1. Do Now If you baked goodies for today, please turn in your paper and open you treats on table #7 If you baked goodies for today, please turn in your paper and open you treats on table #7 Everybody else, please help yourself to some delicious snacks from the back of the room at table #7 Everybody else, please help yourself to some delicious snacks from the back of the room at table #7 When you return to your seat please take out your HW When you return to your seat please take out your HW

2. National Mole Day Celebrating the Molennium

3. The Biology of a Mole Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Insectivora Family: Talpidae

4. Wrong kind of Mole !! Mole !!

5. In Chemistry a Mole is a Unit It is an SI unit symbolizing an amount of matter

6. The Number We have words in English that signify a certain number of items Couple : two Dozen : twelve Baker’s dozen : 13 Gross : 144

7. The Number A mole also represents a certain number of things A mole represents 6.022 x 10 23 things

8. 6.022 x 10 23

9. The Number That’s a 6 followed by 23 zeros ! ! ! That’s a 6 followed by 23 zeros ! ! ! That is truly a mindboggling number. That is truly a mindboggling number. Just how big is it? Glad you asked. Just how big is it? Glad you asked.

10. A little number crunching A person who lives seventy years lives 2.2 x 10 9 seconds, about 2 billion seconds. If this person could count to a billion during each second of his life he could still not count this high

11. More number crunching If each of the six billion people on the face of the earth were given 100 trillion dollars each, the sum total of all the money would equal one mole of dollars. If each of the six billion people on the face of the earth were given 100 trillion dollars each, the sum total of all the money would equal one mole of dollars.

12. More number crunching If you were to cover the state of Texas in quarters, and then stacked quarter upon quarter, you would have to make enough layers of quarters covering Texas to measure over 400 miles high before you would have one mole of quarters.

13. Why would anyone ever need a number this big? Glad you asked

14. A little background The need for the number comes from an attempt to make a connection between the smallest particle of a substance and a measurable amount in a lab.

15. Atomic masses Atomic masses listed on a periodic table are given in units called atomic mass units. Atomic masses listed on a periodic table are given in units called atomic mass units. Unfortunately, these units are very tiny, and are very nearly impossible to measure in the lab. Unfortunately, these units are very tiny, and are very nearly impossible to measure in the lab. An Italian scientist discovered a way to show that a certain number of atoms of any certain substance had a mass of the same number in grams as the atomic mass was in atomic mass units An Italian scientist discovered a way to show that a certain number of atoms of any certain substance had a mass of the same number in grams as the atomic mass was in atomic mass units

16. A mole of a substance One carbon atom Has an atomic mass Of 12.0 atomic mass units Using the same number, 12.0, but changing the unit to grams represents one mole of carbon 6.022 x 10 23 one mole of atoms

17. The discoverer Amedeo Avogadro was the Italian scientist that calculated the number that equals one mole. For that reason the number itself is named after him. Avogadro’s Number, N A, is the basis for the mole This guy kind of looks like a mole!

18. So, what’s the clincher? The mole allows us to calculate the number of atoms in a certain number of grams. Since grams of a substance are easily measured in a lab, we now have a way to find out how many atoms are in a laboratory sized sample of material. !