12CHM11509 full lecture

12CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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Unformatted text preview: CHM 115 Dr. Hilkka Kenttmaa Lecture 12 Reading was 9.5-9.6, 9.8-9.9: Chemical Bonding Lecture 13: 9.7: Molecular Shapes Next lab: Does Human Breathing Contribute to Global Warming Last Lecture 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 Last Lecture A covalent bond involves the sharing of one or more pairs of electrons between two atoms. The balance between electron/nuclear attractions and repulsions determines the length and strength of a covalent bond. Bond strength and length are related to the bond order . Bond energies (strengths) can be used to determine the approximate enthalpy change for chemical reactions. Question # 1: Which of these has the strongest sulfur-nitrogen bond? (lone pairs indicated by lines) I I I I I I I I I I I _ _ _ _ _ _ _ _ _ _ _ I I I Today Know how to draw Lewis structures for molecules and ions. Predict molecules that will demonstrate resonance . Know how to calculate a formal charge for a molecule or ion Lewis structures the atoms in a molecule or covalent ion what atoms are bound to each other the location and type of bonds the location of lone pairs How to draw Lewis Structures CH 3 Cl How to draw Lewis Structures 1) Determine the central atom (the one that can form most bonds; not H): CH 3 Cl C 2)...
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12CHM11509 full lecture - CHM 115 Dr. Hilkka Kenttmaa...

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