    A Conducts Conducts Does not conduct
    B Conducts Conducts Conducts
    C Does not conduct Does not conduct Conducts
    D Does not conduct Conducts Conducts

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      131 mark

      Carbon can form different allotropes.

      Which of these are allotropes of carbon?

      • Diamond, graphite, graphene.

      • Diamond, granite, graphite.

      • Fullerene, graphene, ethene.

      • Granite, graphite, graphene.

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      141 mark

      The atomic radius of a helium atom is 0.031 nm.

      What is the atomic radius of a helium atom in standard form?

      • 3.1 × 10-1

      • 3.1 × 10-2

      • 3.1 × 10-3

      • 3.1 × 10-4

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      151 mark

      Crude oil can be separated in the laboratory into fractions which have different boiling points.

      Look at the table. It shows possible relationships between:

      • boiling point
      • number of carbon atoms in the molecule
      • size of intermolecular forces.

      Which letter shows the correct relationship?

        Boiling point Number of carbon atoms in the molecule Size of intermolecular forces
      A high less than 20 large
      B high more than 50 small
      C low less than 20 small
      D low more than 50 large

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        161 mark

        The melting point of bromine is −7°C.

        The boiling point of bromine is 59°C.

        What state would bromine be at room temperature?

        • Aqueous

        • Gas

        • Liquid

        • Solid

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        171 mark

        Carbon dioxide exists as a simple molecule.

        Why do simple molecules have low boiling points?

        • Simple molecules have weak covalent bonds between atoms.

        • Simple molecules have weak intermolecular forces between atoms.

        • Simple molecules have weak ionic bonds between the molecules.

        • Simple molecules have weak intermolecular forces between the molecules.

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