Physical & ChemicalChanges•Is melted butter still butter?•Is soured milk still milk?•Are the ashes from a fire made of the...
What is a physical change?   Change that affects one or more    physical properties of a substance   A new substance is ...
Examples of Physical Change   Any state change    ◦ Melting    ◦ Freezing    ◦ Evaporating Dissolving Cutting Bending
Examples of Physical Changesin Nature   Water Cycle   Erosion
Can you think of any examples?
What is a chemical change?   One or more substances are changed    into a new substance   New and different properties ...
Examples of a Chemical Change   Cooking   Burning   Rusting
Examples of Chemical Changesin Nature   Carbon Cycle   Nitrogen Cycle   Chemical Weathering
Can you think of any examples?
What are the signs a chemicalchange is happening? Change in color Change in odor Production of heat Production of fizz...
What signs do this changesdemonstrate?                     Change in odor and                     colorChange in odor andc...
Physical or Chemical Change?   Frying an egg?   Physical   or    Chemical
Incorrect. Try again!
Correct!     Try the next one!
Physical or Chemical Change?   Souring Milk?   Physical   or   Chemical
Incorrect. Try again!
Correct!     Try the next one!
Physical or Chemical Change?   Shredding paper?   Physical or Chemical
Incorrect. Try again!
Correct!
Credits   All pictures used were free and    retrieved from www.morguefile.com.
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Physical & Chemical Changes

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Physical & Chemical Changes

  1. 1. Physical & ChemicalChanges•Is melted butter still butter?•Is soured milk still milk?•Are the ashes from a fire made of the same“stuff” as wood?7th GradeBrandy Butcher
  2. 2. What is a physical change? Change that affects one or more physical properties of a substance A new substance is not formed The substance keeps its identity (name)
  3. 3. Examples of Physical Change Any state change ◦ Melting ◦ Freezing ◦ Evaporating Dissolving Cutting Bending
  4. 4. Examples of Physical Changesin Nature Water Cycle Erosion
  5. 5. Can you think of any examples?
  6. 6. What is a chemical change? One or more substances are changed into a new substance New and different properties New identity (name)
  7. 7. Examples of a Chemical Change Cooking Burning Rusting
  8. 8. Examples of Chemical Changesin Nature Carbon Cycle Nitrogen Cycle Chemical Weathering
  9. 9. Can you think of any examples?
  10. 10. What are the signs a chemicalchange is happening? Change in color Change in odor Production of heat Production of fizzing, foam, bubbles Production of sound Production of light
  11. 11. What signs do this changesdemonstrate? Change in odor and colorChange in odor andcolor Change in color
  12. 12. Physical or Chemical Change? Frying an egg? Physical or Chemical
  13. 13. Incorrect. Try again!
  14. 14. Correct! Try the next one!
  15. 15. Physical or Chemical Change? Souring Milk? Physical or Chemical
  16. 16. Incorrect. Try again!
  17. 17. Correct! Try the next one!
  18. 18. Physical or Chemical Change? Shredding paper? Physical or Chemical
  19. 19. Incorrect. Try again!
  20. 20. Correct!
  21. 21. Credits All pictures used were free and retrieved from www.morguefile.com.

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