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Chemical Reactions Quiz Preparation

Chemical Reactions Quiz Preparation. Chemical Reactions rearrange atoms to form new molecules . No atoms ( lego ) are created or destroyed, they only get rearranged. . Chemical Reactions rearrange atoms to form new molecules.

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Chemical Reactions Quiz Preparation

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  1. Chemical Reactions Quiz Preparation

  2. Chemical Reactions rearrange atoms to form new molecules. No atoms (lego) are created or destroyed, they only get rearranged.

  3. Chemical Reactions rearrange atoms to form new molecules. Reactants: the molecules you began with. (the moleculesthat reacted together) Products: the molecules you end up with. (the molecules that are produced) reactants products

  4. Law of conservation of matter: Atoms are never created or destroyed in chemical reactions. (they just get rearranged into new molecules). IOW: (in other words) The number of atoms on the products side of a reactions will be exactly the same as the number of atoms found on the reactants side of the reaction.

  5. Carbon dioxide Water Carbonic Acid CO2+ H2O  H2CO3 ----------Reactants---------------- ---Products--- C O O + H H O  H H C O O 6 atoms (the Reactant side) 6 atoms (product side) This reaction has obeyed the Law of Conservation of matter. LOCOM

  6. All the equations we use will be correctly balanced and obey the LOCOM O2 + 2H2 H2O + H2O These large numbers represent the number of molecules on this side of the reaction. These small numbers represent the number of atoms in the molecule. Rewritten to show all atoms OO + HH HH HHO HHO

  7. O2 + 2H2 2H2O 2 Hydrogen molecules 2 water molecules 1 oxygen molecule Rewritten to show all molecules separately: O2 + H2 + H2 H2O + H2O Rewritten to show all atoms: OO + HH HH HHO HHO

  8. 2C2H6 + 7O2  4CO2 + 6H2O How many reactant molecules are there? 9 molecules How many product molecules are there? 10 molecules Did this reaction obey the LOCOM ? Yes it did, since it is the atoms (not the molecules) that must be the same on both sides.

  9. 2C2H6 + 7O2  4CO2 + 6H2O Rewritten to show all molecules: C2H6C2H6 + O2O2O2O2O2O2O2 CO2 CO2CO2CO2+ H2O H2OH2OH2OH2OH2O Rewritten to show all atoms: CCHHHHHHCCHHHHHH + OO OOOOOOOOOOOO COO COOCOOCOO + HHO HHOHHOHHOHHOHHO

  10. 6CO2 + 6H2O  C6H12O6 + 6O2 How many reactant molecules? How many product molecules? 12 molecules 7 molecules Rewritten to show all molecules: CO2 CO2CO2CO2CO2CO2+ H2O H2OH2OH2OH2OH2O C6H12O6 + O2O2O2O2O2O2 Rewritten to show all atoms: COO COOCOOCOOCOOCOO + HHO HHOHHOHHOHHOHHO  CCCCCCHHHHHHHHHHHHOOOOOO + OO OOOOOOOOOO The same number of atoms are always on both sides =LOCOM

  11. Chemical equations handout. And then the chemical equations QUIZ.

  12. 1 3

  13. 2

  14. 6

  15. 6

  16. 1 16 1 18

  17. 1 1 16 16 1 1 36

  18. Now try part 2

  19. 7

  20. 6

  21. 18 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O H H O H HO

  22. 18 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O H H O H HO

  23. 26 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O H H O H HO 12 12 1 1

  24. 44 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O 12 16 16 H H O H HO

  25. 212 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O 12 16 16 H H O H HO 1 1 16 12 12 1 1 12 16 16 1 1 16 12 16 16 12 16 16

  26. 212 O O O O O O O O O O C C H H C C H H C O O C O O C O O C O O 16 16 12 12 1 1 H H O H HO 16 16 12 12 1 1 16 16 16 16 16 16

  27. atoms molecule molecules reaction

  28. One last chance to review

  29. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many product molecules are there?

  30. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many product molecules are there? 10

  31. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many reactant atoms are there?

  32. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many reactant atoms are there? CCHHHHHH CCHHHHHH OO OO OO OO OO OO OO 30 Each letter is an atom.

  33. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many oxygen atoms are in the products?

  34. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water How many oxygen atoms are in the products? COO COO COO COO HHO HHO HHO HHO HHO HHO 14 Only count the “O” (oxygen) atoms

  35. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of 1 ethane molecule?

  36. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of 1 ethane molecule? 30 C C H HHHHH 12 +12 + 1 + 1 + 1 + 1 + 1 + 1 = 30

  37. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of all the ethane?

  38. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of all the ethane? C C H HHHHH = 30 12 12 1 1 1 1 1 1 C C H HHHHH = 30 12 12 1 1 1 1 1 1 Total = 60

  39. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of all the products?

  40. 2C2H6 + 7O2  4CO2 + 6H2O ethane oxygen carbon dioxide water What is the mass of all the products? 12+16+16 12+16+16 12+16+16 12+16+16 1+1+16 1+1+16 1+1+16 1+1+16 1+1+16 1+1+16 COO COO COO COO HHO HHO HHO HHO HHO HHO 284

  41. Now you can go and retake the quiz with Mr. Gillam during lunch.

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