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Chapter 12.2 : Solids
1. Solids Chapter 12.2 Objectives: Describe the motion of particles in solids and the properties of solids according to the kinetic-molecular theory. Distinguish between the two types of solids. Describe the different types of crystal symmetry. Define crystal structure and unit cell.
2. Properties of Solids and Kinetic-Molecular Theory Particles are more closely packed. Intermolecular forces are much more effective in solids. Hold molecules in fixed position, only vibration movement More ordered than other phases Two types of Solids Crystalline solids: Consist of crystals, which are, a substance in which the particles are arranged in an orderly, geometric, repeating pattern. Amorphous solid: Solids whose particles are arranged randomly Ex: glass and plastic
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4. Physical change of a solid to a liquid by the addition of heat. (Temperature which a solid becomes a liquid)
5. Kinetic energy of particles overcome attractive forces holding them together.