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Unit 3 pp #5 7th grade

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Unit 3 pp #5 7th grade

  1. 1. Section 3 Three States of Matter<br />Chapter 17<br />States of Matter<br />States of matter are the physical states in which a substance can exist. The three most familiar states of matter are: solid, liquid, and gas.<br />
  2. 2. Section 3 Three States of Matter<br />Chapter 17<br />Solids<br />Definite Shape and Volume A solid is the state of matter that has a definite shape and size. The particles in a solid move but not fast enough to overcome the attraction between them.<br />Two Kinds of Solids<br /><ul><li>Crystalline solids have an orderly three-dimensional arrangement of particles in a pattern of rows.
  3. 3. Amorphous solids are made of particles that do not have a special arrangement.</li></li></ul><li>Section 3 Three States of Matter<br />Chapter 17<br />Liquids<br />Change in Shape but Not Volume A liquid is a state of matter that has a definite volume but takes the shape of its container. The particles in a liquid move fast enough to overcome some of the attractive forces between them.<br />Unique Characteristics of Liquids<br /><ul><li>Surface tension is a force that acts on the particles on the surface of a liquid.
  4. 4. Viscosity is a liquid’s resistance to flow.</li></li></ul><li>Section 3 Three States of Matter<br />Chapter 17<br />Gases<br />Change in Both Shape and Volume A gas is a state of matter that has no definite shape or volume. The particles of a gas move quickly and break away completely from one another.<br />The amount of empty space between gas particles can change, thereby changing the volume.<br />
  5. 5. Section 3 Three States of Matter<br />Chapter 17<br />Changes of State<br />A change of state is the change of a substance from one physical state to another. Each state of matter can change into other states by changing the amount of energy in the substance.<br />Melting and Freezing Melting is the change of state in which a solid becomes a liquid when energy is added to a substance. Freezing is the change of state in which a liquid becomes a solid when energy is removed.<br />
  6. 6. Section 3 Three States of Matter<br />Chapter 17<br />Changes of State, continued<br />Evaporation, Boiling, and Condensation Evaporationis the change of a substance from a liquid to a gas at the surface. Boiling is the change of a liquid to a gas throughout the substance. Condensation is the change of a gas to a liquid.<br />Sublimation: Solid to GasSublimation is the change of state in which a solid changes directly into a gas.<br />

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