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Catalyst: Happy Wednesday!. Which quantity is larger? 4.5 x 10 34 or 6.5 x 10 20 2.3 x 10 -3 or 4.5 x 10 -6 5000 or 5 x 10 5 HW Due: Read textbook pp. 224-229 Do problems: pp. 233 #1, 2, 4, 5, 6(a), 8(a) Tonight’s HW: Read textbook pp. 230, 236-240 pp. 233 #6(b, c, d), 7(c), 8(b )

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Catalyst happy wednesday
Catalyst: Happy Wednesday!

Which quantity is larger?

  • 4.5 x 1034 or 6.5 x 1020

  • 2.3 x 10-3 or 4.5 x 10-6

  • 5000 or 5 x 105

  • HW Due: Read textbook pp. 224-229

  • Do problems: pp. 233 #1, 2, 4, 5, 6(a), 8(a)

  • Tonight’s HW: Read textbook pp. 230, 236-240

  • pp. 233 #6(b, c, d), 7(c), 8(b)

  • Valence electron review worksheet!


Lesson objective
Lesson Objective

I will be able to explain what a “mole” in chemistry means!


Agenda
Agenda

  • Catalyst

  • HW Review

  • Intro to Molar Conversions Worksheet

  • Exit Slip


Hw pp 233 1 2 4 5 6 a 8 a
HW: pp. 233 #1, 2, 4, 5, 6(a), 8(a)

1. A mole is the number of atoms in exactly 12 g of carbon-12.

2. There are 6.022 x 1023 particles in one mole. “Particles” refers to atoms, ions, or molecules.

  • 1 mol of nickel(II) and 1 mol of nickel(III) both contain exactly 6.022 x 1023 ions.

    • (This is like asking “which is heavier: 1 pound of feathers or a 1 pound brick?” They are both 1 pound! Similarly, 1 mol of anything always contains 6.022 x 1023 of whatever is being counted.)

  • 1.11 mol Pt is more than 6.022 x 1023 atoms.

    • (This is the same as asking whether 1.11 is more or less that 1.00 because 1.00 mol = 6.022 x 1023 particles. 1.11 is more than 1.00.)


Hw review continued
HW Review Continued…

  • 6(a). 1.204 x 1024 ions Fe3+

  • 8(a). 0.500 mol H2O

  • We will work through how to answer these questions in today’s lesson!


Focus questions today
Focus Questions Today

  • What is a mole, besides a small mammal or a growth on your body, and what is it good for, besides digging holes?

  • Do all moles weigh the same amount?


Analogy: Think of the term dozen...

How many doughnuts are in a dozen?

How many eggs are in a dozen?

How many bricks are in a dozen?

How many ostriches are in a dozen?




Counting by weighing
Counting By Weighing

  • Atoms and molecules are too small to see

  • We measure out atoms by using a number called the mole!!!!


What is the mole notes
What is the mole? (Notes)

  • A mole is the number of atoms in 12 grams of carbon-12.

  • There are 6.022 x 1023 atoms in 12 grams of carbon-12.

  • 1 mole (mol) = 6.022 x 1023 particles.


A mole is very similar to a dozen. But instead of meaning 12 of something, it means

6.02 x 1023 of something.

6.02 x 1023 = 602,000,000,000,000,000,000,000

Or

Six hundred and two sextillion!


1 mole (mol) = 6.02 12 of something, it meansx 1023

This number is a constant.

The number of particles in 1 mole is called Avogadro’s Number!


6.02 x 10 12 of something, it means23

Avocado

Avogadro


So one mole of... 12 of something, it means

...doughnuts is 6.02 x 1023 doughnuts

... Ostriches is 6.02 x 1023 ostriches

...oxygen atoms is 6.02 x 1023 atoms of oxygen (O)

...oxygen molecules is 6.02 x 1023 molecules of oxygen (O2)


Review the mole memorize
Review- The mole - MEMORIZE 12 of something, it means

  • 1 mole = 6.02 x 1023 particles

  • 6.02 x 1023 is called Avogadro’s number

  • The periodic table is based on the molar mass of carbon (C)


The mole why
THE MOLE 12 of something, it means -- Why?

  • Why is the mole useful to us as chemists??

  • Make a dot on your paper with your pencil.

  • Guess how many atoms of Carbon graphite are in that dot.

  • 25 million atoms in that tiny dot!


Say it
Say it! 12 of something, it means

  • How many particles are in 1 mole?

    • 6.02 x 1023

  • How many atoms are in 1 mole of carbon?

  • How many atoms are in 1 mole of sodium?

  • How many atoms are in 1 mole of helium?

  • How many ducks are in 1 mole of ducks?


Conversions
Conversions 12 of something, it means

MOLES

particles


How many particles are in 1 mole of something
How many 12 of something, it meansparticlesare in 1 mole of something?

6.02 x 1023

To convert from number of moles to number of particles, multiply the number of moles by the conversion factor:

6.022 x 1023

1 mol


Example 1
Example 1: 12 of something, it means

  • How many particles are in 2.00 moles?

  • Multiply

    2.00 mol x 6.022 x 1023 particles = 12.04 x 1023

    1.00 mol


How many particles are in 1 mole of something1
How many 12 of something, it meansparticlesare in 1 mole of something?

6.02 x 1023

To convert from number of particles to number of moles, multiply the number of moles by the conversion factor:

1 mol___

6.022 x 1023


Example 2
Example 2: 12 of something, it means

  • How many moles is 3.01 x 1022 atoms?

  • Multiply

    (3.01 x 1022atoms) x __1.00 mole = 0.5 x 10-1 mole

    6.022 x 1023 atoms

    Scientific notation… 0.5 x 10-1 mole = 5.0 x 10-2 mole


Agenda1
Agenda 12 of something, it means

  • Catalyst

  • HW Review

  • Intro to Molar Conversions Worksheet

  • Exit Slip


Exit slip
Exit Slip 12 of something, it means

  • Draw the Lewis Dot structure for the molecule: HBr

  • How many molecules of HBr are in 2.00 mole of HBr?

  • Which has more atoms: A mole Platinum or a mole of tin?


Random mole facts
Random Mole Facts! 12 of something, it means

  • Since the Earth has a radius of about 6400 km, its volume is approximately 1021 m3. Since about 500 large grapefruit will fit in one cubic meter, it therefore follows that a mole of grapefruit would have approximately the same volume as the Earth.

  •  If you had exactly one mole of sheets of paper, you could make one million equal stacks from sea level on the earth that would pass the sun. 

  • If you had a mole of pennies, you could give out enough money to everyone in the world so that they could spend a million dollars every hour, day and night, for the rest of their lives.


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