Test Recap
Density is the degree of compactness of a substance. The more
closely packed a materials particles are, the greater the density of
the material.
1. What has the greatest density, water vapour, liquid water, or
solid water (ice).
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2. Air is 78% nitrogen, 21% oxygen and 1% other trace
compounds. Is air a mixture, an element, or a compound?
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3. Is carbon dioxide an element, a compound or a mixture?
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4. Is salt water an element, a compound or a mixture?
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5. Is pure water an element, a compound or a mixture?
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6. Is carbon dioxide (a gas) less or more dense than carbon in the
form of a diamond?
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7. Are mixtures chemically combined?
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8. A __________________ is two or more elements that are
chemically combined
Diffusion Recap:
1. Gasses move from ______ concentration to ___ concentration.
2. How does the weather affect the speed of diffusion?
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3. When particles diffuse, what direction to they move in?
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4. What kinds of materials allow diffusion to happen easily?
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5. Draw gas particles that are in high concentration.
6. Draw gas particles in low concentration.
Elements, Compounds and Mixtures
Which particles here are pure and which are impure?