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Changes and Properties

Changes and Properties. Physical, Chemical, and Nuclear. Physical Change. Form or appearance changes , but the properties of the substance are the same (same melting point, chemical composition, etc.). Chemical Changes.

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Changes and Properties

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  1. Changes and Properties Physical, Chemical, and Nuclear

  2. Physical Change • Form or appearance changes, but the properties of the substance are the same (same melting point, chemical composition, etc.)

  3. Chemical Changes • Identities of substances change during a reaction and new substances form

  4. Nuclear Changes • Nucleus of the atomchanges to form new elements

  5. Evidence of Chemical Change • 1. Release of a Gas • 2. Formation of a Precipitate (powdery solid) • 3. Release or Absorption of Energy (heat or light) • 4. Color Change **Chemical Reactions

  6. Properties • Property – characteristic (way to describe) an object or substance

  7. Physical Properties • Those properties that we can determine without changing the identity of the substance we are studying • Examples: • Hardness • Color • Melting Point • Density

  8. Chemical Properties • Describe the way a substance can change or react to form other substances • Examples • Flammable • Reacts with ______

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