O LevelChemistryCambridge (CIE)Exam Questions1. States of Matter1.2 Diffusion

Diffusion (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

1 hour12 questions

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1.2 Diffusion

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1
1 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.

Choose your answer

2
1 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

Choose your answer

1
1 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

✓

✓

✓

B

cross times

cross times

✓

C

✓

cross times

✓

D

cross times

✓

✓

    Choose your answer

    2
    1 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

    Choose your answer

    1
    1 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.

      Choose your answer

      2
      1 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

        Choose your answer

        3
        1 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

        Choose your answer