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GCSEChemistry: Combined ScienceOCR GatewayExam Questions1. Particles1.1 The Particle Model

 The Particle Model (OCR Gateway GCSE Chemistry: Combined Science)

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1.1 The Particle Model

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1.1 The Particle Model

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11 mark

This particle model shows the particles in iron.

q1-paper-1-june-2019-ocr-gcse-chem

What state does this particle model represent?

  • Gas

  • Liquid

  • Plasma

  • Solid

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21 mark

Substances can exist in three states of matter.

Solid space rightwards arrow over leftwards arrow for blank of Liquid space rightwards arrow over leftwards arrow for bold Y of space Gas

What is change of state Y called?

  • Condensing

  • Evaporating

  • Freezing

  • Melting

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31 mark

Which of these is a physical change?

  • Burning wood

  • Melting wax

  • Neutralising an acid

  • Rusting iron

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41 mark

Substances exist as solids, liquids or gases.

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What change of state occurs at Y?

  • Melting

  • Freezing

  • Boiling

  • Condensation

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51 mark

Which term is a correct description of ice turning from a solid to a liquid?

  • Chemical change

  • Evaporation

  • Freezing

  • Physical change

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61 mark

Where is most of the mass found in an atom?

  • Electrons

  • Neutrons

  • Nucleus

  • Protons

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11 mark

Which of the following is not a chemical change?

  • Iron railings becoming rusty 

  • Burning a piece of wood 

  • Neutralising an acid with alkali

  • Dissolving salt in water  

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21 mark

A gas can be represented using the following model. 

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Which of the following is not a limitation of the particle model? 

  • The shape of the particles is not considered 

  • The space between the particles is proportionate to the size of the particles 

  • The particles are assumed to be solid

  • There are no forces shown between the particles 

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31 mark

Substance Y melts at -101 oC and boils at -35 oC.

What is the state of substance Y at at -110 oC? 

  • Solid

  • Liquid

  • Gas

  • Aqueous

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41 mark

Solids, liquids and gases have different properties due to the arrangement of their particles.

Which statement is not a property of a liquid?

  • Particles are close together in a random arrangement

  • Cannot be be compressed as no space between particles

  • Have a fixed volume but not a fixed shape

  • Particles have no forces between them and can move in all directions

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51 mark

What is the best description of the particles in a liquid?

  Distance between particles Movement of particles
A Close together in continuous random motion
B Close together vibrating about a fixed point
C Far apart in continuous random motion
D Far apart vibrating about a fixed point

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    61 mark

    The diagram shows a 3D space filling model of methane.

    methane-3d-space-fill-model

    What are the limitations of showing methane as a 3D space filling model?

    • It does not show how close together the atoms are.

    • It does not show how many electrons are in a bond.

    • It does not show the relative size of the atoms.

    • It does not show the relative volume that the atoms take up.

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    11 mark

    Substance Z has a melting point of -7 oC and boiling point of 59 oC. 

    What is the the state of Z at 0 oC and 100 oC?  

      State at 0 oC  State at 100 oC
    A solid gas
    B gas liquid
    C liquid solid
    D liquid gas

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      21 mark

      During the phase change from liquid to gas at the boiling point, which statement about the particles is not correct?

      • The average kinetic energy of the particles increases.

      • The particles gain enough energy to overcome all intermolecular forces.

      • The particles maintain their random arrangement but become further apart.

      • The particles maintain a constant temperature during the phase change.

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      31 mark

      Why does a liquid not maintain a fixed shape but maintain a fixed volume?

      • The particles have no forces between them.

      • The particles can move freely.

      • The particles slide past each other while maintaining contact.

      • The particles vibrate in fixed positions.

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      41 mark

      Which of the following best describes a limitation of using the particle model to represent changes of state?

      • The model suggests particles have strong forces between them at all times.

      • It assumes particles change size when they change state.

      • The model does not accurately show the forces of attraction between particles.

      • It suggests particles are large and have a fixed shape.

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      51 mark

      Chemical changes differ from physical changes as shown by:

      • A change in the arrangement of atoms causing a greater distance between particles.

      • A change in the arrangement of atoms resulting in new chemical properties.

      • An increase in the distance between particles causing a change of state.

      • A change in the distance between particles resulting in no change in the particles.

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