it’s time to learn about.... what's the difference between roast beef and pea soup? anyone...

It’s time to learn about . . .It’s time to learn about . . .

What's The Difference Between What's The Difference Between Roast Beef And Pea Soup?Roast Beef And Pea Soup?

Anyone Can Roast Beef.

StoichiometryStoichiometry

Stoichiometry : Mole Ratios to Stoichiometry : Mole Ratios to Determining Grams of ProductDetermining Grams of ProductAt the conclusion of our time At the conclusion of our time together, you should be able to:together, you should be able to:

1. Review the conversion of particles or grams to moles

2. Determine mole ratios from a balanced chemical equation

3. Determine the amount of product produced when given the amount of reactants

Review the Molar Mass of Review the Molar Mass of CompoundsCompounds

The molar mass (MM) of a compound is determined by adding up all the atomic masses for the molecule (or compound)

◦Ex. Molar mass of CaCl2◦Avg. Atomic mass of Calcium = 40.08g◦Avg. Atomic mass of Chlorine = 35.45g◦Molar Mass of calcium chloride =

40.08 g/mol Ca + (2 X 35.45) g/mol Cl 110.98 g/mol CaCl2

17Cl

35.45

20

Ca 40.08

My new book on GOLF will My new book on GOLF will give the reader valuable give the reader valuable playing tips and insider playing tips and insider information I've gained information I've gained through my years of through my years of lessons, struggles and lessons, struggles and experiments.experiments. Here are just a few of the Here are just a few of the chapter titles: chapter titles:

Chapter 5 - When to Give the Ranger the Middle Digit. Chapter 14 – The Best Time to Let a Foursome Play through Your Twosome.

CalculationsCalculations

molar mass Avogadro’s

number Grams MolesMoles

Particles

Everything must go through Moles!!!Everything must go through Moles!!!

FlowchartFlowchartAtoms or Molecules

Moles

Mass (grams)

Divide by 6.02 X 1023

Multiply by 6.02 X 1023 Multiply by

atomic/molar mass from periodic tableDivide by

atomic/molar mass from periodic table

Things my Mother taught me…

WEATHER.

"This room of yours looks as if a tornado went through it."

Chocolate Chip Cookies!!Chocolate Chip Cookies!!1 cup butter 2 eggs 1/2 cup white sugar 1

teaspoon salt 1 cup packed brown sugar 1 teaspoon vanilla extract 2 1/2 cups all-purpose flour 1 teaspoon baking soda 2 cups semisweet chocolate chipsMakes 3 dozenHow many eggs are needed to make 3 dozen cookies?

How much butter is needed to make 6 dozen cookies?

How many cookies could I make if I had plenty of everything but only had 1½ cups white sugar?

Cookies and Chemistry…Huh!?!?Cookies and Chemistry…Huh!?!?

Just like chocolate chip Just like chocolate chip cookies have recipes, cookies have recipes, chemists have recipes as wellchemists have recipes as well

Instead of calling them Instead of calling them recipes, we call them recipes, we call them chemical equationschemical equations

Furthermore, instead of using Furthermore, instead of using cups and teaspoons, we use cups and teaspoons, we use molesmoles

Lastly, instead of eggs, Lastly, instead of eggs, butter, sugar, etc. we use butter, sugar, etc. we use chemical compounds as chemical compounds as ingredientsingredients

Chemistry Recipes: #1 on Chemistry Recipes: #1 on Stoichiometry Stoichiometry between 2 Compoundsbetween 2 Compounds

Looking at a reaction tells us how much of something you need to react with something else to get a product (like the cookie recipe)

Be sure you have a balanced reaction before you start! Balance #1 on your worksheet!!

Example: 2 Ag + Cl2 2 AgCl This reaction tells us that by mixing 2

moles of silver with 1 mole of chlorine we will get 2 moles of silver chloride

What if we wanted 4 moles of AgCl? 10 moles? 5 moles?

Let’s sit down and figure this out!!

