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Understanding Physical, Chemical, and Nuclear Changes in Matter

This overview explores the differences between physical, chemical, and nuclear changes in substances. Physical changes alter a substance's form or appearance without changing its chemical identity, while chemical changes result in new substances forming through reactions. Nuclear changes involve alterations in the atom's nucleus, leading to new elements. Evidence of chemical changes includes gas release, precipitate formation, energy changes, and color changes. The properties of substances, both physical and chemical, characterize how they interact and change in reactions.

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Understanding Physical, Chemical, and Nuclear Changes in Matter

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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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