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Chemical Changes

This article explores chemical changes, focusing on the two key components: reactants and products. Reactants are the starting substances, while products are what result from the chemical reaction. The law of conservation of mass indicates that matter is neither created nor destroyed during these processes. Various evidence of chemical changes is discussed, including the formation of gas (bubbles and odor), color changes, the creation of solids (precipitates), and energy changes (heat or light). Examples illustrate these concepts for clarity.

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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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