1. Launch: 12/15
 Grab your binder and immediately take a seat!
 Place HW (Review Worksheet #1), binder paper, and a
pen/pencil on your desk.
Review Objective #2:
Tonight’s HW: Finish Review Worksheet #2

2. Launch 12/15
4. Which of the following is a balanced equation for
the combustion of ethanol (C2H5OH)?
a. C2H5OH + 3O2  CO2 + 2H2O
b. C2H5OH + 3O2  2CO2 + 3H2O
c. C2H5OH + O2  2CO2 + 3H2O
d. C2H5OH + 2O2  3CO2 + 2H2O

3. Launch 12/15
__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

4. Launch 12/15
4. Which of the following is a balanced equation for
the combustion of ethanol (C2H5OH)?
a. C2H5OH + 3O2  CO2 + 2H2O
b. C2H5OH + 3O2  2CO2 + 3H2O
c. C2H5OH + O2  2CO2 + 3H2O
d. C2H5OH + 2O2  3CO2 + 2H2O

5. Launch 12/15
__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

6. Announcements
 Unit #5 Exam on Thursday
 Last day to review
 One side of a 3 X 5 notecard
 Make-up work is due today
 Binder check on Friday
 lpschem.wordpress.com

7. 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

8. Review:
The Mole – Part II
Mr. Heffner
12/16/09

9. Conversions
? grams 6.02 X 1023 atoms
1 mole 1 mole
? moles
Grams ? moles Moles Atoms
1 mole 1 mole
? grams 6.02 X 1023 atoms

10. Conversions
 There is a 3-step process for conversions:
1. Write down the starting information and look at the ending
information.
2. Using the “Heart of Chemistry”, pick the correct conversion
number “How many…”
factor(s).
3. Cancel like terms and do the math!

11. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #1: Write down the starting information and look at the
ending information.
4.04g H2

12. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
4.04g H2 X

13. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
molar mass

14. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
1 mol H2
4.04g H2 X X
2.02g H2

15. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
mole ratio

16. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
1 mol H2 1 mol O2
4.04g H2 X X X
2.02g H2 2 mol H2

17. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
molar mass

18. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #2: Pick the correct conversion factor(s).
1 mol H2 1 mol O2 32.00g O2
4.04g H2 X X X =
2.02g H2 2 mol H2 1 mol O2

19. Example #1
2H2 + O2  2H2O
In the equation above, how many grams of O2 are required to
completely react with 4.04 grams of H2?
 Step #3: Cancel like terms and do the math!
1 mol H2 1 mol O2 32.00g O2
4.04g H2 X X X =
2.02g H2 2 mol H2 1 mol O2
4 X 1 X 1 X 32 g O2
=
2X2X1
4 X 32 g O2
~ 32 g O2 = =
4

20. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #1: Write down the starting information and look at the
ending information.
54.06g H2O

21. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
54.06g H2O X

22. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
molar mass

23. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
1 mol H2O
54.06g H2O X X
18.02g H2O

24. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
mole ratio

25. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
1 mol H2O 1 mol H2
54.06g H2O X X X
18.02g H2O 2 mol H2O

26. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
? grams 6.02 X 1023 atoms
1 mole 1 mole
End
? moles
Grams ? moles Moles Atoms
Start 1 mole 1 mole
? grams 6.02 X 1023 atoms
molar mass

27. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #2: Pick the correct conversion factor(s).
1 mol H2O 1 mol H2 2.02g H2
54.06g H2O X X X =
18.02g H2O 2 mol H2O 1 mol H2

28. Example #2
2Na + 2H2O  2NaOH + H2
If 54.06 grams of water (H2O) are mixed with excess sodium,
then how many grams of hydrogen gas (H2) are produced?
 Step #3: Cancel like terms and do the math!
1 mol H2O 1 mol H2 2.02g H2
54.06g H2O X X X =
18.02g H2O 2 mol H2O 1 mol H2
54 X 1 X 1 X 2g H2
=
18 X 2 X 1
54 g H2
~ 3g H2 = =
18

29. Whiteboards
 Work in pairs
 Trade-off marker every question
 Partner without the marker should be checking
work at each step!
 You have 60 seconds to solve the question
 Show all of your work!
 Don’t forget units!
 Lift board only when prompted

30. How many grams of H2O
would be produced from
reacting 64.00g of O2?
2H2 + O2  2H2O

31. How many grams of O2 would
be required to completely
react with 6.06g of H2?
2H2 + O2  2H2O

32. If 64.00 grams of O2 are
reacted, how many grams of
water (H2O) are produced?
2H2 + O2  2H2O

33. If 1.01 grams of H2 are
reacted, how many grams of
water (H2O) are produced?
2H2 + O2  2H2O

34. Exit Slip
1. Choose the correct conversion factor(s):
How many moles are there in 24.02 grams of
carbon (C)?
12.01g 6.02 X 1023 atoms 1 mole
1 mole 1 mole 12.01g
I II III
a. I only
b. II only
c. III only
d. I and II

35. Exit Slip
2. Choose the correct conversion factor(s):
How many atoms are there in 3 moles of CH4?
16.05g 6.02 X 1023 atoms 1 mole
1 mole 1 mole 16.05g
I II III
a. I only
b. II only
c. III only
d. II and III

36. Exit Slip
3. Choose the correct conversion factor(s):
How many grams of CH4 are there in 9.03 X 1023
atoms?
16.05g 6.02 X 1023 atoms 1 mole
1 mole 1 mole 6.02 X 1023 atoms
I II III
a. I only
b. II only
c. II and III
d. I and III

37. Exit Slip
4. Choose the correct conversion factor(s):
How many grams of H2O would be produced
from 64.00 grams of O2?
2 mole H2O 18.02 grams H2O 1 mole O2
1 mole O2 1 mole H2O 32.00 grams O2
I II III
a. I only
b. II only
c. II and III
d. I, II, and III

38. Exit Slip
1 mol C
a. 12g C X 12.00g C
1 mol C 44.01g CO2
b. 24g C X X
12.00g C 1 mol CO2
2 mol C 1 mol CO2 44.01g CO2
c. 24g C X X X
12.00g C 2 mol C 1 mol CO2
1 mol C 1 mol CO2 44.01g CO2
d. 24g C X X X
12.00g C 1 mol C 1 mol CO2

39. Homework
 Finish practice questions worksheet