1. A physical property is a property that can be measured and observed without changing the chemical makeup of the substance.
2. Three physical properties of water are a density, freezing point, and boiling point.
3. Solid water is less dense than water.
4. When water is heated it turns to gas and when it cools it condenses back to its liquid state. When water is at its freezing point (0 Celsius) it freezes to solid water.
5. A heterogenous mixture is not uniform or the same throughout. Homogenous mixtures and uniform throughout.
6. You need to know the density of water and gasoline to be able to predict which liquid will be on top.
7. a) suspension b) colloid c) colloid d) solution e) suspension f) colloid
8) The air is a colloid because the air particles are small enough to stay suspended. There are small particles in the air, which means the air in the room is a colloid and the particles are too small to come out in a filter.
9)
10. It would be a colloid because the beam of light is scattered due to the reflection of the suspended particles.
11. A substance is a colloid because the particles are too small to filter.
12. a) compound b) element c) compound d) element e) compound f) element g) element
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