Chemistry > MARK SCHEMES > AQA– A-level Chemistry – Specimen paper 2 Mark Scheme : Organic and Physical Chemistry (All)
AQA– A-level Chemistry – Specimen paper 2 Mark Scheme : Organic and Physical Chemistry
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Question Marking guidance Mark AO Comments 01.1 Consider experiments 1 and 2: [B constant] [A] increases × 3: rate increases by 32 therefore 2nd order with respect to A Consider experiments 2 a... nd 3: [A] increases × 2: rate should increase × 22 but only increases × 2 Therefore, halving [B] halves rate and so 1st order with respect to B Rate equation: rate = k[A]2 [B] 1 1 1 AO3 1a AO3 1a AO3 1b 01.2 rate = k [C]2 [D] therefore k = rate / [C]2 [D] 1 AO2h k = (1.9 10 ) (3.5 10 ) 7.2 10 2 2 2 -4 - - × × × × = 57.0 1 AO2h Allow consequential marking on incorrect transcription mol–2 dm+6 s –1 1 AO2h Any order 01.3 rate = 57.0 × (3.6 × 10–2 ) 2 × 5.4 × 10–2 = 3.99 × 10–3 (mol dm–3 s –1 ) OR Their k × (3.6 × 10–2 ) 2 × 5.4 × 10–2 [Show More]
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