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Chapter 3. Section Two: Changes of State. Bellringer. What happens to water molecules when water boils? Melting snow is a change of state from a solid to a what? What is the reverse process of melting? Compare the properties of ice, liquid water, and water vapor. Open your books to page.

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chapter 3

Chapter 3

Section Two: Changes of State

bellringer
Bellringer
  • What happens to water molecules when water boils?
  • Melting snow is a change of state from a solid to a what?
  • What is the reverse process of melting?
  • Compare the properties of ice, liquid water, and water vapor.
energy and changes of state
Energy and Changes of State
  • What happens when a substance changes from one state of matter to another?
  • The identity of a substance does not change during a change of state, but the energy of a substance does change.
        • ADD ENERGY = the particles move faster
        • REMOVE ENERGY = particles move slower
energy and changes of state continued
Energy and Changes of State, continued
  • Some changes of state require energy.
  • Changes of state that require energy are melting, evaporation, and sublimation.
    • evaporation: the change of state from a liquid to a gas
    • sublimation: the process in which a solid changes directly into a gas
energy and changes of state continued1
Energy and Changes of State, continued
  • Energy is released in some changes of state.
  • Changes of state that release energy are freezing and condensation.
    • condensation: the change of state from a gas to a liquid
conservation of mass and energy
Conservation of Mass and Energy
  • What happens to mass and energy during physical and chemical changes?
  • Mass and energy are both conserved. Neither mass nor energy can be created or destroyed.
conservation of mass and energy continued
Conservation of Mass and Energy, continued
  • Mass cannot be created or destroyed.
    • In chemical changes, as well as in physical changes, the total mass of the substances undergoing the change stays the same before and after the change.
    • This is the law of conservation of mass.
conservation of mass and energy continued1
Conservation of Mass and Energy, continued
  • Energy cannot be created or destroyed.
    • Energy may be changed to another form during a physical or chemical change, but the total amount of energy present before and after the change is the same.
    • This is the law of conservation of energy.
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