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Physical & Chemical Changes

Physical & Chemical Changes. Demonstration powerpoint. Physical Changes. Physical changes are when the substance is still the same thing. It has only changed forms. Size. Breaking a piece of mossy zinc into pieces. Shape. Bending a piece of magnesium strip. State.

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Physical & Chemical Changes

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  1. Physical & Chemical Changes Demonstration powerpoint

  2. Physical Changes • Physical changes are when the substance is still the same thing. It has only changed forms.

  3. Size • Breaking a piece of mossy zinc into pieces.

  4. Shape • Bending a piece of magnesium strip.

  5. State • Boiling off the water from salt water. You are left with the salt. Evaporation. • Dry ice (frozen CO2) goes from a solid to a gas; this is called sublimation.

  6. Chemical Changes • Chemical Changes are when a new substance is produced that was not there originally.

  7. Color • (unexpected color change)

  8. Clear liquid (ammonia) + clear liquid (PHTH)

  9. Add PHTH to ammonia

  10. = pink (unexpected color change)

  11. Temperature • (unexpected temperature change)

  12. Ammonium nitrate + water

  13. Starting temperature 20⁰ C

  14. Add ammonium nitrate to water

  15. a temperature decrease of 8⁰ C

  16. Bubbles & Fizz

  17. HCl + magnesium strip

  18. = bubbles and fizz

  19. New Substance • (precipitate)

  20. Milk + vinegar =

  21. Swirl it around

  22. Chunky stuff

  23. Steel wool + vinegar = rust • Another precipitate!

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