Assignment 5 2010 - 4. (10 points) Determine whether the...

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2010 Chemistry 2353 Assignment 5 1.(3 points ) a)Give an example of  a) an ionic hydride b) a metallic hydride c) a covalent hydride   2. Using the Pourbaix diagram for sulphur (above) extracted from our text (Fig. 8.8, p179 Rahner-Canham), (a)  (1 point)  Identify the thermodynamically preferred sulfur species at pH 4.0 and E of 0.1V?  (b)  (1 point)  To what reaction does the vertical line at ca. pH2 correspond? (c)  (2 point)  What does the grey area on this figure represent and why are sulphur species not labelled in this reation? 3.  (6 points)  Below are the Frost diagrams for nitrogen and phosphorus species in acidic conditions.  Identify two nitrogen species that are  unstable with respect to disproportionation,  and identify the disproportionation products and write the balanced net reaction in each case.
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Unformatted text preview: 4. (10 points) Determine whether the theoretical cesium (II) fluoride will spontaneously decompose into cesium fluoride: CsF 2 (s) CsF(s) + F 2 (g) by first determining the H o f for CsF 2 (s) (Cs(s) + F 2 (g) CsF 2 (s)) using a Born Haber cycle and the following data, as needed: Lattice energy for CsF 2 is 2250 kJ mol-1 ; Cs 1 st IE 382 kJ mol-1 ; Cs 2 nd IE 2430 kJ mol-1 ; Bond energy of F 2 = 155 kJ mol-1 ; EA of F is -328 kJ mol-1 ; Cs(g) H o f = 76 kJ mol-1 ; CsF(s) H o f = -554 kJ mol-1 . 5. (2 points) For the alkaline earth metals (except Be) which will have the most insoluble hydroxide? Why?...
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Assignment 5 2010 - 4. (10 points) Determine whether the...

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