1. The Mole

2. different units of measure
1 dozen eggs = 12
1 gross of pencils = 144
1 ream of paper = 500 sheets
Things are measured in
different units of measure
1 ton of gravel = 2000 pounds

3. The Mole Chemistry uses a special measurement called the “mole”
This is a very big number….so important the number
has a special name:
AVOGADRO’S NUMBER

4. Avogadro’s number, the number of atoms in
one mole, was estimated by making a
one-atom layer of oil across the surface
of a pond. Using the area covered by the oil,
its mass, and an estimate of molecular length,
a "ballpark figure" for Avogadro's number was
calculated.

5. number of atoms (or molecules)
A mole is the
number of atoms (or molecules)
in these samples
A mole of sulfur,
iron, and mercury

6. 602,000,000,000,000,000,000,000
1 Mole = (6.02 X 1023) “things” atoms, molecules, electrons etc.
How big is a mole...

7. cover the earth to a depth
A mole of pennies would
cover the earth to a depth
of 300 meters

8. One mole of high school textbooks would cover the
USA to a depth of about 320 km (200) miles.

9. A mole of marbles would spread over the surface
of the earth, and produce a layer about 50 miles thick.

10. There is about 1 mole
of stars in the universe.

11. A mole of dollars could not be spent at the rate of a billion dollars a day over a trillion years.

12. If one mole of particles the size of sand grains were
blasted by an eruption from Mt. St. Helens,
they would cover Washington State to the depth
of a ten-story building.

13. Water flows over the Niagara Falls at
about 172 million gallons per minute.
At this rate it would take 134,000
years for one mole of water
DROPS (6.023 X 1023 drops)
to flow over the falls

14. One mole of marshmallows would cover the USA to
a depth of 6500 miles.

15. Because one gumdrop weighs more than one jellybean,
you can’t get equal numbers by taking equal weights.

16. Equal numbers of molecules each have their own separate weights

17. 9.4 grams 13 grams A “roll” of dimes weighs 43 grams and contains
50 dimes. How much would
11 dimes weigh?
A “roll” of nickels weighs 59 grams
and contains 50 dimes. How much
would 11 nickels weigh?
11 nickels X 59 grams X 1 roll =
1 roll nickels
11 dimes X 43 grams X 1 roll =
1 roll dimes
9.4 grams
13 grams

20. You can count molecules of air by knowing the volume
of the air Liters of air is one mole of air at standard
temperatures and pressures.

21. good chemistry site
prentice hall pictures
links for chemists
The wired chemist
Lecture notes on the mole
chemdex