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GCSEChemistryOCRChemistry A (Gateway)Exam Questions1. ParticlesThe Particle Model

The Particle Model (OCR GCSE Chemistry A (Gateway)): Exam Questions

Exam code: J248

35 mins19 questions

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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

Choose your answer

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

Choose your answer

31 mark

Which of these is a physical change?

  • Burning wood

  • Melting wax

  • Neutralising an acid

  • Rusting iron

Choose your answer

41 mark

Substances exist as solids, liquids or gases.

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What change of state occurs at Y?

  • Melting

  • Freezing

  • Boiling

  • Condensation

Choose your answer

51 mark

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

  • Chemical change

  • Evaporation

  • Freezing

  • Physical change

Choose your answer

61 mark

Where is most of the mass found in an atom?

  • electrons

  • neutrons

  • nucleus

  • protons

Choose your answer

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  

Choose your answer

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 

Choose your answer

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

Choose your answer

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

Choose your answer

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

    Choose your answer

    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.

    Choose your answer

    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

      Choose your answer

      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.

      Choose your answer

      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.

      Choose your answer

      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.

      Choose your answer

      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.

      Choose your answer