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Chemical Changes

Chemical Changes. What are chemical changes?. All have 2 parts. All have 2 parts Reactants- the substances you start with. All have 2 parts Reactants- the substances you start with Products- the substances you end up with. All have 2 parts Reactants- the substances you start with

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Chemical Changes

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  1. Chemical Changes

  2. What are chemical changes? • All have 2 parts

  3. All have 2 parts • Reactants- the substances you start with

  4. All have 2 parts • Reactants- the substances you start with • Products- the substances you end up with

  5. All have 2 parts • Reactants- the substances you start with • Products- the substances you end up with • Reactants turn into the products

  6. All have 2 parts • Reactants- the substances you start with • Products- the substances you end up with • Reactants turn into the products • Matter is not ________or_________

  7. All have 2 parts • Reactants- the substances you start with • Products- the substances you end up with • Reactants turn into the products • Matter is not created or_________

  8. All have 2 parts • Reactants- the substances you start with • Products- the substances you end up with • Reactants turn into the products • Matter is not created or destroyed

  9. Evidence of Chemical Reactions • Just because the evidence is there does NOT mean that it is a chemical reaction

  10. Evidence • Formation of Gas

  11. Evidence • Formation of Gas Observations:

  12. Evidence • Formation of Gas Observations: • Bubbles • Smoke • Odor/Fumes

  13. Evidence • Formation of Gas Observations: • Bubbles • Smoke • Odor/Fumes Example: The Solvay Process (0:31)

  14. Evidence • Change in Color

  15. Evidence • Change in Color Observations:

  16. Evidence • Change in Color Observations: • Be careful…some changes in color are physical changes!

  17. Evidence • Change in Color Observations: • Be careful…some changes in color are physical changes! Example: Bromine and Alcohol (1:00)

  18. Evidence • Formation of a Solid (Precipitate)

  19. Evidence • Formation of a Solid (Precipitate) Observations:

  20. Evidence • Formation of a Solid (Precipitate) Observations: • Cloudy • Foggy • Solid at bottom

  21. Evidence • Formation of a Solid (Precipitate) Observations: • Cloudy • Foggy • Solid at bottom Example: Precipitate Reaction (0:25)

  22. Evidence • Change in Heat or Light Energy

  23. Evidence • Change in Heat or Light Energy • Observations:

  24. Evidence • Change in Heat or Light Energy • Observations: • Gets warm/ hot/ cold • Spark or explosion • Glow

  25. Evidence • Change in Heat or Light Energy • Observations: • Gets warm/ hot/ cold • Spark or explosion • Glow • Example: Glow Sticks (3:00)

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