Download - Balancing Equations November , 2.009 *10 3
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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
121
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Agenda
Catalyst Go over test! Balancing Equations Practice Exit Question
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Whiteboard Practice
How many atoms are in these compounds?
AlCl3 H2O H2O2
KCl Be3S2
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Balancing equations RULES!
Key Point #1: When balancing equations, Never, Never, NEVER change subscripts, only coefficients!
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Yo, Mr. Jhaveri
What is a coefficient?
GOOD QUESTION!
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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
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Do you get it?
3AlCl3
How many atoms of each element do they have?
3 Aluminum’s 9 Chlorine’s
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Whiteboard Practice
2AlCl3 4H2O 6H2O2
5KCl 2Be3S2
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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???
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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.
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Balancing Chemical Reactions
H2 + O2 H2O
__H____O__
Write down elements.
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Balancing Chemical Reactions
H2 + O2 H2O
__H____O__
How many are there?
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Balancing Chemical Reactions
H2 + O2 H2O
_2_H_2___O__
How many are there?
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Balancing Chemical Reactions
H2 + O2 H2O
_2_H_2__2_O_1_
How many are there?
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Balancing Chemical Reactions
Try These:N2 + H2 NH3
P4O10 + H2O H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3
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Balancing Chemical Reactions
Try These:N2 + 3H2 2NH3
P4O10 + H2O H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3
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Balancing Chemical Reactions
Try These:N2 + 3H2 2NH3
P4O10 + 6H2O 4H3PO4 Ca3P2 + H2O Ca(OH)2 + PH3
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Balancing Chemical Reactions
Try These:N2 + 3H2 2NH3
P4O10 + 6H2O 4H3PO4 Ca3P2 + 6H2O
3Ca(OH)2 + 2PH3
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Independent Practice
Worksheet!
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Exit Question
Balance the following equations:
KClO3 ---> KCl + O2
S8 + O2 ---> SO3