5th Grade-Ch. 12 Lesson 2 What are some kinds of chemical reactions

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5th Grade-Ch. 12 Lesson 2 What are some kinds of chemical reactions

  1. 1. Ch. 12 Lesson 2 What are some kinds of chemical reactions?
  2. 2. Which cleans tarnished pennies better- water, Coke or vinegar? Hypothesis: I think that the ____ will clean the tarnished penny the best because ____. Coke 2 After (Wed.) Before (Mon.) Penny Vinegar 1 Water 3
  3. 3. chemical equation <ul><li>shows what happens during a chemical reaction in a shorter, easier way </li></ul><ul><li>uses symbols instead of words </li></ul>
  4. 4. structure of a chemical equation: <ul><li>reactants = substances used in reaction (found before arrow) </li></ul><ul><li>products = substances made during reaction (found after arrow) </li></ul>
  5. 5. <ul><li>2SO 2 + O 2 + 2H 2 0  2H 2 SO 4 </li></ul><ul><li>2H 2 O  2H 2 + O 2 </li></ul>
  6. 6. Law of Conservation of Mass <ul><li>Matter is not created or destroyed during a chemical reaction </li></ul><ul><li>Total mass of reactants = total mass of products </li></ul>
  7. 7. Types of Chemical Reactions
  8. 8. decomposition reaction <ul><li>compounds split apart  simpler products (compounds or elements) </li></ul>
  9. 9. decomposition reaction <ul><li>paperclip = paper + clip </li></ul><ul><li>2 H 2 O  2 H 2 + O 2 </li></ul>
  10. 10. combination reaction <ul><li>when 2 or more substances combine to make a more complex substance </li></ul>
  11. 11. combination reaction <ul><li>bath + room = bathroom </li></ul><ul><li>2SO 2 + O 2 + 2H 2 0  2H 2 SO 4 </li></ul>
  12. 13. replacement <ul><li>1 element replaces another in a compound or 2 elements in compounds switch places </li></ul>
  13. 14. replacement <ul><li>television screen + door knob= </li></ul><ul><li>television knob + screen door </li></ul><ul><li>Mg + 2 H 2 O  Mg(OH) 2 + H 2 </li></ul>
  14. 15. Foam machine experiment
  15. 16. Foam Cup Meltdown

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