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.

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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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11 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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21 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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31 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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41 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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51 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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61 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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    71 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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