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Do Now

Do Now. Pick Up You binder Pick up your book Flip to Chapter 6, Activity 1 Take out your data table from yesterday. Do Now: 11/18/09. 1) What do you need for a reaction to take place?

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Do Now

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  1. Do Now • Pick Up You binder • Pick up your book • Flip to Chapter 6, Activity 1 • Take out your data table from yesterday

  2. Do Now: 11/18/09 • 1) What do you need for a reaction to take place? • 2) What can happen when you combine two substances together in a reaction? Think back to your lab yesterday….

  3. Physical vs. Chemical Changes

  4. What’s the Difference? • Matter can change • Examples: Freeze, cut, burn, etc. • 2 types of changes • Physical changes • Chemical changes

  5. What is a solution? Two liquids combined Typically a solute with a solvent

  6. Physical Changes • Matter changes form WITHOUT becoming something new • You start and end with same thing (see below) • Examples: cutting, freezing, melting, etc.

  7. Molecules in Physical Changes

  8. Chemical Changes • Matter changes, becomes NEW substance • Start and end with different things • Usually irreversible (can’t change back) • Examples: burning, rusting, milk going sour

  9. The atoms arrange to make a new substance Molecules in Chemical Changes

  10. Products: the resulting solutions in a reaction Chemical Change = Reaction • Reactants: starting solutions in a reaction

  11. Physical Size Shape Texture Chemical Temperature Color Bubbles/fizzing Smoke Smell Signs of Change

  12. Chemical Reaction Demo • NaHCO3 NaOOCCH3 + HOOCCH3 + H2O + CO2 Baking Soda Sodium Acetate, and Vinegar water, and carbon dioxide

  13. Is it a chemical or physical change? • Sugar dissolving in tea • Chemical Change • Physical Change

  14. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  15. Correct!

  16. Is it a chemical or physical change? • Logs burning • Chemical Change • Physical Change

  17. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  18. Correct!

  19. Is it a chemical or physical change? • Breaking water up by separating it into hydrogen and oxygen • Chemical Change • Physical Change

  20. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  21. Correct!

  22. Is it a chemical or physical change? • Cutting paper • Chemical Change • Physical Change

  23. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  24. Correct!

  25. Is it a chemical or physical change? • Crushing an aspirin • Chemical Change • Physical Change

  26. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  27. Correct!

  28. Is it a chemical or physical change? • Metal rusting • Chemical Change • Physical Change

  29. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  30. Correct!

  31. Is it a chemical or physical change? • An egg rotting • Chemical Change • Physical Change

  32. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  33. Correct!

  34. Is it a chemical or physical change? • An egg breaking • Chemical Change • Physical Change

  35. OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

  36. Correct!

  37. Physical Change v. Chemical Change Make a Venn Diagram to compare the 2 types of changes

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