Launch: 11/23   Grab your binder and immediately take a seat!

  Place homework (practice questions from Thursday) on desk

  Read handout “The Mole” and answer all 4 questions

Announcements   This is a really important week!

  Points end on Wednesday   Be engaged   Be respectful

What is a mole? Mr. Heffner 11/23/09

What is a mole?

What is a mole?   A mole is a unit of measurement.

  1 dozen eggs = 12 eggs

  1 mole eggs = 6.02 X 1023 eggs

602,000,000,000,000,000,000,000

That’s a really big number!

Scientific Notation

What is a mole?   1 mole of __________ = 6.02 X 1023 _____________

  Moles are used for atoms and molecules   Because they are so tiny!

“Six point 0 two times ten to the twenty-third”

Who defined the mole?   Amadeo Avogadro in 1811

  Avogadro’s number

6.02 X 1023 atoms

“the number of atoms in 12g of carbon-12 is equal to 1 mole”

..or particles, or molecules

“The Mole” handout   Using your notes, add more information to each of

your answers from the launch

  Pair, share

Practice Questions   Answer the following in complete sentences:

1.  What is a mole? 2.  How is a mole defined?

3.  What is Avogadro’s number (in standard and scientific form)? 4.  How many pencils are there in 1 mole of pencils? 5.  How many oxygen (O) atoms are there in one mole?

6.  How many particles are found in 1 mole of sodium (Na)? 7.  One mole of nitrogen gas (N2) is equal to how many

molecules? 8.  How many moles are there in 12g of carbon-12? 9.  How many moles are there in 24g of carbon-12?

Exit Slip 1.  Which of the following is true about a mole?

a.  It is a very small number. b.  It is a unit of measurement used to quantify numbers

of atoms, molecules, and particles. c.  It is defined as the number of grams in an atom. d.  It has a different value depending on the type of

element.

Exit Slip 2.  One mole is defined as

a.  the number of atoms found in 12g of carbon-12 b.  the number of atoms found in 12g of carbon-14

c.  the number of eggs in one dozen d.  6.02 grams of carbon-12

Exit Slip 3.  Avogadro’s number is

a.  6 X 1023 b.  6.02 X 23

c.  6.02 X 1023 d.  10 X 623

Exit Slip 4.  How many oxygen-16 (O) atoms are there in 1 mole?

a.  1.00 atoms b.  16.00 atoms

c.  602 atoms d.  6.02 X 1023 atoms

Exit Slip 5.  How many moles are there in 6g of carbon-12?

a.  .5 moles b.  1 mole

c.  2 moles d.  12 moles

Homework   Finish practice questions