1. Use the particle model of matter to explain why solids have a fixed shape, but gases fill the shape of the container they are in.
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2. Use the particle model of matter to explain why you can compress a gas easily, but you cannot compress a liquid very easily.
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3. Think of a bag of cake flour. You can pour the cake flour out of the bag and into a mixing bowl. Does this mean the flour is a liquid? Explain whether you think the cake flour (and all powders) are solids or liquids.
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2. Use the particle model of matter to explain why you can compress a gas easily, but you cannot compress a liquid very easily.
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3. Think of a bag of cake flour. You can pour the cake flour out of the bag and into a mixing bowl. Does this mean the flour is a liquid? Explain whether you think the cake flour (and all powders) are solids or liquids.
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1. The particle model of matter states that matter is made up of tiny particles (atoms and molecules) that are constantly in motion. In a solid, these particles are packed closely together and are not able to move around very much. This means that solids have a fixed shape and do not change shape easily. In contrast, the particles in a gas are much further apart and are able to move around freely. This means that gases will fill the shape of the container they are in, because the particles can move to fill the entire space.
2. In the particle model of matter, the particles in a gas are much further apart than the particles in a liquid. This means that the particles in a gas have more space to move around and can be compressed more easily. In contrast, the particles in a liquid are much closer together and do not have as much space to move around. This means that liquids are much more difficult to compress.
3. Powders such as cake flour are solids, not liquids. Although they can be poured, powders are not fluids, they are made of solid particles that are small and dry, they can be poured because they are dry and fine, but they still keep their solid properties, they can be shaped, they can be cut and they have a defined volume.
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