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Launch: 12/14
  Grab your binder and immediately take a seat!
  Place binder paper and a pen/pencil on your desk.


Review Objective #1: I can write balanced chemical
  equations.
Tonight’s HW: Finish Review Worksheet #1
Launch 12/14
Launch 12/14
16. How many grams does 2 moles of soda niter
   NaNO3 weigh?
  a.  17g
  b.  85g
  c.  170g
  d.  1700g
Launch Answers
Launch Answers
16. How many grams does 2 moles of soda niter
   NaNO3 weigh?
  a.  17g
  b.  85g
  c.  170g
  d.  1700g
Practice Exam Results: B1
  Our goal = 80%
  Our average = 86%
  Questions dropped
    5, 6, 7, 9, 14
Practice Exam Results: B1
  Our goal = 80%
  Our average = 78%
  Questions dropped
    5, 6, 7, 9, 14
Practice Exam Results: B1
  Our goal = 80%
  Our average = 87%
  Questions dropped
    5, 6, 7, 9, 14
Practice Exam Results: B1
  Our goal = 80%
  Our average = 88%
  Questions dropped
    5, 6, 7, 9, 14
Announcements
  Unit #5 Exam on Thursday
    3 days to review
    Ask questions!
    No copying HW or classwork!
  Make-up work is due on Wednesday
  Binder check this week
Exam Information
  30 multiple-choice questions
    Balancing equations (6 questions = 20%)
    The mole (9 questions = 30%)
    Conversions (15 questions = 50%)
      gram  mole (6 questions)
      gram  atoms (3 questions)
      gram  gram (6 questions)

  3 free response
Review:
Balancing Equations
       Mr. Heffner
       12/14/09
What’s a chemical equation?



  CH4 + 2O2  CO2 + 2H2O

Reactants                 Products
            “turn into”
What’s a chemical equation?


                 4Fe2(CO3)3
   Coefficient
  Multiply!         Subscript
    8 X Fe
    12 X C
    36 X O
How are equations balanced?
  There is a 3-step process for balancing
  equations:
1.  Count the atoms on both sides
2.  Change a coefficient & multiply out
3.  Check tally (and repeat)


     Rule: You can’t change the subscripts!
Example
  Balance the equation,

             N2 + H2  NH3
Example
  Step #1: Count the atoms on both sides

              N2 + H2  NH3
            2XN       2XH         1XN
                                  3XH


                  Unbalanced!
Example
  Step #2: Change coefficient & multiply out

              N2 + H2  NH3
                       2
             2XN       2XH
                                 (
                                 1XN
                              2X 3 X H    )
                                     2XN
                                     6XH
Example
  Step #3: Check tally (and repeat)

              N2 + H2  NH3
                  3    2
                      ( )
           2 X N 3X 2 X H              2XN
                                       6XH
                       6XH

          Still unbalanced!
Example
  Step #3: Check tally (and repeat)

              N2 +3H2  NH3
                       2
             2XN       6XH             2XN
                                       6XH


                   Balanced!
Snowman Challenge
  Directions:
      Send one group member to pick a card
      Write down the equation and #
      Balance it showing all work (count, coefficient, check)
      When finished, send one group member to have me
       check your answer

  Rules:
      If you pick it, solve it
      Only one card at a time
      Show your work!
      Work together
Exit Slip
  HC2H3O2 + NaHCO3  NaC2H3O2 + H2CO3
1.  Which of the following correctly identifies all of
   the reactants in the above chemical equation.
  a.  NaC2H3O2
  b.  NaHCO3
  c.  NaC2H3O2 and HC2H3O2
  d.  HC2H3O2 and NaHCO3
Exit Slip
2.  How many C atoms are there in 3C2H4?
  a.    2
  b.    3
  c.    5
  d.    6
Exit Slip
                  H2 + Cl2  HCl
3.  Is the above equation balanced?
  a.  No, because H2 has a coefficient of 2.
  b.  No, because the number of Cl and H atoms are not
      equal on both sides of the equation.
  c.  Yes, because the number of H atoms is not equal on
      both sides.
  d.  Yes, because there are equal numbers of atoms on
      both sides of the equation.
Exit Slip
4.  Which of the following is a balanced equation for
   the combustion of ethanol (C2H6O)?
  a.  C2H5OH + 3O2  CO2 + 2H2O
  b.  C2H5OH + 3O2  2CO2 + 3H2O
  c.  C2H5OH + O2  2CO2 + 3H2O
  d.  C2H5OH + 2O2  3CO2 + 2H2O
Exit Slip
               __C2H2 + __H2  __CH4

