Catalyst – , * 10 3 Welcome Back! Monday Mystery Element! 1. Like many rare earth elements, is used to make phosphors in TVs 2. Attracted to magnets 3. Oxides of this element flake off during tarnishing Weekly Goal!

Catalyst – , * 10 3 Welcome Back! Monday Mystery Element! 1. Like many rare earth elements, is used to make phosphors in TVs 2. Attracted to magnets 3. Oxides of this element flake off during tarnishing Gadolinium

Todays 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

Todays 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 – 2 nd Period HOW DID WE DO???? 65%

Our Class Mastery – 2 nd Period HOW DID WE DO???? 60%

Our Big Goal!!! Do you remember what it is??? Thats 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 TUTORING Complete ALL class and homework Study EFFECTIVELY Have someone quiz you, cover up notes and see what you remember, pinpoint areas for improvement, etc.

Chemistry CANES need to be/need to… C C onsiderate A A mbitious N N ever give up E E xcellent S S trong

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 particles

The Mole This number is called Avogadro s number … 6.02 x ,000,000,000,000,000,000,000

Avogadro s Number 1 mol = 6.02 x atoms 1 mol = 6.02 x 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 O 2 2 Fe 2 O 3 4 moles of iron react with 3 moles of oxygen gas to produce 2 moles of iron(III) oxide Coefficients in chemical reactions just refer to how many moles are reacting!

Interpreting Equations C 3 H O 2 3 CO 2 + 4H 2 O 1 mole of propane (C 3 H 8 ) 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) C 3 H O 2 3 CO 2 + 4H 2 O If you start with 10.0 moles of propane (C 3 H 8 ), how many moles of oxygen gas is needed to fully combust (react)?

How many moles produced? (moles – moles) C 3 H O 2 3 CO 2 + 4H 2 O If you start with 10.0 moles of propane (C 3 H 8 ), how many moles of carbon dioxide will be produced?

Whats 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 atoms How many atoms are in.25 mol N 2 ?

Avogadro s Number 1 mol = 6.02 x atoms How many atoms are in.25 mol N 2 ?.25 mol N 2

Avogadro s Number 1 mol = 6.02 x atoms How many atoms are in.25 mol N 2 ?.25 mol N 2 1 mol N x atoms I guess you can use your calculator for this…

Your turn! Whiteboards. How many atoms are in 1.1 moles of C 12 H 22 O 11 ?

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 In 1 mole of carbon, there are 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 CO 2 =

Molar Mass 1 mol CO 2 = C = 12 gO = 16 gO = 16 g

Molar Mass 1 mol CO 2 = C = 12 g+ O = 16 g + O = 16 g

Molar Mass 1 mol CO 2 = 44 g CO 2 C = 12 g+ O = 16 g + O = 16 g

Molar Mass 1 mol KNO 3 = K = + N = + O =

Molar Mass 1 mol KNO 3 = K = 39 g + N = 14 g + (3) O = 16 g

Molar Mass 1 mol KNO 3 = 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 H 2 CO 3.

Molar Mass- Lets try a problem 1 mol KNO 3 = 101 g If we have 3.5 moles of KNO 3, how many grams would we have?

Molar Mass 1 mol CH 4 = If we have 20 grams CH 4, how many moles of CH 4 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 NH 4 ? 2. How many grams are there in 2.3 moles of NH 4 ?