1) What is diffusion? a) The movement of particles from a cold area to a hot area b) The spreading of particles from a region of high concentration to a region of low concentration c) A process that only happens in solids d) The breaking of particles into smaller parts 2) Which of the following best explains why perfume can be smelled from across a room? a) The scent is pulled by gravity b) Air carries sound faster than light c) Particles move randomly and spread out through diffusion d) The perfume evaporates and flies quickly 3) What happens to the rate of diffusion when the temperature increases? a) It decreases b) It stays the same c) It stops d) It increases 4) Why does diffusion happen faster in gases than in liquids? a) Gases are heavier b) Gas particles are closer together c) Gas particles move faster and have more space between them d) Liquids have no particles 5) How does particle theory explain diffusion? a) Particles are in constant random motion and spread out over time b) Particles change shape to move c) Particles are fixed and do not move d) Particles float upward 6) Which of these is an example of diffusion in a liquid? a) A solid turning into a gas b) Salt spreading evenly in a glass of water c) Ice melting in the sun d) Smoke rising in the air 7) In which state of matter is diffusion the slowest? a) solid b) liquid c) gas d) plasma

Diffusion Grade 7

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