Tutorial 4 a - CHEM 1A03 TUTORIAL #4 Oct4 Oct. 9, 2009...

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CHEM 1A03 TUTORIAL #4 Oct4 – Oct. 9, 2009 Solutions – Chapter 10 _____________________________________________________________________ Page 1 of 9 The following problems (1-8) are based on material from Chapter 10 and class notes. 1. Arrange the following in terms of increasing electronegativity: (a) Mg, N, O, Si, (b) F, Se, Sn, Te (a) Mg < Si < N < O EN increases left to right across a period and bottom to (b) Sn < Te < Se < F top of a group. 2. For the following anions: SO 3 2- , CO 3 2- , NO 3 - , ClO 3 - , and ClO 2 - : a) Draw Lewis structures and resonance forms b) What are the average bond orders for the central-atom-to-oxygen bonds in these species? c) What is the average formal charge on the oxygen atoms in each of these species? d) Indicate whether the species is an exception to the octet rule (i.e. it has more than an octet of electrons around one of the atoms). e) Give the VSEPR AB n E m classes f) Predict the shapes of the anion. Note that the figures used to illustrate the shapes in point f) do not indicate the bond orders and the formal charges. SO 3 2- a) 26 valence electrons S O O O S O O O S O O O b) For SO 3 2- , the average bond order is 4/3. c) The average formal charge on oxygen in SO 3 2- is -2/3. d) The charge-minimized resonance structures do not follow the octet rule. e) AB 3 E f) triangular pyramidal S O O O
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CHEM 1A03 TUTORIAL #4 Oct4 – Oct. 9, 2009 Solutions – Chapter 10 _____________________________________________________________________ Page 2 of 9 CO 3 2- a) 24 valence electrons O C O O O C O O O C O O b) For CO 3 2- , the average bond order is 4/3. c) The average formal charge on oxygen in CO 3 2- is -2/3. d) The resonance structures do follow the octet rule. e) AB 3 f) triangular planar or trigonal planar OC O O NO 3 - a) 24 valence electrons O N O O O N O O O N O O b) For NO 3 - , the average bond order is 4/3. c) The average formal charge on oxygen in NO 3 - is -2/3. d) The resonance structures do follow the octet rule. e) AB 3 f) triangular planar or trigonal planar ON O O ClO 3 - a) 26 valence electrons Cl O O O Cl O O O Cl O O O b) For ClO 3 - , the average bond order is 5/3. c) The average formal charge on oxygen in ClO 3 - is -1/3. d) The charge-minimized resonance structures do not follow the octet rule. e) AB 3 E f) triangular pyramidal or trigonal pyramidal
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CHEM 1A03 TUTORIAL #4 Oct4 – Oct. 9, 2009 Solutions – Chapter 10 _____________________________________________________________________ Page 3 of 9 Cl O O O ClO 2 - a) 20 valence electrons Cl O O Cl O O b) For ClO 2 - , the average bond order is 3/2. c) The average formal charge on oxygen in ClO 2 - , is -1/2. d) The charge-minimized resonance structures do not follow the octet rule. e) AB 2 E 2 f) bent (or angular or v-shape) Cl O O 3. Oxalic acid, (COOH) 2 , has two ionizable hydrogens and contains a carbon-carbon single bond. When one mole of oxalic acid reacts with one mole of calcium hydroxide,Ca(OH) 2 , the salt CaC 2 O 4 is formed.
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Tutorial 4 a - CHEM 1A03 TUTORIAL #4 Oct4 Oct. 9, 2009...

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