week 21 chemistry

Mole Conversions, Molar Mass, Percent Composition

Week 21 Chemistry

Warm Up: 4 Minutes

How many molecules are in 2.0 moles of Carbon Dioxide?

Write the Learning Target

You should be working SILENTLY

Stay in your own seat

Hint: 1 mole = _______ particles?

Agenda

Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 15 minutes Closing: 4 Minutes

Goal For Today

One Step Mole Calculations

2.0moles x6.02 x1023molecules

1mole=1.204 x1024molecules

Review of Types of Particles

Single Element

Covalent Compound

Ionic Compound

Atom

Molecules

Formula Unit

Conversion Factor of the Day

1mole=6.02 x 1023Particles (atoms ,molecules ,FormulaUnits)

1𝑚𝑜𝑙𝑒6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠

6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠1𝑚𝑜𝑙𝑒

How dowe know whichone¿ use?

Requirements of Mole Calculations

Identify the given quantity, unit, and element (or compound).

Identify the unknown quantity, unit, and element (or compound).

Identify the relationship(s) between the given unit and the unknown unit.

Example 1

How many atoms does 12.0 moles of He represent?

Example 2

How many moles does 1.1 x 1021 molecules of Carbon Dioxide (CO2) represent?

Example 3

How many formula units are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?

Guided Practice Expectations

As Mr. Ghosh projects the question, silently read the question. (17 seconds)

When Mr. Ghosh calls Team, discuss with your teammates to solve the question correctly. (81 seconds)

Be ready to share your response when Mr. Ghosh calls SWAG.

#1

How many molecules are in 0.723 moles of Dihydrogen Monoxide, H2O?

#2

How many moles are in 2.3 x 1025 formula units of Potassium Permanganate, KMnO4?

#3

How many manganese atoms are in 4.2 x 10-5 moles of Mn, manganese?

Independent Practice

Practice makes Perfect

85%

Closing

What relationships are necessary to perform mole calculations?

Warm Up: 4 Minutes

How many moles are in 6.42 x 1028 atoms of gold?

Write the Learning Target

You should be working SILENTLY

Stay in your own seat

No more than 4 people per row

Agenda

Warm Up: 7 Minutes Expectations for Stations: 4 minutes Stations Review: 40 minutes Closing: 2 Minutes

How Will Stations Work??

You will be placed with a group of other scholars to complete four stations on the following topics:

Station 1: Mole Calculations

Station 2: Writing Formulas

Station 3: Writing Names of Compounds

Station 4: Quantifying Atoms and Ions in Molecules and Formula Units

You Need: •Periodic Table•Notes

How Will Stations Work??

You will spend 10 minutes at each station working each problem as a group on scratch paper.

You will write your FINAL answer on the answer document.

When time is called, you will leave your current station and move on to the next station

You will have 10 seconds to move to the next station

Closing

Why did we review these concepts? Why is it important that everybody master

these objectives?

About your seats

Seats were chosen to help you focus and succeed in class Grades and behavior were factors

You must sit in your assigned seat every day If not, I will mark you absent

You may NEVER move the seats around. Seats are arranged to make sure everyone can see the board

Warm Up: 4 Minutes

How many molecules are in 2.0 moles of Carbon Dioxide (CO2)?

How many oxygen atoms are in one molecule of Carbon Dioxide (CO2)?

Write the Learning Target

You should be working SILENTLY

Stay in your own seat

Agenda

Seating Chart: 3 minutes Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 12 minutes Closing: 4 Minutes

The Warm-up…

So what if I asked you how many oxygen atoms were in 2 moles of Carbon Dioxide (CO2)?

How would you do it?

Question…

What is 2 x 3?

What is 6 x 4?

What is 2 x 3 x 4?

6

24

24

How did we do this?

Goal For Today

Multi Step Mole Calculations

2.0moles CO2 x6.02x 1023moleculesCO2

1moleC O2x2Oxygenatoms1moleculeC O2

=2.408 x1024 atoms

Relationships between particles

Covalent Compounds (Molecules) are made of atoms

Ionic Compounds (Formula Units) are made of ions

Example: CO2 3 atoms

Example: NO 2 atoms

Example: BaCl2 3 ions

Example: ZnSO4 2 ionsPolyatomic Ion

Reminder: Requirements of Mole Calculations

Identify the given quantity, unit, and element (or compound).

Identify the unknown quantity, unit, and element (or compound).

Identify the relationship(s) between the given unit and the unknown unit.

Moles

Formula Unit

(M + NM, Ionic)

Ions

Molecules

(NM + NM, Covalent)

Atoms

Atoms (single

element)

Example 1

How many atoms does 12.0 moles of Sulfur Dioxide (SO2) represent?

Example 2

How many hydroxide ions are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?

Guided Practice Expectations

As Mr. Ghosh projects the question, silently read the question. (17 seconds)

When Mr. Ghosh calls Team, discuss with your teammates to solve the question correctly. (81 seconds)

Be ready to share your response when Mr. Ghosh calls SWAG.

#1

How many ions are in 2.3 formula units of Potassium Permanganate, KMnO4?

#2

How many oxygen atoms are in 0.723 moles of Dihydrogen Monoxide, H2O?

#3

How many zinc ions are in 4.2 x 10-5 moles of Zinc Chloride (ZnCl2)?

Independent Practice

Practice makes Perfect

85%

Closing

What relationships are necessary to perform mole calculations?

Warm Up: 4 MinutesWrite the Learning

Target

You should be working SILENTLY

Stay in your own seat

Compound How many Aluminum atoms?

How many Sulfur atoms?

How many Oxygen atoms?

Al2(SO4)3Name Chemical Formula

Barium Nitrate

Triphosphorus Hexafluoride

Sodium Hydroxide

Agenda

Warm Up: 7 Minutes Notes/Examples: 13 minutes Guided Practice: 10 minutes Independent Practice: 13 minutes Closing: 2 Minutes

What is Molar Mass?

The mass (in grams) of one mole of the substance

Units for Molar Mass

g/mol

Read as “grams per mole”

How to find the Molar Mass of a Compound?

For the compound XaYbZc

Use this formula

Molar Mass = a(Atomic Mass X ) + b( Atomic Mass Y ) + c(Atomic Mass Z)

Example 1:

Calculate the Molar Mass of NaBr

Example 2:

Calculate the Molar Mass of C6H12O6.

Example 3:

Calculate the Molar Mass of

Al2(SO4)3

Expectations for Guided Practice

Take the first 13 seconds to write the chemical formula or name.

With your shoulder partner, take 61 seconds to find the molar mass.

When Mr. Ghosh calls SWAG, be ready to share your answers out loud.

Guided Practice #1

Calculate the Molar Mass of AgF2

145.864 g/ mol

Guided Practice #2

Calculate the Molar Mass of Calcium Nitrate.

Ca(NO3)2

164.086 g/ mol

Guided Practice #3

Calculate the Molar Mass of Tetracarbon Trioxide.

C4O3

96.041 g/mol

Independent Practice

Practice makes Perfect

85%

Answer Key

1. 70.906 g/ mol

2. 56.105 g/ mol

3. 79.918 g/ mol

4. 162.206 g/ mol

5. 67.804 g/ mol

6. 120.913 g/ mol

7. 58.319 g/ mol

8. 240.892 g/mol

9. 64.064 g/ mol

10. 97.994 g/ mol

11. 132.14 g/ mol

12. 60.052 g/ mol

13. 331.208 g/ mol

14. 379.629 g/ mol

Closing

In terms of a percentage, does the molar mass represent the part or the whole?