balancing equations #1. 2013
TRANSCRIPT
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You Will Need:1. Counting Total Atoms– 2 pages
4 sides – Due NOW2. Log #4 (Update on-line) 3. Pencil, Periodic Table (pgs. 196-
197), Colored Pencils5. Balancing Equations - 2 pages 4
sides (Bookshelf- Please Staple)6. Today is the End of Quarter #3
…last day to turn in any work for this period of time.
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Last Day to:1.Retake Test #22.Retake Quiz #1 – STAR Cards
1-303.Turn in any missing work for
this quarter
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Balancing a chemical equations is much like the work of an accountant who has to show where every penny has come from and where it has gone to.
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Vocabulary Word
Definition
Inhibitors
Catalysts Starts and/or Speeds Up Chemical Reactions
Stops and/or Slows Down Chemical Reactions
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Conservation of Mass
Reactants
Products
Coefficient
Mass (particles) can neither be created or destroyed in any chemical reaction
Word Definition
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2 NaOH + H2SO4 Na2SO4 + 2 H2O
Conservation of Mass = the same number of atoms of each element on each side of the equation.
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Conservation of Mass
Reactants
Products
Coefficient
Mass can neither be created or destroyed in any chemical reaction.
Substances going into the reaction.
Word Definition
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Reactants = the substances going into a reaction
2 NaOH + H2SO4 Na2SO4 + 2 H2O
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Conservation of Mass
Reactants
Products
Coefficient
Mass can neither be created or destroyed in any chemical reaction.
Substances going into the reaction.
Substances produced by the reaction
Word Definition
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Products = the substances being produced by the reaction
2 NaOH + H2SO4 Na2SO4 + 2 H2O
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Conservation of Mass
Reactants
Products
Coefficient
Mass can neither be created or destroyed in any chemical reaction.
Substances going into the reaction.
Substances produced by the reaction
The number in front of the formula indicating how many molecules
Word Definition
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Coefficient = The number in front of each formula or element indicating how many molecules
2 NaOH + H2SO4 Na2SO4 + 2 H2O
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The Law of Conservation of Mass states that mass is neither created or destroyed in any chemical reaction.
Therefore balancing of equations requires the same number of atoms on both sides of a chemical reaction.
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1. Get Yourself an unbalanced equation.
NaOH + H2SO4 Na2SO4 + H2O
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1. Get Yourself an unbalanced equation.
2. Draw boxes around all the chemical formulas.
NaOH + H2SO4 Na2SO4 + H2O
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3. Make an element inventory.
Element Before After
Na=Sodium 1 2
O= Oxygen 5 5
H= Hydrogen 3 2
S= Sulfur 1 1
NaOH + H2SO4 Na2SO4 + H2O
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4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Sodium 1 2
Oxygen 5 5
Hydrogen 3 2
Sulfur 1 1
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4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 1 2
O 5 5
H 3 2
S 1 1
2
2
6
4
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4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 2 2
O 6 5
H 4 2
S 1 1
2
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4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.
NaOH + H2SO4 Na2SO4 + H2O
Element Before After
Na 2 2
O 6 5
H 4 2
S 1 1
2 2
6
4
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•You have 10 problems to balance… Due Tomorrow
•# 6 on the last page – Start with the (SCN)3 components
•Do TWO and get them checked before you complete them all.
•Ask questions when you don’t understand
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HOMEWORK:1. Balancing Equations – Due
Tomorrow
2. STAR CARDS #31-60 – Due Friday
3. Check your updated grades for accuracy ….Last day of the Quarter is Today.