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72 SCIPAD - BIG IDEAS - BOOK 1
THE NATURE OF MATTER
1. Using the words and phrases below, explain the following observations:
particles - high concentration - low concentration - diffusion
TIME
(a) If a tea bag is left undisturbed in a cup of water, the water will eventually darken.
(b) If a rock is placed into a glass of water, the rock will not diffuse into the water.
TIME
2. Complete the following sentences.
Diffusion occurs fastest in g because the particles have more space and
therefore m around more.
Diffusion still occurs in liquids but is s than in a gas because the particles
have less e . The rate of d in liquids can be
increased by h the liquid.
Diffusion in s only occurs if the solids are soluble in a liquid. The particles in
insoluble solids are packed t together and are unable to m .
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