Solids, liquids and gases
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The Particle Model
- All matter is made of particles (atoms or molecules).
- The three states of matter are solid, liquid, and gas.
- Properties depend on particle arrangement and movement.
Solids
- Particles are held tightly together in a regular pattern.
- Particles vibrate around fixed positions.
- Solids have a definite shape and definite volume.
- They are dense and cannot be compressed easily.
- Solids have the least amount of energy.
Liquids
- Particles are close together but can move past each other.
- Liquids have a changing shape (they flow) but a fixed volume.
- They are dense and cannot be compressed easily.
- Liquids have more energy than solids.
Gases
- Particles are far apart with very weak forces between them.
- Gases have no fixed shape and no fixed volume.
- They can be compressed and have low density.
- Particles move quickly in random directions at different speeds.
- Gas pressure is caused by particles colliding with container walls.
- Gases have the most energy; heating increases particle speed.
Density and Water Exception
- Solids are usually the most dense state.
- Water is an exception: liquid water is more dense than ice (solid).
- Ice floats because it is less dense than liquid water.
Particle arrangement and movement
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Câu hỏi luyện tập
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1.Which state of matter has particles that are held tightly together in a regular pattern and vibrate around fixed positions?
Easy- ASolid
- BLiquid
- CGas
- DPlasma
2.Which state of matter can be compressed?
Easy- ASolid
- BLiquid
- CGas
- DBoth solid and liquid
3.Which state of matter has a definite shape and volume?
Easy- ASolid
- BLiquid
- CGas
- DNone of the above
4.Which state of matter has the most energy?
Easy- ASolid
- BLiquid
- CGas
- DAll have the same energy
5.Why does ice float in water?
Medium- AIce is denser than water
- BIce is less dense than water
- CIce has a higher temperature than water
- DIce has more particles than water
6.What happens to the speed of gas particles when the temperature of a gas is increased?
Easy- AThey move more slowly
- BThey move more quickly
- CThey stop moving
- DThey move at the same speed
7.Which of the following correctly describes the movement of gas particles?
Easy- AThey vibrate in fixed positions
- BThey move slowly in the same direction
- CThey move quickly in random directions
- DThey slide past each other
8.A student observes that a substance has no fixed shape but has a fixed volume. Which state of matter is it?
Easy- ASolid
- BLiquid
- CGas
- DPlasma
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