Catalyst
Write a paragraph (at least 5 sentences) answering
at least 1 of the following questions:
How do you use chemicals in your daily life?
When you hear the words “chemical reaction”
what do you think of?
• HW Due Today: Read textbook pp. 230, 236-240
• pp. 233 #6(b, c, d), 7(c), 8(b)
• Valence electron review worksheet!
• Tonight’s HW: Study for Unit 2 Exam.
Lesson Objective
I can explain what the
different kinds of
chemical bonds are and
how they are formed.
Agenda
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Catalyst
HW Review
Unit 2 Stations
Exit Slip
HW: pp. 233 #6(b, c, d), 7(c), 8(b)
6 – converting moles to particles – conversion
factor is 6.022 x 1023 particles
1.00 mole
6(b) Answer: 2.7 x 1024 molecules BCl3
6(c) Answer: 1.5 x 1023 ions K+
6(d) Answer: 3.626 x 1024 molecules O2
7(c) Answer: 3.08 x 1024 Na+ ions
8(b) convert atoms to moles –
Answer: 0.1661 mol C
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.
1 mole (mol) = 6.02 x 1023
This number is a constant.
The number of particles in 1 mole is
called
Avogadro’s
Number!
6.02 x 1023
Avocado
Avogadro
Review- The mole - MEMORIZE
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)
Stations! Instructions
• There are 8 stations. There are 2 stations per
table.
• Groups of 3 or 4.
• Begin at the station closest to your seat.
• The directions are at your station.
• Show all your work on a separate sheet of
paper. Label your paper with the station
number.
• I will collect your work at the end of class.
Exit Slip
1. Draw the Lewis Dot structure for the
molecule: HBr
2. How many molecules of HBr are in 2.00 mole
of HBr?
3. Which has more atoms: A mole Platinum or a
mole of tin?
Random Mole Facts!
• 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.