Launch: 11/16
  Grab your binder and immediately take a seat!
  Place homework (practice questions) on desk.
           ...
Launch 11/16
5.  Which of the following identifies the correct
   number of atoms in 3H2SO4?
  a.  3 H atoms, 3 S atoms, 3...
Launch: 11/16
  Grab your binder and immediately take a seat!
  Place homework (practice questions) on desk.
     HC2H3O...
Launch 11/16
5.  Which of the following identifies the correct
   number of atoms in 3H2SO4?
  a.  3 H atoms, 3 S atoms, 3...
Launch: 11/16
  Grab your binder and immediately take a seat!
  Place homework (practice questions) on desk.
  1.  What ...
Launch 11/16
  HC2H3O2 + NaHCO3  NaC2H3O2 + H2CO3
2.  Which of the following correctly identifies all of
   the reactants...
Announcements
  Unit #5: Chemical Reactions & Stoichiometry
  Class points end next week
    Get your HW done
    Be r...
Is the equation balanced?
          Mr. Heffner
          11/16/09
What is conservation of matter?
   The Principle of Conservation of Matter states…
     that, in a chemical reaction, at...
Is the equation balanced?
               Balanced: the # atoms
               is equal on both sides




               ...
Example #1
  Is the below equation balanced?
     Count the # of atoms on both sides

             2H2 + O2  2H2O
     ...
Whiteboards
  With a partner, determine whether or not the
   equations are balanced.
    First, re-write the equation o...
Practice Questions
  Practice question handouts
Exit Slip
1.  The “Principle of Conservation of Matter” states
   that
  a.  in a chemical equation, the number of atoms o...
Exit Slip
2.  Which of the following identifies the correct
   number of atoms in 2H3PO4?
  a.  2 H atoms, 3 P atoms, 4 O ...
Exit Slip
            Mg + 2H2O  Mg(OH)2 + 2H2
3.  Is the above equation balanced?
  a.    No, because the number of H at...
Exit Slip
4.  Hydrogen gas (H2) and oxygen gas (O2) react to
   form water (H2O). Which of these represents a
   properly ...
Exit Slip
5.  Which of the following is a balanced equation for
   the combustion of ethanol (C2H6O)?
  a.  C2H6O + 3O2  ...
Homework
  Finish practice question worksheet
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11 16 Is The Equation Balanced

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11 16 Is The Equation Balanced

  1. 1. Launch: 11/16   Grab your binder and immediately take a seat!   Place homework (practice questions) on desk. 4Na + 4H2O  4NaOH + 2H2 3.  Which of the following identifies the coefficient for H2O in the above chemical equation? a.  1 b.  2 c.  4 d.  8
  2. 2. Launch 11/16 5.  Which of the following identifies the correct number of atoms in 3H2SO4? a.  3 H atoms, 3 S atoms, 3 O atoms b.  2 H atoms, 1 S atom, 4 O atoms c.  6 H atoms, 3 S atoms, 4 O atoms d.  6 H atoms, 3 S atom, 12 O atoms
  3. 3. Launch: 11/16   Grab your binder and immediately take a seat!   Place homework (practice questions) on desk. HC2H3O2 + NaHCO3  NaC2H3O2 + H2CO3 2.  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
  4. 4. Launch 11/16 5.  Which of the following identifies the correct number of atoms in 3H2SO4? a.  3 H atoms, 3 S atoms, 3 O atoms b.  2 H atoms, 1 S atom, 4 O atoms c.  6 H atoms, 3 S atoms, 4 O atoms d.  6 H atoms, 3 S atom, 12 O atoms
  5. 5. Launch: 11/16   Grab your binder and immediately take a seat!   Place homework (practice questions) on desk. 1.  What are chemical equations? a.  Representations of chemical reactions in which the reactants are listed to the left of a reaction arrow. b.  Representations of chemical bonds in which 2 valence electrons are depicted by a straight line c.  Representations of chemical reactions in which the. products are listed to the left of the reaction arrow. d.  A way to show how reaction arrows turn into reactants.
  6. 6. Launch 11/16 HC2H3O2 + NaHCO3  NaC2H3O2 + H2CO3 2.  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
  7. 7. Announcements   Unit #5: Chemical Reactions & Stoichiometry   Class points end next week   Get your HW done   Be respectful   Quiz on Friday!
  8. 8. Is the equation balanced? Mr. Heffner 11/16/09
  9. 9. What is conservation of matter?   The Principle of Conservation of Matter states…   that, in a chemical reaction, atoms cannot be created or destroyed 2H2 + O2  2H2O The # of atoms on the reactants side = The # of atoms on the products side
  10. 10. Is the equation balanced?   Balanced: the # atoms is equal on both sides   Unbalanced: the # of atoms is not equal on both sides
  11. 11. Example #1   Is the below equation balanced?   Count the # of atoms on both sides 2H2 + O2  2H2O 4XH 2XO 4XH 2XO Multiply the coefficients and subscripts Yes, it is balanced!
  12. 12. Whiteboards   With a partner, determine whether or not the equations are balanced.   First, re-write the equation on your whiteboard.   Then, count the atoms on each sides showing all of your work!   Finally, raise your hand to show Mr. Heffner when you have completed the problem.   Do not go on to the next problem until you have been checked off!
  13. 13. Practice Questions   Practice question handouts
  14. 14. Exit Slip 1.  The “Principle of Conservation of Matter” states that a.  in a chemical equation, the number of atoms on the products side must equal then number of atoms on the reactants side. b.  both of the reactants need to have the same number of atoms. c.  both of the products need to have the same number of atoms. d.  in a chemical reaction, matter can be created or destroyed.
  15. 15. Exit Slip 2.  Which of the following identifies the correct number of atoms in 2H3PO4? a.  2 H atoms, 3 P atoms, 4 O atoms b.  6 H atoms, 2 P atom, 8 O atoms c.  6 H atoms, 3 P atoms, 4 O atoms d.  6 H atoms, 3 P atom, 12 O atoms
  16. 16. Exit Slip Mg + 2H2O  Mg(OH)2 + 2H2 3.  Is the above equation balanced? a.  No, because the number of H atoms is not equal b.  No, because the number of O atoms is not equal c.  Yes, because the number of Mg atoms is not equal d.  Yes, because there are equal numbers of atoms on both sides of the equation
  17. 17. Exit Slip 4.  Hydrogen gas (H2) and oxygen gas (O2) react to form water (H2O). Which of these represents a properly balanced equation for this reaction? a.  H2 + O2  H2O b.  2H2 + 2O2  2H2O c.  2H2 + O2  2H2O d.  H2 + 2O2  2H2O
  18. 18. Exit Slip 5.  Which of the following is a balanced equation for the combustion of ethanol (C2H6O)? a.  C2H6O + 3O2  CO2 + 2H2O b.  C2H6O + 3O2  2CO2 + 3H2O c.  C2H6O + O2  2CO2 + 3H2O d.  C2H6O + 2O2  3CO2 + 2H2O
  19. 19. Homework   Finish practice question worksheet

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