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Physical and Chemical Changes !!

Physical and Chemical Changes !!. Physical Change. Physical changes are easy to identify. If only the form of a substance changes you have observed a physical change.

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Physical and Chemical Changes !!

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  1. Physical and Chemical Changes !!

  2. Physical Change • Physical changes are easy to identify. If only the form of a substance changes you have observed a physical change. • An example of a physical change occurs when making a baseball bat. Even though the wood has changed shape, the chemical nature of the wood has not been changed.

  3. The bat and the original piece of wood are still the same chemical substance.

  4. Chemical ChangeDuring a chemical change, substances are changed into different substances. In other words the composition (what the object is made of) changes.

  5. Signs that tell that a chemical change has taken place: 1. Drastic color Change

  6. 2. Gas or bubbles are formed.

  7. Another example of gas/bubbles.

  8. 3. Different odor

  9. 4. Light and/or sound is given off.

  10. 5. Temperature changesExothermic –heat going out – warmerEndothermic – heat coming in - cooler

  11. 6. A solid called a precipitate is formed.

  12. Use what you have learned!! • Look at the following pictures and: • Write C if you think the picture is a chemical change. • Write P if you think the picture is a physical change.

  13. Breaking Glass

  14. Physical Change

  15. Inflating a Ball

  16. Physical Change

  17. Burning Logs

  18. Chemical Change

  19. Rotting Fruit

  20. Chemical Change

  21. Crumpled Paper

  22. Physical Change

  23. Fireworks

  24. Chemical Change

  25. Photosynthesis

  26. Chemical Change

  27. Breaking a Pencil

  28. Physical Change

  29. Solution changing to a solid.

  30. Chemical Change

  31. Burning of the Sun

  32. Chemical Change

  33. Painting a Room

  34. Physical Change

  35. Chalk drawings on a driveway.

  36. Physical Change

  37. Rusting of a Mailbox

  38. Chemical Change

  39. Lighting a Match

  40. Chemical Change

  41. Cutting Hair

  42. Physical Change

  43. Tarnish on Silver

  44. Chemical Change

  45. Mowing the Lawn

  46. Physical Change

  47. Substance producing light.

  48. Chemical Change

  49. Water’s different states of matter

  50. Physical Change

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