7
5.3 questions ms  1. (a) gains electrons (1) 1  [1]  2. (a) (i) Fe 2+ 1 (ii) F 2 O 1 (iii) Fe 2+ 1 Cl  – 1 Use list principle if more than two answers (b) (i) e.m.f. = E (rhs) – E (lhs) 1 = 1.52 – 0.77 = 0.75 (0.75 scores first mark also) 1 (ii) Fe 2+  → Fe 3+  + e  – 1 (iii) ecrease 1 (Increase is CE, no further marks) !"#ilibri#m (or reaction) shifts to $ 1 (or L if refers to half equation in tale) (or in fa!our of more "e #$  ) (or more "e #$  forme%) (or more electrons forme%) !lectro%e &otential (for Fe 3+ 'Fe 2+ ) less &ositie (or  %ecreases) 1 [10] 3. (a) Fe 2+  or Fe() 1 (b) (i) * or () 1 (ii) 3 or () 1 (c) (i) 0.5 1 (ii) 2,n 2+  + - 2 O + 5/ 2 O  – 2 -  → 10/O  – 2 0  + 2,nO  – 0  + 1* + oth /O  – 2 0  an% ,nO  – 0  on right 1 alance% 1 [13] 4. (a) (i) 0.*0 1 (ii)  – 2 0 3 2 2  2e 0. /O /O . O .  + + → +  + 1  Mill Hill High School 1

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