12 16 Mole Review Part Ii

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

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

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

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

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

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

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

Review: The Mole – Part II

Mr. Heffner 12/16/09

Conversions

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

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 factor(s).

3.  Cancel like terms and do the math!

number “How many…”

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

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).

Example #1

4.04g H2 X

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).

Example #1

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

molar mass

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 2.02g H2

Example #1

4.04g H2 X X

Example #1

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

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).

mole ratio

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 2.02g H2

Example #1

4.04g H2 X mol O2 mol H2

X X1 2

Example #1

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

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).

molar mass

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 2.02g H2

Example #1

4.04g H2 X =1 mol O2 2 mol H2

X32.00g O2 1 mol O2

X

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 2.02g H2

Example #1

4.04g H2 X =1 mol O2 2 mol H2

X32.00g O2 1 mol O2

X

=4 X 1 X 1 X 32 g O2 2 X 2 X 1

=4 X 32 g O2 4

~ 32 g O2 =

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

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).

Example #2

54.06g H2O X

Example #2

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

molar mass

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).

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 18.02g H2O

Example #2

54.06g H2O X X

Example #2

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

mole ratio

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).

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 18.02g H2O

Example #2

54.06g H2O X mol H2 mol H2O

X X1

2

Example #2

Moles Grams Atoms

? grams 1 mole

1 mole ? grams

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

? moles ? moles

Start

End

molar mass

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).

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 18.02g H2O

Example #2

54.06g H2O X =1 mol H2 2 mol H2O

X2.02g H2 1 mol H2

X

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 18.02g H2O

Example #2

54.06g H2O X =1 mol H2 2 mol H2O

X2.02g H2 1 mol H2

X

=54 X 1 X 1 X 2g H2 18 X 2 X 1

=54 g H2 18

~ 3g H2 =

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

How many grams of H2O would be produced from reacting 64.00g of O2?

2H2 + O2 2H2O

How many grams of O2 would be required to completely

react with 6.06g of H2?

2H2 + O2 2H2O

If 64.00 grams of O2 are reacted, how many grams of

water (H2O) are produced?

2H2 + O2 2H2O

If 1.01 grams of H2 are reacted, how many grams of

water (H2O) are produced?

2H2 + O2 2H2O

Exit Slip

1. Choose the correct conversion factor(s):

How many moles are there in 24.02 grams of carbon (C)?

I II III a.  I only b.  II only

c.  III only d.  I and II

1 mole 12.01g

12.01g 1 mole

6.02 X 1023 atoms 1 mole

Exit Slip

2.  Choose the correct conversion factor(s):

How many atoms are there in 3 moles of CH4?

I II III a.  I only

b.  II only c.  III only d.  II and III

1 mole 16.05g

16.05g 1 mole

6.02 X 1023 atoms 1 mole

Exit Slip

3.  Choose the correct conversion factor(s):

How many grams of CH4 are there in 9.03 X 1023 atoms?

I II III a.  I only b.  II only

c.  II and III d.  I and III

16.05g 1 mole

6.02 X 1023 atoms 1 mole

1 mole 6.02 X 1023 atoms

Exit Slip

4.  Choose the correct conversion factor(s):

How many grams of H2O would be produced from 64.00 grams of O2?

I II III a.  I only b.  II only

c.  II and III d.  I, II, and III

2 mole H2O 1 mole O2

18.02 grams H2O 1 mole H2O

1 mole O2 32.00 grams O2

Exit Slip

a.  12g C X

b.  24g C X X

c.  24g C X X X

d.  24g C X X X

1 mol C 12.00g C 1 mol C

12.00g C 44.01g CO2 1 mol CO2

2 mol C 12.00g C

1 mol CO2 2 mol C

44.01g CO2 1 mol CO2

1 mol C 12.00g C

1 mol CO2 1 mol C

44.01g CO2 1 mol CO2

Homework   Finish practice questions worksheet