Presentation is loading. Please wait.

Presentation is loading. Please wait.

Ionic Compounds Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130.

Similar presentations

Presentation on theme: "Ionic Compounds Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130."— Presentation transcript:

1 Ionic Compounds Chapter 14 pp Chapter 5 pp

2 Ionic Bonding n The forces of attraction that bind oppositely charged ion together n Q: Where does this attraction come from? n A: Positively charged ions and Negatively charged ions n Ionic compounds are electrically neutral n Also called salts

3 Formula Unit n Chemical formula for ionic compounds n The smallest sample of an ionic compound that has the composition of the compound. n NaCl = 1 Na atom + 1 Cl atom

4 How do we know how many of each ion combine with another ion? n Remember, charges in an ionic compound must be neutral n Example Br -1 AlBr 3 Al 3+ Br -1 Br -1 e-

5 Lets look at page 381 Try questions 9, 10, & 11

6 Properties of Ionic Compounds n When looking at ionic compounds we often will see that they are crystalline n A repeating 3-dimensional pattern is formed…

7 Coordination Number n The number of ions of opposite charge that surround each ion in a crystal n Example NaCl - 6

8 How do we know the coordination number? n X-ray crystallography n Patterns form when X-rays pass through a crystal onto X-ray film n Patterns are used to calculate the position of ions in the crystal

9 Electric Current n Some compounds conduct electric current when dissolved in solution. n Some compounds conduct an electric current in the molten state. n How does this happen? n When a current is passed through a solution cations and anions polarize or migrate to one electrode

10 Electric Current continued. n Ions move to the poles opposite to their charge. n The current is passed between two electrodes n Lets take a look at a demonstration...

11 Metallic Bonding n Consist of the attraction of free-floating valence electrons for the positively charged metal cations n These electrons are floating around the cations n These moving electrons effect the physical and chemical properties of metals

12 Metallic Bonding contd. n Metals can change shape because of electrons surrounding the ions n Example: ductility n Ionic crystals break in cleavage plains because particles of the same charge come near each other, thus repelling one another

13 Metals and Electrical Conductivity n Metals conduct electricity because electrons are passed from one end of the metal to another n As e- are added to one end of the metal, more e- are leaving at the other end of the metal

14 Shapes of Metals n Body-centered cubic –every atom has 8 neighbors n Face-centered cubic –every atom has 12 neighbors n Hexagonal close-packed –every atom has 12 neighbors, but different arrangement from Face-centered n Page Fig

Download ppt "Ionic Compounds Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130."

Similar presentations

Ads by Google