5.1 Notes

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5.1 Notes

  1. 1. 5.1 The nature of chemical reactions Pages 148 - 153
  2. 2. Goal 1 Understand what occurs during a chemical reaction and recognize the signs
  3. 3. <ul><li>Each compound or element </li></ul><ul><ul><li>Has its own physical properties </li></ul></ul><ul><ul><ul><li>Taste </li></ul></ul></ul><ul><ul><ul><li>Melting temp </li></ul></ul></ul><ul><ul><ul><li>Boiling temp </li></ul></ul></ul><ul><ul><ul><li>Color </li></ul></ul></ul>
  4. 4. <ul><li>Chemical reactions rearrange atoms </li></ul><ul><ul><li>Reactants at start </li></ul></ul><ul><ul><li>Compounds are changed </li></ul></ul><ul><ul><li>Products at end </li></ul></ul><ul><ul><li>New properties shown </li></ul></ul>2H 2 + O 2  2 H 2 O
  5. 5. <ul><li>Signs of chemical reaction </li></ul><ul><ul><li>Gas formed </li></ul></ul><ul><ul><ul><li>Bubbles </li></ul></ul></ul><ul><ul><ul><li>Odor </li></ul></ul></ul><ul><ul><ul><li>Smoke </li></ul></ul></ul>
  6. 6. <ul><li>Signs of chemical reaction </li></ul><ul><ul><li>New solid formed </li></ul></ul>
  7. 7. Sodium sulfide + cadmium nitrate  cadmium sulfide (clear liquid) (clear liquid) (yellow solid)
  8. 8. <ul><li>Signs of chemical reaction </li></ul><ul><ul><li>Color change </li></ul></ul>
  9. 9. <ul><li>Signs of chemical reaction </li></ul><ul><ul><li>Heat / light energy release </li></ul></ul>
  10. 10. <ul><li>Signs of chemical reaction </li></ul><ul><ul><li>Corrosion </li></ul></ul>
  11. 11. Goal 2 Describe energy movement and the difference between exothermic and endothermic reactions
  12. 12. <ul><li>Break bonds </li></ul><ul><ul><li>Reactant break-up </li></ul></ul><ul><ul><li>Energy added </li></ul></ul><ul><ul><li>Heat, light, electricity, sound </li></ul></ul><ul><li>Form bonds </li></ul><ul><ul><li>Product formation </li></ul></ul><ul><ul><li>Energy released </li></ul></ul>2H 2 + O 2  2 H 2 O
  13. 13. <ul><li>Energy is conserved in chemical reactions </li></ul><ul><li>All accounted for (what goes in…) </li></ul><ul><ul><li>Absorbed </li></ul></ul><ul><ul><li>Stored </li></ul></ul><ul><ul><li>Released </li></ul></ul>
  14. 14. <ul><li>Exothermic </li></ul><ul><ul><li>Overall reaction releases energy </li></ul></ul><ul><ul><li>Reactants had more stored energy than products </li></ul></ul>
  15. 15. <ul><li>Endothermic </li></ul><ul><ul><li>Overall reaction absorbs energy </li></ul></ul><ul><ul><li>Reactants had less stored energy than products </li></ul></ul>

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