wk3_apqxnsans[1]

wk3_apqxnsans[1] - 2007 Exam Instructions for Question 4...

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2007 Exam Instructions for Question 4 (Note: in 2007, only three reactions will appear. These are the eight from 2006 re-written.) Example: A strip of magnesium is added to a solution of silver nitrate. (i) Mg + 2 Ag + Mg 2+ + 2 Ag (ii) Which substance is oxidized in the reaction? Magnesium metal (Mg) a) Solid potassium chlorate is strongly heated resulting in a change in the oxidation numbers of both chlorine and oxygen. (i) 2 KClO 3 2 KCl + 3 O 2 (ii) What is the oxidation number of chlorine before and after the reaction? Chlorine has an oxidation number of +5 in KClO 3 and -1 in KCl b) Solid silver chloride is added to a solution of concentrated hydrochloric acid forming a complex ion. (i) AgCl + Cl - [AgCl 2 ] - (ii) Which species acts as a Lewis base in the reaction? Explain. The chloride acts as a Lewis base in the reaction; it donates an electron pair in the reaction. c) A solution of ethanoic (acetic) acid is added to a solution of barium hydroxide. (i)
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wk3_apqxnsans[1] - 2007 Exam Instructions for Question 4...

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