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Chemical and Physical Changes

Chemical and Physical Changes. Physical Changes. Only changes physical properties, does not become a new substance (usually reversible). Phase changes Dissolving Breaking. Chemical Changes. When 1 or more substances form a new substance. Evidence: Production of a gas (not phase change)

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Chemical and Physical Changes

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  1. Chemical and Physical Changes

  2. Physical Changes • Only changes physical properties, does not become a new substance (usually reversible). • Phase changes • Dissolving • Breaking

  3. Chemical Changes • When 1 or more substances form a new substance. • Evidence: • Production of a gas (not phase change) • Formation of a precipitate • Change in color • Change in temperature (without heat being added or taken away) • Emission of light or odor

  4. Is it a chemical or physical change? • Sugar dissolving in tea • Chemical Change • Physical Change

  5. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  6. Correct!

  7. Is it a chemical or physical change? • Logs burning • Chemical Change • Physical Change

  8. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  9. Correct!

  10. Is it a chemical or physical change? • Cutting paper • Chemical Change • Physical Change

  11. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  12. Correct!

  13. Is it a chemical or physical change? • Crushing an aspirin • Chemical Change • Physical Change

  14. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  15. Correct!

  16. Is it a chemical or physical change? • Metal rusting • Chemical Change • Physical Change

  17. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  18. Correct!

  19. Is it a chemical or physical change? • Lighter fluid burning • Chemical Change • Physical Change

  20. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  21. Correct!

  22. Is it a chemical or physical change? • An egg rotting • Chemical Change • Physical Change

  23. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  24. Correct!

  25. Is it a chemical or physical change? • An egg breaking • Chemical Change • Physical Change

  26. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  27. Correct!

  28. Law of Conservation of Mass • No matter what change occurs: mass before = mass after # of atoms before = # of atoms after

  29. Images Cited • http://www.learner.org/channel/courses/essential/physicalsci/session4/closer1.html • http://www.hcbe.net/itc/powerpoints/science/files/CF61DBA93ED44B4B8A5C75E1A1AEB2CC.ppt

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