Mole RatiosMole Ratios

These mole ratios can be used to calculate the moles of one chemical from the given amount of a different chemical

Example: How many moles of chlorine are needed to react with 5 moles of silver (without any silver left over)?

2 Ag + Cl2 2 AgCl

5 Ag + 2.5 Cl2 5 AgCl

5 mol Ag

Question AnswerQuestion Answer

2 Ag+ Cl2 2 AgCl

# moles of Cl2 =

x 1 mol Cl22 mol Ag

= 2.5 mol Cl2

Mole-Mole ConversionsMole-Mole Conversions

2.5 moles of Cl2 would be how many grams?

2 Ag + Cl2 2 AgCl

2.5 mol Cl2 x 70.90 g Cl2 1 mol Cl2

= 177.25 g Cl2

Try #2Try #2

Molar Mass of Fe(OH)Molar Mass of Fe(OH)33 = 106.88 = 106.88 g/molg/mol

Now # 3…Now # 3…

Molar Mass of SiOMolar Mass of SiO22 = 60.09 g/mol = 60.09 g/mol

Another Why - Maxine

If lawyers are disbarred and clergymen defrocked, then doesn't it follow that electricians can be delighted, musicians denoted, cowboys deranged, models deposed, tree surgeons debarked, and dry cleaners depressed?

Stoichiometry : Mole Ratios to Stoichiometry : Mole Ratios to Determining Grams of ProductDetermining Grams of ProductLet’s see if you can:Let’s see if you can:

1. Review the conversion of particles or grams to moles

2. Determine mole ratios from a balanced chemical equation


Start your HomeLearning NOW!!

Stoichiometry Continued:Stoichiometry Continued:

Stoichiometry : Mole Ratios to Stoichiometry : Mole Ratios to Determining Grams of ProductDetermining Grams of ProductAt the conclusion of our time At the conclusion of our time together, you should be able to:together, you should be able to:


Mass-Mass ConversionsMass-Mass Conversions

Most often we are given a starting mass and want to find out the mass of a product we will get (called theoretical yield) or how much of another reactant we need to completely react with it (no leftover ingredients!)

Now we must go from grams to moles, to mole ratios, and back to grams of the compound we are interested in.

“Disorder in the American Courts”

These are statements people actually said in court, word for word, taken down and now

published by court reporters.

ATTORNEY: She had three children, right?WITNESS: Yes.ATTORNEY: How many were boys?WITNESS: None.ATTORNEY: Were there any girls?WITNESS: Your Honor, I think I need a different attorney. Can I get a new attorney?

Remember This??Remember This??

Atoms or Molecules

Moles

Mass (grams)

Moles of A Moles of A Moles of B Moles of B

Atoms or Molecules

Mass (grams)

Atoms or Molecules

Mass (grams)

Practice Mass-Mole-MassPractice Mass-Mole-MassConversion of Grams to Grams #1Conversion of Grams to Grams #1

How many grams of iron are required to make 86.7 grams of FeS

Fe + S8 FeS

8 Fe + S8 8 FeS

Mass-Mole-MassMass-Mole-Mass

8 Fe + S8 8 FeS

= 55.1 g Fe

86.7 g FeS x 1 mol FeS

87.92 g FeS

x 8 mol Fe

8 mol FeS

x 55.85 g Fe

1 mol Fe

How many moles of SHow many moles of S88 are needed? are needed?

8 Fe + S8 8 FeS

= 0.123 mol S8

86.7 g FeS x 1 mol FeS

87.92 g FeSx 1 mol S8

8 mol FeS

Some Things Just Take a Lot of Work!!!

Stoichiometry : Mole Ratios to Stoichiometry : Mole Ratios to Determining Grams of ProductDetermining Grams of ProductLet’s see if you can:Let’s see if you can:


Mass-Mole-MassMass-Mole-Mass

Now Try #2…Now Try #2…

Don’t you just love these types of problems???

it’s time to learn about.... what's the difference between roast beef and pea soup? anyone...

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