Catalyst – May 6-4, 2011 Grab a calculator! Monday Mystery Element! 1. Used to make batteries 2. Can cause kidney failure and high blood pressure 3. Found.

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Catalyst – May 6-4, 2011 Grab a calculator! Monday Mystery Element! 1. Used to make batteries 2. Can cause kidney failure and high blood pressure 3. Found in tobacco leaves

Catalyst – May 6-4, 2011 Monday Mystery Element! 1. Used to make batteries 2. Can cause kidney failure and high blood pressure 3. Found in tobacco leaves Discovered by Strohmeyer in 1817…..it is…… CADMIUM!

Today’s Agenda  Catalyst  Welcome to STOICHIOMETRY!!!  Holy Moley!  Moles – Particles/Particles – Moles  Moles – Mass/Mass – Moles  Work Time  Exit Question HOMEWORK: Stoichiometry Worksheet

Today’s Objectives  SWBAT perform mole – particle and particle – mole calculations.  SWBAT calculate the molar mass of chemical substances.  SWBAT perform mole-mass and mass-mole calculations.

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?????!!!???!?!?!???!!!!

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 refers to… 6.02 x particles The Mole

This number is called Avogadro ’ s number … 6.02 x EQUALS 602,000,000,000,000,000,000,000 Avogadro’s Number

Key Point #1: 1 mole (mol) = 6.02 x atoms OR molecules Avogadro’s Number

Stoichiometry Calculations Part One Moles – Particles and Particles – Moles (Particles = Atoms or Molecules)

Avogadro LOVES Us!  Key Point #2: Avogadro's number (6.02 x ) is used to convert between moles and particles (atoms/molecules).  It all relates back to the mole…  Guess what’s coming back…

TRAIN TRACKS!!!  Step 1:  What to what?  Step 2:  Write conversion factor(s)  Step 3:  Train tracks

Write this down!!! How many atoms of Na are in 3.4 moles Na? Avogadro’s Number: Example #1

Scientific Notation on the Calculator  Don’t forget! When you need to type in a scientific notation number like 6.02 x …  Type 6.02 EE 23 instead SAVE TIME AND LOOK COOL!

Write this down!!! How many moles of N 2 are in 250 molecules N 2 ? Avogadro’s Number: Example #2

How many molecules of C 12 H 22 O 11 are in 2.1 moles of C 12 H 22 O 11 ? Avogadro’s Number: You Try!

Stoichiometry Calculations Part Two Moles – Mass and Mass – Moles

OOOH, I want some more train tracks!  Key Point #3: Molar mass is the number of grams in one mole of a substance. It is used to convert between moles and mass.  But Ms. Stroh, how am I ever going to find out this information?

“ What is the molar mass? ” means… “How many grams are in one mole of a substance?” 1 mol C = Molar Mass: Example # g C

1 mol Na = Write this down!!! Molar Mass: Example # g Na

1 mol CO 2 = Write this down!!! Molar Mass: Example # g CO 2

101.1 g KNO 3 Molar Mass: You Try! 1 mol KNO 3 =

If we have 3.5 moles of KNO 3, how many grams of KNO 3 would we have? Write this down!!! Molar Mass: Step-Up Problem #1

If we have 20 grams CH 4, how many moles of CH 4 do we have? Write this down!!! Molar Mass: Step-Up Problem #2

Independent Practice  Worksheet time! Show your work!  Finish for Homework!  Show Train Tracks on #7-14

Exit Question 1. How many molecules are in 1 mole of NH 4 ? 2. How many grams are in 2.3 moles of NH 4 HW: Finish Worksheet and read 12.1 and 12.2 in book!