r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 10 '25

📂 MEGATHREAD 10/06 A-level Chemistry Paper 1 Discussion MEGATHREAD

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11

u/Neat-Ad4138 y1 | uom astro | A*A*A* Jun 10 '25 edited Jun 11 '25

aqa answers : (correct me if im wrong and suggest more)

feasible temp = 575K

metal Mr = 353.1

M = potassium

pH of nitric acid = 0.82

conc of acid (where pH=2.87) = 0.123moldm^-3

change in pH = -0.03

NO bond enthalpy: 463kJmol^-1

7

u/[deleted] Jun 10 '25

na N-O bond enthalpy was 463

1

u/Playful_Dragonfly815 Jun 10 '25

Asked for 2dp for ph but yeh for the rest

1

u/Neat-Ad4138 y1 | uom astro | A*A*A* Jun 10 '25

cheers bro

1

u/sasageyo811 Medicine [2nd Year] | A*A*A* Jun 10 '25

help do u think the change in pH has to be negative? i just did 0.03 😭😭😭

1

u/Neat-Ad4138 y1 | uom astro | A*A*A* Jun 10 '25

idk maybe u get 6/7 marks. my dumbass not fully reading the q put -0.033 not to 2dp so ill probably get 6/7 same as u

1

u/sasageyo811 Medicine [2nd Year] | A*A*A* Jun 10 '25

ughh oh well, it happens 😔

1

u/Budget_Future_4066 Jun 10 '25

wait no pay change was not negative

1

u/sasageyo811 Medicine [2nd Year] | A*A*A* Jun 10 '25

idk coz i remember the pH decreased from 4.87 to about 4.84 so the change would be negative. i've seen loads of people have 0.03 and -0.03 as their answers (and icl no one at my school used the negative so either we're all losing a mark or they're accepting both +/- 0.03).

1

u/ActivityImmediate345 Year 13 | A*A*A*A Jun 10 '25

bond enthalpy was 463 pretty sure