2. 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.

3. Lesson Objective I can explain what the different kinds of chemical bonds are and how they are formed.

4. Agenda Catalyst HW Review Unit 2 Stations Exit Slip

5. 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 10 24 molecules BCl 3 6(c) Answer: 1.5 x 10 23 ions K + 6(d) Answer: 3.626 x 10 24 molecules O 2 7(c) Answer: 3.08 x 10 24 Na + ions 8(b) convert atoms to moles – Answer: 0.1661 mol C

6. What is the mole? (Notes) A mole is the number of atoms in 12 grams of carbon-12. There are 6.022 x 10 23 atoms in 12 grams of carbon-12. 1 mole (mol) = 6.022 x 10 23 particles.

7. 1 mole (mol) = 6.02 x 10 23 This number is a constant. The number of particles in 1 mole is called Avogadro’s Number!

8. 6.02 x 10 23 Avocado Avogadro

9. Review- The mole - MEMORIZE 1 mole = 6.02 x 10 23 particles 6.02 x 10 23 is called Avogadro’s number The periodic table is based on the molar mass of carbon (C)

10. 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.

11. 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?

12. Random Mole Facts! Since the Earth has a radius of about 6400 km, its volume is approximately 10 21 m 3. 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.