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Physical and Chemical Changes

Physical and Chemical Changes. How can you to tell the difference???. Physical changes are those changes that DO NOT result in the production of a new substance. . NEW.

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Physical and Chemical Changes

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  1. Physical and Chemical Changes How can you to tell the difference???

  2. Physical changes are those changes that DO NOT result in the production of a new substance.  NEW

  3. **If you melt a block of ice, you still have H2O at the end.**If you break a bottle, you still have glass.**Painting your nails will not stop them from being fingernails. 

  4. Some, but not all physical changes can be reversed.You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!

  5. Physical Change • Substance may seem different, but the way the atoms link up is the same.

  6. It’s a physical change if… • It changes shape • It changes size

  7. It’s a physical change if… • It changes phase • freezes • Boils • evaporates • condenses

  8. It’s a physical change if… • It dissolves

  9. CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.

  10. FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN

  11. REACTIVITY:How readily (easily) a substance combines chemically with other substances.

  12. Chemical Change • Changes the organization of atoms and molecules • Makes new substances

  13. **When you burn a log in a fireplace, you release carbon.  **When you light your Bunsen burner in lab, you produce water and carbon dioxide.  **When you mix baking soda and vinegar, you produce CO2.

  14. It could be a chemical change if…. • It burns • Production of heat or light • Temperature changes without heating/cooling

  15. It could be a chemical change if... • It bubbles • It produces a gas

  16. It could be chemical change if... • Production of sound

  17. It could be chemical change if... • It changes properties • Change in odor or taste

  18. It could be chemical changeif... • It changes color

  19. It’s a chemical changeif... • It forms a precipitate • It forms a new substance

  20. Common examples of chemical changes…digestion, respiration, photosynthesis, burning, and decomposition. 

  21. Physical or Chemical Change? • Painting a wood block red • PHYSICAL

  22. Physical or Chemical Change? • Burning Paper • CHEMICAL

  23. Physical or Chemical Change? • Sugar dissolving in water • PHYSICAL

  24. Physical or Chemical Change? • Iron turning red when heated • PHYSICAL

  25. Physical or Chemical Change? • Evaporation • PHYSICAL

  26. Physical or Chemical Change? • A pond freezing in winter • PHYSICAL

  27. Physical or Chemical Change? • Melting ice • PHYSICAL

  28. Physical or Chemical Change? • Digestion of food • CHEMICAL

  29. Physical or Chemical Change? • Cutting wire • PHYSICAL

  30. Physical or Chemical Change? • Mixing cake batter • PHYSICAL

  31. Physical or Chemical Change? • Cutting fabric • PHYSICAL

  32. Physical or Chemical Change? • Baking muffins • CHEMICAL

  33. Physical or Chemical Change? • Shattering glass • PHYSICAL

  34. Physical or Chemical Change? • Decomposition of old leaves • CHEMICAL

  35. Physical or Chemical Change? • Wrinkling a shirt • PHYSICAL

  36. Physical or Chemical Change? • An old nail rusting • CHEMICAL

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