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Physical and Chemical Changes

Physical and Chemical Changes

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Physical and Chemical Changes

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  1. Physical and Chemical Changes

  2. Table of Contents Add Physical/Chemical Changes Turn to the next clean page and title it Physical/Chemical Changes

  3. Matter Review • Matter is everywhere. • Matter is anything that takes up space and has mass. • Matter is constantly experiencing both chemical and physical changes.

  4. Physical Change • Physical changes occur when matter changes its property but not its chemical nature. • Physical property changes could include a change in: texture, shape, size, color, volume, mass, weight, and state (melting, boiling, freezing).

  5. Physical Property Changes • Texture • Ex: A piece of wood that has been sanded with sandpaper. • It is still wood, only the texture has been changed.

  6. Physical Property Changes • Shape • Ex. A piece of paper that has been crumpled up into a ball. • It is still paper, but a different shape.

  7. Physical Property Changes • Size • Ex. A piece of cloth that has been cut. • It is still cloth, it is just a different size

  8. Physical Property Change • Color • Ex. Painting your fingernails. • They are still fingernails, they are just a different color.

  9. Change in State EX: Freezing Water It is still water, just in a solid state Physical Property Change

  10. Physical Property Change • Change in State • Ex. Melting wax • It is still wax, just in a different form

  11. Physical Property Change • Change in State • EX. Water Boiling • It is still H2O, only in gas state

  12. Chemical Change • Chemical changes are changes matter undergoes when it becomes new or different matter. • Most of the time, the matter cannot go back to the original substance. • To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, rusting or tarnishing.

  13. Chemical Property Change • Paper Burning. • Does it produce light, and smoke? • Can you return it to its original form? • IT MUST BE CHEMICAL

  14. Chemical Property Change • Baking a cake • Do you have the same substance you began with? • Can you get it back into its original ingredients? • IT MUST BE CHEMICAL!

  15. Chemical Property Change • Food Digesting • Can you get back the original food you started with? • BOY I HOPE NOT! • IT MUST BE CHEMICAL!

  16. Chemical Property Change • Car Rusting

  17. Chemical Change • A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

  18. Video Brainpop

  19. Is it a chemical or physical change? • Sugar dissolving in tea • 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? • Logs burning • 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? • Cutting paper • 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. Is it a chemical or physical change? • Crushing an aspirin • Chemical Change • Physical Change

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

  30. Correct!

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

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

  33. Correct!

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

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

  36. Correct!

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

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

  39. Correct!

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

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

  42. Correct!

  43. NOTES Physical Properties/Changes change in: texture, shape, size, color, odor, volume, mass, weight, and density or change in state. Chemical Properties/Changes Change in: color, bubbling and fizzing, light production, smoke, temperature change, rusting, tarnishing

  44. NOTES Physical _________/Changes change in: _______, shape, _______, color, volume, mass, _______, and density and change in state. Chemical Properties/________ Change in: color, _______ and fizzing, light _________, smoke, temperature _________ , rusting and tarnishing