11CHM11509 full lecture

11CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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Unformatted text preview: CHM 115 Dr. Hilkka Kenttmaa Lecture 11 Reading was 9.4-9.10: Chemical Bonding Lecture 12: 9.5-9.6, 9.8-9.9 Predicting Bonding Types Metal plus metal gives metallic Metal plus non-metal gives ionic Non-metal plus non-metal gives covalent Determining Composition of Compounds Na 2 O MgO Al 2 O 3 SiO 2 P 2 O 5 SO 3 Cl 2 O 7 NaF MgF 2 AlF 3 SiF 4 PF 5 SF 6 ClF 7 NaH MgH 2 AlH 3 SiH 4 PH 3 H 2 S HCl Number of dots = number of valence electrons Lewis electron-dot structures Lewis electron-dot structures For metals , number of dots = number of electrons it loses What is the Lewis structure for Ca? How many electrons does it tend to lose? For non-metals , the number of dots = number of electrons it can receive or share. What is the Lewis structure of O? How many electrons does it tend to gain? .. .. .. .. Mg Mg 2+ + 2 e- .. .. .. .. O + 2e- O 2- MgO Mg 2+ O 2- Questions # 1 and # 2 1. How many Lewis Dots should you write for Bi? A) 1 B) 2 C) 5 D) 8 2. Based on Lewis dots, what would you predict the formula would be for sodium/bismuth compound? A) NaBi B) Na 2 Bi C) Na 3 Bi D) Na 5 Bi Lewis electron-dot structures For metals , number of dots = number of electrons it loses What is the Lewis structure for Ca? How many electrons does it tend to lose? For non-metals , the number of dots = number of electrons it can receive or share. What is the Lewis structure of O? How many electrons does it tend to gain? .. .. .. .. Mg Mg 2+ + 2 e- .. .. .. .. O + 2e- O 2- Electron Sharing Transferring electrons creates ionic compounds: Sharing electrons creates covalent compounds: Closed shells Bonding pairs Non-bonding electrons Lone pairs ......
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11CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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