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The Kinetic Theory of Matter The main points of the kinetic theory are: 1. All matter is made up of tiny, invisible, moving particles. 2. Particles of different substances have different sizes. 3. Smaller particles move faster than heavier ones at a given temperature. 4. As the temperature rises, the particles move faster because the particles have more kinetic energy. 5. In a solid, the particles are a very close together and they can only vibrate about fixed positions. 6. In a liquid, the particles are a little further apart. They have more energy and they can move around each other. 7. In a gas, the particles are far apart. They move rapidly and randomly in all the space they can find. This diagram shows the particles in the three states of matter: The Collision Theory of Chemical Reactions A chemical reaction cannot happen unless particles in the reacting substances collide with each other. There are three main conditions which...

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