O LevelChemistryCambridgeTopic Questions1. States of Matter1.2 Diffusion

Diffusion (Cambridge O Level Chemistry)

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11 mark

A student noted the following observation in his laboratory notebook:

“The particles moved slowly from an area of high concentration to an area of low concentration.”

Which process is being described?

  • Diffusion of substance in a liquid.

  • The particles of a solid during melting.

  • A liquid being frozen.

  • Diffusion of a substance through air.

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21 mark

A small amount of bleach was accidentally spilled on a kitchen floor. After a while it was observed that the floor appeared to be dry and the whole kitchen smelled of bleach.

Which processes have occurred?

  • Evaporation and diffusion

  • Distillation and diffusion

  • Evaporation only

  • Diffusion only

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11 mark

The rate of diffusion of two gases, methane, CH4, and propene, C3H6, is measured using the apparatus shown.

q11-1-mcq-hard-cie-igcse-che

Which gas diffuses at a faster rate and why?

  Fastest gas Reason
A Propene Propene molecules are heavier and so move faster.
B Methane Methane is a lighter molecule.
C Propene Propene is unsaturated so is more reactive.
D Methane Methane molecules are smaller so fit through the hole more easily.

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21 mark

Hydrogen chloride and ammonia are gases which are given off by cotton wool soaked in concentrated solutions and placed at either end of a glass tube as shown.

When the gases react together they produce ammonium chloride, a white solid.

Which line on the diagram correctly shows where the ammonium chloride is formed?

q3-1-1-mcq-hard-cie-igcse-che

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31 mark

A student accidentally left a bottle of ammonia open in the corner of a laboratory. After a few minutes the entire laboratory smelled of ammonia.

Which process has occurred?

  • Dispersion

  • Diffusion

  • Evaporation

  • Distillation

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11 mark

The diagram shows what happens when a blue soluble crystal is placed in a beaker of water.

q3

Which row correctly describes the processes taking place?

  Chemical process Dissolving Diffusion
A ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}
B ×{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ×{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}
C ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ×{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}
D ×{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true} ✓{"language":"en","fontFamily":"Times New Roman","fontSize":"18","autoformat":true}

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21 mark

Which substance would diffuse most quickly?

  • carbon dioxide at 0 °C

  • carbon dioxide at 25 °C

  • neon at 0 °C

  • neon at 25 °C

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