1. Ionic/Covalent Compounds Characteristics & Counting Atoms/Molecules

2. Ionic Compounds We already learned that ionic compounds are formed from 1 atom on the left and 1 atom on the right of the staircase on the Periodic Table getting together. Hundreds of compounds contain ionic bonds

3. Ionic compounds If ionic bonds occur between metals and oxygen, oxides form. Most other ionic compounds are called salts.

4. Ionic Compounds Many ionic compounds are binary (have 2 elements only) Binary compounds = 1 cation (positive ion) and 1 anion (negative ion) Cation = Loses electron Anion = Gains electron

5. Example CaF 2 = (Calcium = +2 charge ………………. (+2) (Fluoride = -1 charge …..-1 +-1 … (-2) Net: 0

6. Ionic compounds Form repeating patterns that form an ionic crystal….called a lattice crystal. (the cube) NaCl (Salt) is what shape under a microscope?

7. Ionic bonds Ionic bonds = Very strong…….hard to break….takes a lot of energy to break them. Ionic bonds = high melting points and high boiling points because it is hard to break the bonds and bonds must be broken to melt and to boil…….

8. Ionic Compounds In solid state….they are nonconductors of electricity…..because ions are fixed in solids and can’t move When dissolved into liquid…….electricity will go through them…..because ions are free to move……these liquids are called electrolytes

9. Counting Atoms and Molecules 2NaCl How many Na atoms? How many Chlorine atoms? How many NaCl compounds?

10. Counting Atoms and Molecules 2NaCl

11. Counting Atoms and Molecules 2NaCl How many NaCl compounds? 2 How many Na atoms? How many Chlorine atoms?

12. Counting Atoms and Molecules 2NaCl How many NaCl compounds? 2 How many Na atoms? 2 How many Chlorine atoms?

13. Counting Atoms and Molecules 2NaCl How many NaCl compounds? 2 How many Na atoms? 2 How many Chlorine atoms? 2

14. Guided Practice #1 3 CO 2 How many carbon atoms? How many oxygen atoms? How many molecules of CO 2 ?

15. Guided Practice #1 3 CO 2 How many molecules of CO 2 ? 3 How many carbon atoms? How many oxygen atoms?

16. Guided Practice #1 3 CO 2 How many molecules of CO 2 ? 3 How many carbon atoms? How many oxygen atoms?

17. Guided Practice #1 3 CO 2 How many molecules of CO 2 ? 3 How many carbon atoms? 3 How many oxygen atoms?

18. Guided Practice #1 3 CO 2 How many molecules of CO 2 ? 3 How many carbon atoms? 3 How many oxygen atoms? 6

19. Guided Practice #2 Ionic compounds have ____________ melting points and ____________ boiling points.

20. Guided Practice #2 Ionic compounds have HIGH melting points and HIGH boiling points.

21. Guided Practice 3# 5 KBr How many molecules of KBr= How many K atoms= How many Br atoms =

22. Guided Practice #3 5 KBr

23. Guided Practice #3 5 KBr How many molecules of KBr= 5 How many K atoms= How many Br atoms =

24. Guided Practice #3 5 KBr How many molecules of KBr= 5 How many K atoms= How many Br atoms =

25. Guided Practice #3 5 KBr How many molecules of KBr= 5 How many K atoms= 5 How many Br atoms =

26. Guided Practice #3 5 KBr How many molecules of KBr= 5 How many K atoms= 5 How many Br atoms = 5

27. Guided Practice #4 Oxides are formed when metals come together with _______________.

28. Guided Practice #4 Oxides are formed when metals come together with Oxygen.

29. Independent Practice Now it is your turn…..feel free to ask any questions whenever you are confused.