Download - 12 14 Balancing Review
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Launch: 12/14 Grab your binder and immediately take a seat!
Place binder paper and a pen/pencil on your desk.
Review Objective #1: I can write balanced chemical equations.
Tonight’s HW: Finish Review Worksheet #1
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Launch 12/14
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Launch 12/14 16. How many grams does 2 moles of soda niter
NaNO3 weigh? a. 17g b. 85g c. 170g
d. 1700g
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Launch Answers
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Launch Answers 16. How many grams does 2 moles of soda niter
NaNO3 weigh? a. 17g b. 85g c. 170g
d. 1700g
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Practice Exam Results: B1 Our goal = 80%
Our average = 86%
Questions dropped 5, 6, 7, 9, 14
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Practice Exam Results: B1 Our goal = 80%
Our average = 78%
Questions dropped 5, 6, 7, 9, 14
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Practice Exam Results: B1 Our goal = 80%
Our average = 87%
Questions dropped 5, 6, 7, 9, 14
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Practice Exam Results: B1 Our goal = 80%
Our average = 88%
Questions dropped 5, 6, 7, 9, 14
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Announcements Unit #5 Exam on Thursday
3 days to review Ask questions!
No copying HW or classwork!
Make-up work is due on Wednesday
Binder check this week
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Exam Information 30 multiple-choice questions
Balancing equations (6 questions = 20%) The mole (9 questions = 30%)
Conversions (15 questions = 50%) gram mole (6 questions)
gram atoms (3 questions)
gram gram (6 questions)
3 free response
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Review: Balancing Equations
Mr. Heffner 12/14/09
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CH4 + 2O2 CO2 + 2H2O
What’s a chemical equation?
Reactants Products “turn into”
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What’s a chemical equation?
4Fe2(CO3)3
Multiply! 8 X Fe
12 X C 36 X O
Coefficient Subscript
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How are equations balanced? There is a 3-step process for balancing
equations:
1. Count the atoms on both sides
2. Change a coefficient & multiply out
3. Check tally (and repeat)
Rule: You can’t change the subscripts!
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Example Balance the equation,
N2 + H2 NH3
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Step #1: Count the atoms on both sides
N2 + H2 NH3
Example
2 X N 2 X H 1 X N 3 X H
Unbalanced!
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Step #2: Change coefficient & multiply out
N2 + H2 NH3
Example
2 X N 2 X H 1 X N 3 X H
2
2 X N 6 X H
2X( )
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Step #3: Check tally (and repeat)
N2 + H2 NH3
Example
2 X N 2 X H
2
2 X N 6 X H
3
6 X H
Still unbalanced!
3X( )
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Step #3: Check tally (and repeat)
N2 + H2 NH3
Example
6 X H
2
2 X N 6 X H
3
2 X N
Balanced!
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Snowman Challenge Directions:
Send one group member to pick a card Write down the equation and #
Balance it showing all work (count, coefficient, check) When finished, send one group member to have me
check your answer
Rules: If you pick it, solve it Only one card at a time Show your work!
Work together
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Exit Slip HC2H3O2 + NaHCO3 NaC2H3O2 + H2CO3
1. 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
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Exit Slip 2. How many C atoms are there in 3C2H4?
a. 2 b. 3
c. 5 d. 6
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Exit Slip H2 + Cl2 HCl
3. Is the above equation balanced? a. No, because H2 has a coefficient of 2.
b. No, because the number of Cl and H atoms are not equal on both sides of the equation.
c. Yes, because the number of H atoms is not equal on both sides.
d. Yes, because there are equal numbers of atoms on both sides of the equation.
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Exit Slip 4. Which of the following is a balanced equation for
the combustion of ethanol (C2H6O)? a. C2H5OH + 3O2 CO2 + 2H2O b. C2H5OH + 3O2 2CO2 + 3H2O c. C2H5OH + O2 2CO2 + 3H2O
d. C2H5OH + 2O2 3CO2 + 2H2O
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Exit Slip __C2H2 + __H2 __CH4
5. When the equation above is completely balanced, the coefficient for H2 would be
a. 1
b. 2
c. 3
d. 4
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Homework Finish practice questions worksheet