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Balancing Equations November , 2.009 *10 3

Balancing Equations November , 2.009 *10 3. Objective: SWBAT apply law of conservation of mass to chemical reactions by balancing! Catalyst: Name the reactants in this equation. Fe + AlOH 3  FeOH 2 _ + Al Name the products in this equation. 2H 2 + O 2  2H 2 O. Agenda.

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Balancing Equations November , 2.009 *10 3

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  1. Balancing EquationsNovember , 2.009 *103 • Objective: • SWBAT apply law of conservation of mass to chemical reactions by balancing! • Catalyst: • Name the reactants in this equation. • Fe + AlOH3 FeOH2 _+ Al • Name the products in this equation. • 2H2 + O2  2H2O

  2. Agenda • Catalyst • Go over test! • Balancing Equations • Practice • Exit Question

  3. Whiteboard Practice • How many atoms are in these compounds? • AlCl3 • H2O • H2O2 • KCl • Be3S2

  4. Balancing equations RULES! • Key Point #1: When balancing equations, Never, Never, NEVER change subscripts, only coefficients!

  5. Yo, Mr. Jhaveri • What is a coefficient? • GOOD QUESTION!

  6. Coefficient • A coefficient is a whole number comes in front of the compound, never in the middle! • You multiply the coefficient to all the numbers in the compound 2AlCl3

  7. Do you get it? • 3AlCl3 • How many atoms of each element do they have? • 3 Aluminum’s • 9 Chlorine’s

  8. Whiteboard Practice • 2AlCl3 • 4H2O • 6H2O2 • 5KCl • 2Be3S2

  9. Why is the top equation wrong? (5 minutes) – You figure it out • We never want to leave an equation written like this… • H2 + O2  H2O • We want to have it like this… • 2H2 + O2  2H2O • WHY???

  10. L-C-M!!! • Key Point #2: • Chemical reactions MUST follow the law of conservation of mass. • What was that LCM again? • If 3 carbons are in the reactants of a reaction, then there darn well better be 3 carbons in the products of a reaction.

  11. H2 + O2 H2O __H__ __O__ Write down elements. Balancing Chemical Reactions

  12. H2 + O2 H2O __H__ __O__ How many are there? Balancing Chemical Reactions

  13. H2 + O2 H2O _2_H_2_ __O__ How many are there? Balancing Chemical Reactions

  14. H2 + O2 H2O _2_H_2_ _2_O_1_ How many are there? Balancing Chemical Reactions

  15. Try These: N2 + H2  NH3 P4O10 + H2O  H3PO4 Ca3P2 + H2O  Ca(OH)2 + PH3 Balancing Chemical Reactions

  16. Try These: N2 + 3H2  2NH3 P4O10 + H2O  H3PO4 Ca3P2 + H2O  Ca(OH)2 + PH3 Balancing Chemical Reactions

  17. Try These: N2 + 3H2  2NH3 P4O10 + 6H2O  4H3PO4 Ca3P2 + H2O  Ca(OH)2 + PH3 Balancing Chemical Reactions

  18. Try These: N2 + 3H2  2NH3 P4O10 + 6H2O  4H3PO4 Ca3P2 + 6H2O  3Ca(OH)2 + 2PH3 Balancing Chemical Reactions

  19. Independent Practice • Worksheet!

  20. Exit Question • Balance the following equations: • KClO3 ---> KCl + O2 • S8 + O2 ---> SO3

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