1. Chemistry 102 Dr. Don DeCoste 367J Noyes Lab decoste@illinois.edu 3-4 pm Tuesdays and Thursdays By appointment; open door policy http://chem.illinois.edu 1

2. To Do Continue reading Chapter 3. Text homework for Chapter 3. Quiz on Friday (1-3.4) Lon-Capa assignment #1. 2

3. Using The Periodic Table Symbol, name, number of protons (all of these are related). Number of electrons in a neutral atom or in ion. Charges for common ions. Metals and non-metals. Formulas of ionic compounds. Naming simple compounds. 3

4. Forming a Cation 4

5. Forming an Anion 5

6. Using The Periodic Table 6

7. Three Types of Binary Compounds Metal (Groups 1,2, 3) and nonmetal Simple naming: sodium chloride [NaCl]. Metal (transition) and nonmetal Roman numerals: cobalt(II) chloride [CoCl 2 ]. Two nonmetals Prefixes: carbon dioxide [CO 2 ]. 7

8. Three Types of Binary Compounds Na 2 O Cu 2 O N 2 O 8

9. Type I Compound Na 2 Osodium oxide 9

10. Type II Compound Cu 2 Ocopper(I) oxide 10

11. Type III Compound N 2 O: dinitrogen monoxide 11

12. Type III Compound N 2 O 5 dinitrogen pentoxide 12

13. Clicker Question How many of the following is/are named incorrectly? I. PCl 3 phosphorus(III) chloride II. KCl potassium monochloride III. CoO cobalt oxide IV. Fe 2 O 3 iron(II) trioxide a) 0 b) 1 c) 2 d) 3 e) 4 13

14. Clicker Question These are correct: I. PCl 3 phosphorus trichloride II. KCl potassium chloride III. CoO cobalt(II) oxide IV. Fe 2 O 3 iron(III) oxide 14

15. Clicker Question The mass of a single atom of hydrogen is: a) 1.008 g b) 2.016 g c) 1.000 mole d) 1.674 x 10 -24 g e) 6.022 x 10 23 g 15

16. Clicker Question You have a 12.01 g sample of carbon and a 1.008 gram sample of hydrogen. a) The number of carbon atoms is greater than the number of hydrogen atoms. b) The number of carbon atoms is less than the number of hydrogen atoms. c) The number of carbon atoms is the same as the number of hydrogen atoms. 16

17. The Mole Concept: Why?  We can count by weighing (relative masses).  Reactions occur by number of particles, we must deal with masses, so we must have a way of converting between number and mass.  Atoms/molecules are very small! 17

18. Clicker Question You have equal mass samples of copper (Cu) and magnesium (Mg). Which sample contains the greater number of atoms? a) The sample of magnesium. b) The sample of copper. c)The samples contain the same number of atoms. d) I have no idea. 18

19. A Question For You… You have a 10.0 g sample of copper (Cu). Determine the mass of magnesium (Mg) such that the number of copper atoms equals the number of magnesium atoms. 19

20. A Question For You… You have 50.0 g of water. How many moles of H 2 O molecules do you have? How many moles of hydrogen atoms are present in this sample? 20