GCSEChemistryOCR GatewayExam Questions2. Elements, compounds & mixtures2.3 Properties of materials

 Properties of materials (OCR Gateway GCSE Chemistry)

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2.3 Properties of materials

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2.3 Properties of materials

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11 mark

The size of a nanoparticle is similar to the size of a molecule.

What is the approximate size of a nanoparticle?

  • 0.01 nm

  • 50 nm

  • 1000 nm

  • 10,000 nm

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21 mark

Which statement about nanoparticulate materials is not correct?

  • Nanoparticles are much smaller than atoms.

  • Nanoparticulate materials can be used as catalysts.

  • Nanoparticulate materials have an extremely large surface area to volume ratio.

  • There are possible risks when using nanoparticulate materials which are difficult to predict.

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31 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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41 mark

Which of these statements about nanoparticulate materials is correct?

  • Nanoparticles are much smaller than atoms.

  • Nanoparticulate materials can be used as catalysts.

  • Nanoparticulate materials have a very small surface area to volume ratio.

  • There are no risks when using nanoparticulate materials.

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51 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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11 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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21 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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31 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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4
Sme Calculator1 mark

Particles are grouped into categories depending on their diameter.

Particle X has a diameter of  2.5 x 10-7 m.

Which particle is this most likely to be?

  • Coarse particles

  • Fine particles

  • Nanoparticles

  • Dust particles

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5
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A nanoparticle of a metal oxide is a cube. 

2-3_q6-ocr-gcse-chemistry-mcq

Each side has a length of 82 nm. 

What is the volume of the nanoparticle? 

  • 6.72 x 103 nm3

  • 5.51 x 105 nm3

  •  5.51 x 10-5 nm3

  • 6.72 x 10-3 nm3

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61 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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71 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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8
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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

    Look at the diagrams.

    Which diagram shows a solid with the largest surface area to volume ratio?

    • lump

    • powder

    • chips

    • small-chips

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    151 mark

    What is the approximate size of a nanoparticle?

    • 0.07 nm

    • 0.40 nm

    • 50 nm

    • 1000 nm

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    161 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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    171 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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      181 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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      1
      Sme Calculator      1 mark

      A gold nanoparticle is a cube with sides of 2nm. 

      2-3_q7-ocr-gcse-chemistry-mcq

      What is the simplest surface area to volume ratio of the nanoparticle?

           

      • 24: 8

      • 12:3

      • 16:1 

      • 3:1

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      21 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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        31 mark

        The diameter of one type of carbon nanotube is 20 nm.

        What is 20 nm in metres?

        • 2 × 10-3 m

        • 2 × 10-8 m

        • 2 × 10-20 m

        • 2 × 10-16 m

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        41 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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        51 mark

        A carbon nanotube is 1.4 × 10–9 m wide. A human hair is 1.4 × 10–4 m wide.

        How many times wider is the hair compared to the nanotube?

        • 100

        • 1000

        • 10000

        • 100000

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        61 mark

        Which row explains how the structure of graphene is different from the structure of graphite?

         

        Graphene 

        Graphite

        A

        3 covalent bonds to each carbon atom

        4 covalent bonds to each carbon atom

        B

        covalent bonds in 3D

        covalent bonds in one 2D plane

        C

        intermolecular forces

        no intermolecular forces

        D

        one layer

        many layers

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