2025-kisii-sch-chemistry-paper-1-marking-scheme_4
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DATE 07 Dec 2025
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Document Type: This is a Solution Set, designed for Verifying answers and correcting mistakes.
Context: Standard material from the 2025 academic period.
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CHEMISTRY PAPER 1 Marking Scheme 1(a) When air hole is completely/fully closed. (b) C4H10 (g) + 4O2 (g) Or C4H10 (g) + 3O2(g) C(s) + 3CO(g) + 5H2O(l) /(g) If filly/completely mentioned If not mentioned penalize fully 1Mrk No state penalize ½ Not balanced penalize fully Water can be liquid or gas. 1Mrk C(s)+CO2(g) + 5H2O(l)/ (g) (c) Unburnt Region 1/2 A diagram must be well labeled Mention burnt and not burnt region 1mrk Paper Charmed region 1/2 Or Slip a piece of paper across the middle point of the flame. Remove and observe ½ The central part remains unburnt while other part burns. 8(a) S, Hydrogen, V, T 2mrk (b) T(s) + V2+ (aq) V(s)+ T2+(aq) 1mrk 9 Crush the tablet with mortex and pistle ½, add water stir To dissolve ½, add the universal indicator ½ , match the Color with that of PH chart ½, determine the PH 1mrk.
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CHEMISTRY PAPER 1 Marking Scheme 1(a) When air hole is completely/fully closed. (b) C4H10 (g) + 4O2 (g) Or C4H10 (g) + 3O2(g) C(s) + 3CO(g) + 5H2O(l) /(g) If filly/completely mentioned If not mentioned penalize fully 1Mrk No state penalize ½ Not balanced penalize fully Water can be liquid or gas. 1Mrk C(s)+CO2(g) + 5H2O(l)/ (g) (c) Unburnt Region 1/2 A diagram must be well labeled Mention burnt and not burnt region 1mrk Paper Charmed region 1/2 Or Slip a piece of paper across the middle point of...
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