5.  When the equation above is completely balanced,
   the coefficient for H2 would be
  a.  1
  b.  2
  c.  3
  d.  4
Homework
  Finish practice questions worksheet

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12 14 Balancing Review

  • 1. Launch: 12/14   Grab your binder and immediately take a seat!   Place binder paper and a pen/pencil on your desk. Review Objective #1: I can write balanced chemical equations. Tonight’s HW: Finish Review Worksheet #1
  • 3. Launch 12/14 16. How many grams does 2 moles of soda niter NaNO3 weigh? a.  17g b.  85g c.  170g d.  1700g
  • 5. Launch Answers 16. How many grams does 2 moles of soda niter NaNO3 weigh? a.  17g b.  85g c.  170g d.  1700g
  • 6. Practice Exam Results: B1   Our goal = 80%   Our average = 86%   Questions dropped   5, 6, 7, 9, 14
  • 7. Practice Exam Results: B1   Our goal = 80%   Our average = 78%   Questions dropped   5, 6, 7, 9, 14
  • 8. Practice Exam Results: B1   Our goal = 80%   Our average = 87%   Questions dropped   5, 6, 7, 9, 14
  • 9. Practice Exam Results: B1   Our goal = 80%   Our average = 88%   Questions dropped   5, 6, 7, 9, 14
  • 10. Announcements   Unit #5 Exam on Thursday   3 days to review   Ask questions!   No copying HW or classwork!   Make-up work is due on Wednesday   Binder check this week
  • 11. Exam Information   30 multiple-choice questions   Balancing equations (6 questions = 20%)   The mole (9 questions = 30%)   Conversions (15 questions = 50%)   gram  mole (6 questions)   gram  atoms (3 questions)   gram  gram (6 questions)   3 free response
  • 12. Review: Balancing Equations Mr. Heffner 12/14/09
  • 13.
  • 14. What’s a chemical equation? CH4 + 2O2  CO2 + 2H2O Reactants Products “turn into”
  • 15. What’s a chemical equation? 4Fe2(CO3)3 Coefficient   Multiply! Subscript   8 X Fe   12 X C   36 X O
  • 16. How are equations balanced?   There is a 3-step process for balancing equations: 1.  Count the atoms on both sides 2.  Change a coefficient & multiply out 3.  Check tally (and repeat) Rule: You can’t change the subscripts!
  • 17. Example   Balance the equation, N2 + H2  NH3
  • 18. Example   Step #1: Count the atoms on both sides N2 + H2  NH3 2XN 2XH 1XN 3XH Unbalanced!
  • 19. Example   Step #2: Change coefficient & multiply out N2 + H2  NH3 2 2XN 2XH ( 1XN 2X 3 X H ) 2XN 6XH
  • 20. Example   Step #3: Check tally (and repeat) N2 + H2  NH3 3 2 ( ) 2 X N 3X 2 X H 2XN 6XH 6XH Still unbalanced!
  • 21. Example   Step #3: Check tally (and repeat) N2 +3H2  NH3 2 2XN 6XH 2XN 6XH Balanced!
  • 22. Snowman Challenge   Directions:   Send one group member to pick a card   Write down the equation and #   Balance it showing all work (count, coefficient, check)   When finished, send one group member to have me check your answer   Rules:   If you pick it, solve it   Only one card at a time   Show your work!   Work together
  • 23. Exit Slip HC2H3O2 + NaHCO3  NaC2H3O2 + H2CO3 1.  Which of the following correctly identifies all of the reactants in the above chemical equation. a.  NaC2H3O2 b.  NaHCO3 c.  NaC2H3O2 and HC2H3O2 d.  HC2H3O2 and NaHCO3
  • 24. Exit Slip 2.  How many C atoms are there in 3C2H4? a.  2 b.  3 c.  5 d.  6
  • 25. Exit Slip H2 + Cl2  HCl 3.  Is the above equation balanced? a.  No, because H2 has a coefficient of 2. b.  No, because the number of Cl and H atoms are not equal on both sides of the equation. c.  Yes, because the number of H atoms is not equal on both sides. d.  Yes, because there are equal numbers of atoms on both sides of the equation.
  • 26. Exit Slip 4.  Which of the following is a balanced equation for the combustion of ethanol (C2H6O)? a.  C2H5OH + 3O2  CO2 + 2H2O b.  C2H5OH + 3O2  2CO2 + 3H2O c.  C2H5OH + O2  2CO2 + 3H2O d.  C2H5OH + 2O2  3CO2 + 2H2O
  • 27. Exit Slip __C2H2 + __H2  __CH4 5.  When the equation above is completely balanced, the coefficient for H2 would be a.  1 b.  2 c.  3 d.  4
  • 28. Homework   Finish practice questions worksheet