Chemistry > MARK SCHEME > GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2020 Version: 1.0 Final (All)

GCSE COMBINED SCIENCE: TRILOGY 8464/C/2H Chemistry Paper 2H Mark scheme June 2020 Version: 1.0 Final Mark Scheme

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MARK SCHEME – GCSE COMBINED SCIENCE: TRILOGY – 8464/C/2H – JUNE 2020 7 Question Answers Extra information Mark AO / Spec. Ref. 01.1 C3H8 + 5 O2 → 3 CO2 + 4 H2O allow multiples 1 AO2 5.1... .1.1 5.7.1.3 01.2 (bubble gas through) lime water turns milky / cloudy / white or white precipitate forms MP2 is dependent upon correct response in MP1 allow (bubble gas through) calcium hydroxide (solution) 1 1 AO1.2 5.8.2.3 01.3 C3H6 1 AO2 5.1.1.1 5.7.1.4 01.4 burning / lit splint burns with a (squeaky) pop sound MP2 is dependent upon correct response in MP1 allow flame do not accept glowing splint allow pops 1 1 AO1 5.8.2.1 01.5 bromine (water) (colour change) orange (to) colourless do not accept bromide allow 1 mark for colourless (to) orange ignore clear 1 1 1 AO1 5.7.1.4 Total 9 MARK SCHEME – GCSE COMBINED SCIENCE: TRILOGY – 8464/C/2H – JUNE 2020 8 Question Answers Mark AO / Spec. Ref. 02.1 Level 3: The method would lead to the production of a valid outcome. All key steps are identified and logically sequenced. 5–6 AO3 5.6.1.2 Level 2: The method would not necessarily lead to a valid outcome. Most steps are identified, but the plan is not fully logically sequenced. 3–4 Level 1: The method would not lead to a valid outcome. Some relevant steps are identified, but links are not made clear. 1–2 No relevant content 0 Indicative content: • use a measuring cylinder / pipette / burette to measure 50 cm3 of sodium thiosulfate • use a different measuring cylinder / pipette / burette to measure 10 cm3 of hydrochloric acid • start the timer when the acid is added • record the temperature of the solution after the acid is added • stop the timer when the cross is no longer visible • record the temperature of the solution at the end of the reaction • calculate the mean temperature o [Show More]

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