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# 11 13 What Is A Chemical Equation

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### 11 13 What Is A Chemical Equation

1. 1. Launch: 11/13   Grab your binder and immediately take a seat! 1.  How many of each atom are in the following molecules: i.  Br2 ii.  H2S iii. CCl4 iv.  H2SO4 v.  C6H12O6
2. 2. Announcements   Binder checks are worth a decent number of points!   It is really important that you   Do your launches   Finish your homework (and get a stamp)   Make-up all work from absences   lpschem.wordpress.com
3. 3. What are chemical equations? Mr. Heffner 11/13/09
4. 4. What are chemical equations?   A chemical equation is…   a representation of a chemical reaction 2H2 + O2  2H2O Reactants Products •  The substances that react •  The substances that •  Left are produced (made) •  Right
5. 5. What are chemical equations?   A chemical equation is…   a representation of a chemical reaction 2H2 + O2  2H2O Reaction Arrow •  “turns into” •  like an equals (=) sign
6. 6. What are chemical equations?   A chemical equation is…   a representation of a chemical reaction 2H2 + O2  2H2O Coefficients Subscripts •  Comes before the •  Comes after the atom compound •  Sub = below •  distributed to all
7. 7. Example 1.  How many H atoms does 2H2 have?   multiply the subscript and the coefficient   Coefficient = 2   Subscript = 2   2 X 2 = 4 hydrogen atoms
8. 8. Example 2.  How many H atoms does 2H2O have?   multiply the subscript and the coefficient   Coefficient = 2   Subscript = 2   2 X 2 = 4 hydrogen atoms
9. 9. Example 3.  How many O atoms does 2H2O have?   multiply the subscript and the coefficient   Coefficient = 2   Subscript = not there = 1   2 X 1 = 2 oxygen atoms
10. 10. Example 4.  How many O atoms does Mg(OH)2 have?   multiply the subscript and the coefficient   Coefficient = not there = 1   Subscript = 2   1 X 2 = 2 oxygen atoms
11. 11. Foldable   Make foldable and define terms. Draw an illustration if necessary. 1.  Chemical equation 2.  Reactants 3.  Products 4.  Coefficient 5.  Subscript 6.  Chemical reaction 7.  Chemical bond 8.  Molecule/compound
12. 12. Practice Question   Practice question handout
13. 13. Exit Slip 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.
14. 14. Exit Slip 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
15. 15. Exit Slip 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
16. 16. Exit Slip 4.  How many C atoms are there in 3C2H4? a.  2 b.  3 c.  5 d.  6
17. 17. Exit Slip 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
18. 18. Homework   Finish practice question worksheet