catalyst – may 6-4, 2011 grab a calculator!
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Catalyst – May 6-4, 2011 Grab a calculator!. Monday Mystery Element! Used to make batteries Can cause kidney failure and high blood pressure Found in tobacco leaves. Catalyst – May 6-4, 2011. Monday Mystery Element! Used to make batteries Can cause kidney failure and high blood pressure - PowerPoint PPT PresentationTRANSCRIPT
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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
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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!
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Today’s Agenda
Catalyst Welcome to STOICHIOMETRY!!! Holy Moley! Moles – Particles/Particles – Moles Moles – Mass/Mass – Moles Work Time Exit Question
HOMEWORK: Stoichiometry Worksheet
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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.
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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?????!!!???!?!?!???!!!!
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Think of the term “a dozen”…
How many donuts are in
a dozen?
How many eggs are in a
dozen?
The Mole
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Just like a dozen refers to 12 objects…
The mole refers to…
6.02 x 1023
particles
The Mole
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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
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Key Point #1:
1 mole (mol) =
6.02 x 1023
atoms OR molecules
Avogadro’s Number
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Stoichiometry Calculations Part One
Moles – Particlesand
Particles – Moles(Particles = Atoms or
Molecules)
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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…
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TRAIN TRACKS!!!
Step 1: What to what?
Step 2: Write conversion factor(s)
Step 3: Train tracks
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Write this down!!!
How many atoms of Na are in
3.4 moles Na?
Avogadro’s Number: Example #1
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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!
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Write this down!!!
How many moles of N2 are in
250 molecules N2?
Avogadro’s Number: Example #2
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How many molecules of C12H22O11 are in 2.1 moles of C12H22O11?
Avogadro’s Number: You Try!
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Stoichiometry Calculations Part Two
Moles – Massand
Mass – Moles
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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?
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“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
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1 mol Na =
Write this down!!!
Molar Mass: Example #2
22.99 g Na
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1 mol CO2 =
Write this down!!!
Molar Mass: Example #3
44.01 g CO2
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101.1 g KNO3
Molar Mass: You Try!
1 mol KNO3 =
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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
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If we have 20 grams CH4, how many moles of CH4 do
we have?
Write this down!!!
Molar Mass: Step-Up Problem #2
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Independent Practice
Worksheet time! Show your work!
Finish for Homework!Show Train Tracks on #7-14
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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!