Lecture 19 (10am) Chapter 9 and Chapter 10 November 6 2009

Lecture 19 (10am) Chapter 9 and Chapter 10 November 6 2009...

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Chapter 9 continued Lecture 19 November 6, 2009
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Select the strongest bond of the following: (A) C—O (B) C—N (C) C=O (D) C—F (E) H—F
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Bond Bond Energy C—H 413 kJ/mol C==O 799 kJ/mol O==O 498 kJ/mol H—O 467 kJ/mol Calculate the value of H (in kJ) for the reaction CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O (g) A. 1112 kJ of heat absorbed B. 818 kJ of heat absorbed C. 1112 kJ of heat evolved D. 818 kJ of heat evolved E. 382 kJ of heat evolved
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What is the energy liberated in this reaction? H 2 (g) + Cl 2 (g)→ 2HCl (g) Bond Energy (kJ/mol) H—H 431 H—Cl 427 Cl—Cl 239 (A) 496 kJ (B) 248 kJ (C) 923 kJ (D) 1529 kJ (E) 184 kJ
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Electronegativity
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Follow this link to view a “movie” on the electronegativity periodic trends: http://wps.prenhall.com/wps/media/objects/603/617961/Electronegativity.html
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Which element will have the largest electronegativity value? (A) Kr (B) Br (C) Rb (D) I (E) As
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Arrange phosphorus, magnesium, nitrogen and potassium in order of decreasing electronegativity
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Unformatted text preview: A. P > N > Mg > K B. N > P > K > Mg C. P > N > K > Mg D. N > P > Mg > K E. None of these orders is correct. Bond Polarity Select the least polar bond from the bonds listed below: A. S–Cl B. C–Cl C. O–Cl D. Si–Cl E. H–Cl In which of these substances are the atoms held together by polar covalent bonding? A. H 2 B. CuF 2 C. KBr D. SF 4 E. LiCl Metallic Bonding: electron sea model Chapter 10 Lewis Structures (octet rule) C N O F B A l G a In S i P S C l Ge As Se Br H Li B e Mg N a K C a When I converted this file, some of the element symbols were corrupted – yes, there is no element “aK” (Check your periodic table to correct this.) Steps for determining Lewis Structures for molecules that contain atoms that obey the octet rule Step 1: Place atoms relative to each other Step 2: Determine the total number of valence electrons available...
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Lecture 19 (10am) Chapter 9 and Chapter 10 November 6 2009...

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