Presentation on theme: "Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130 Ionic Compounds Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130."— Presentation transcript:
1 Chapter 14 pp. 373 - 386 Chapter 5 pp. 109 - 130 Ionic CompoundsChapter 14 ppChapter 5 pp
2 Ionic BondingThe forces of attraction that bind oppositely charged ion togetherQ: Where does this attraction come from?A: Positively charged ions and Negatively charged ionsIonic compounds are electrically neutralAlso called salts
3 Formula Unit Chemical formula for ionic compounds The smallest sample of an ionic compound that has the composition of the compound.NaCl = 1 Na atom + 1 Cl atom
4 How do we know how many of each ion combine with another ion? Remember, charges in an ionic compound must be neutralExampleBr -1AlBr3 Al3+ Br -1e-e-e-
6 Properties of Ionic Compounds When looking at ionic compounds we often will see that they are crystallineA repeating dimensional pattern is formed…
7 Coordination NumberThe number of ions of opposite charge that surround each ion in a crystalExampleNaCl - 6
8 How do we know the coordination number? X-ray crystallographyPatterns form when X-rays pass through a crystal onto X-ray filmPatterns are used to calculate the position of ions in the crystal
9 Electric CurrentSome compounds conduct electric current when dissolved in solution.Some compounds conduct an electric current in the molten state.How does this happen?When a current is passed through a solution cations and anions polarize or migrate to one electrode
10 Electric Current continued. Ions move to the poles opposite to their charge.The current is passed between two electrodesLet’s take a look at a demonstration...
11 Metallic BondingConsist of the attraction of free-floating valence electrons for the positively charged metal cationsThese electrons are floating around the cationsThese moving electrons effect the physical and chemical properties of metals
12 Metallic Bonding cont’d. Metals can change shape because of electrons surrounding the ionsExample: ductilityIonic crystals break in “cleavage plains” because particles of the same charge come near each other, thus repelling one another
13 Metals and Electrical Conductivity Metals conduct electricity because electrons are passed from one end of the metal to anotherAs e- are added to one end of the metal, more e- are leaving at the other end of the metal
14 Shapes of Metals Body-centered cubic Face-centered cubic every atom has 8 neighborsFace-centered cubicevery atom has 12 neighborsHexagonal close-packedevery atom has 12 neighbors, but different arrangement from Face-centeredPage Fig
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