Catalyst – 22+33-1, 2.009 * 103

Welcome Back!Monday Mystery

Element!1. Like many rare earth

elements, is used to make phosphors in TVs

2. Attracted to magnets3. Oxides of this element

flake off during tarnishing

Weekly Goal!

Catalyst – 22+33-1, 2.009 * 103

Welcome Back!Monday Mystery

Element!1. Like many rare earth

elements, is used to make phosphors in TVs

2. Attracted to magnets3. Oxides of this element

flake off during tarnishing

Gadolinium

Today’s Agenda

Catalyst Debrief: What needs to happen

the rest of the semester to ensure success!

Unit 5 Test Tracking and Review Holy Moley! Work Time Exit Question

Today’s Objectives

SWBAT get ready to DOMINATE the rest of the semester – 3 more weeks!

SWBAT describe the mole. SWBAT perform stoichiometry

to convert between moles and molar mass.

Our Class Mastery – 2nd Period

HOW DID WE DO????

65%

Our Class Mastery – 2nd Period

HOW DID WE DO????

60%

Our Big Goal!!!

Do you remember what it is???

That’s right! 80% mastery or higher of GLEs!

We can still do it…But it will take a lot of hard

work!!!

Ways to improve our class mastery

How do YOU think we can get it done???Improve class ATTENDANCE!

FOCUS during class!ASK questions and/or come in for

TUTORINGComplete ALL class and homework

Study EFFECTIVELYHave someone quiz you, cover up notes

and see what you remember, pinpoint areas for improvement, etc.

Chemistry CANES need to be/need to…

CConsiderate

AAmbitious

NNever give up

EExcellent

SStrong

New Personal Motto (5 minutes)Take one post-it note and write your personal motto for the rest of the semester.

Write down the words you will live by for the next 3 weeks.

What is a mole to us chemists? A benign overgrowth of cells because of

a failure in mitosis? NO! But gross… A rascly little rodent? NOOOO! A TV show featuring celebrities? NOOOOO! Then WHAT IS IT?????!!!???!?!?!???!!!!

The Mole

Think of the term “a dozen”…

How many donuts are in a

dozen?

How many eggs are in a

dozen?

The Mole

Just like a dozen refers to 12 objects…

The Mole

Just like a dozen refers to 12 objects…

… the mole refers to …

The Mole

Just like a dozen refers to 12 objects…

… the mole refers to …

6.02 x 1023

particles

The Mole

This number is called Avogadro’s number…

6.02 x 1023

602,000,000,000,000,000,000,000

Avogadro’s Number

1 mol = 6.02 x 1023 atoms

1 mol = 6.02 x 1023

molecules

Why do YOU know this?

The Mole

Key Point #1: The mole is a unit of measurement used in chemistry.

Interpreting Equations

4 Fe + 3 O2 2 Fe2O3

“4 moles of iron react with 3

moles of oxygen gas toproduce 2 moles of iron(III)

oxide”Coefficients in chemical

reactions just refer to how many moles are reacting!

Interpreting Equations

C3H8 + 5 O2 3 CO2 + 4H2O

“1 mole of propane (C3H8)reacts with 5 moles of oxygen

gas to produce 3 moles of carbon

dioxide and 4 moles of water”

How many moles needed?(moles – moles)

C3H8 + 5 O2 3 CO2 + 4H2O

If you start with 10.0 molesof propane (C3H8), how many

moles of oxygen gas is neededto fully combust (react)?

How many moles produced? (moles – moles)

C3H8 + 5 O2 3 CO2 + 4H2O

If you start with 10.0 molesof propane (C3H8), how manymoles of carbon dioxide will

be produced?

What’s the point of all this?

Key Point #2: Stoichiometry relates the amount of REACTANTS with the amount of PRODUCTS. It all relates back to the mole…

Scientists use stoichiometry to plan reactions! And guess what else is coming back….

Working on the Railroad

Step 1: What to what?

Step 2: Write conversion factor(s)

Step 3: Train tracks

Avogadro’s Number

1 mol = 6.02 x 1023 atoms

How many atoms are in .25 mol N2?

Avogadro’s Number

1 mol = 6.02 x 1023 atoms

How many atoms are in .25 mol N2?.25 mol N2

Avogadro’s Number

1 mol = 6.02 x 1023 atoms

How many atoms are in .25 mol N2?.25 mol N2

1 mol N2

6.02 x 1023 atoms

I guess you can use your calculator for this…

Your turn! Whiteboards.

How many atoms are in 1.1 moles of C12H22O11?

OOOH, I want some more train tracks!

Key Point #3: Molar mass is the amount of grams in one mole of a substance.

But Ms. Stroh, how am I ever going to find out this information?

Molar Mass

1 mol C =

Molar Mass

1 mol C = 12 g C

Molar Mass

The atomic weight of an atom is also the molar mass of that atom.

Carbon has an atomic weight of 12.01.

In 1 mole of carbon, there are 12.01 grams.

In 1 mole of sodium, how many grams are there?

Molar Mass

1 mol Na =

Molar Mass

1 mol Na = 23 g Na

Molar Mass-Can you figure out this one??

1 mol CO2 =

Molar Mass

1 mol CO2 =

C = 12 g O = 16 gO = 16 g

Molar Mass

1 mol CO2 =

C = 12 g + O = 16 g + O = 16 g

Molar Mass

1 mol CO2 = 44 g CO2

C = 12 g + O = 16 g + O = 16 g

Molar Mass

1 mol KNO3 =

K = + N = + O =

Molar Mass

1 mol KNO3 =

K = 39 g + N = 14 g + (3) O = 16 g

Molar Mass

1 mol KNO3 = 101 g

K = 39 g + N = 14 g + (3) O = 16 g

Exit Question

1. What is a mole?2. Calculate the

molar mass of H2CO3.

Molar Mass- Let’s try a problem

1 mol KNO3 = 101 g If we have 3.5 moles of KNO3, how many

grams would we have?

Molar Mass

1 mol CH4 =If we have 20 grams CH4, how many

moles of CH4 do we have?

Independent Practice

1, 11, 16… we will go over to show you how to solve this hilarious assignment!

Attach your work on a separate sheet of paper.

Exit Question

1. How many molecules are in a mole of NH4?

2. How many grams are there in 2.3 moles of NH4?