Post on 14-Jan-2016
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Catalyst – May 6-4, 2011Grab 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 1023
particles
The Mole
This number is called Avogadro’s number…
6.02 x 1023
EQUALS
602,000,000,000,000,000,000,000
http://molechemistry.info/
Avogadro’s Number
Key Point #1:
1 mole (mol) =
6.02 x 1023
atoms OR molecules
Avogadro’s Number
Stoichiometry Calculations Part One
Moles – Particlesand
Particles – Moles(Particles = Atoms or
Molecules)
Avogadro LOVES Us!
Key Point #2: Avogadro's number (6.02 x 1023) 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 1023… Type 6.02 EE 23 instead
SAVE TIME AND LOOK COOL!
Write this down!!!
How many moles of N2 are in
250 molecules N2?
Avogadro’s Number: Example #2
How many molecules of C12H22O11 are in 2.1 moles of C12H22O11?
Avogadro’s Number: You Try!
Stoichiometry Calculations Part Two
Moles – Massand
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 #1
12.01 g C
1 mol Na =
Write this down!!!
Molar Mass: Example #2
22.99 g Na
1 mol CO2 =
Write this down!!!
Molar Mass: Example #3
44.01 g CO2
101.1 g KNO3
Molar Mass: You Try!
1 mol KNO3 =
If we have 3.5 moles of KNO3, how many grams of KNO3
would we have?
Write this down!!!
Molar Mass: Step-Up Problem #1
If we have 20 grams CH4, how many moles of CH4 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 NH4?
2. How many grams are in 2.3 moles of NH4
HW: Finish Worksheet and read 12.1 and 12.2 in book!