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OCR A-level Chemistry B (Salters) Paper 1 - 10th June 2025 [Exam Chat]

Reply 40

catsforever1154

10

Original post

by veuofn

for the ln k q. sis u do ln4.777-ln3.46… or did u have to do som else to it

I think you were given ln k so didn't have to ln them but otherwise yes

Reply 41

veuofn

8

is there an unofficial make scheme?

Reply 42

sfuoieoiefhse

12

Was the answer for the activation energy one 51

Reply 43

Asdf23

7

What did you guys get for the lattice enthalpy 4 marker

Reply 44

bran747

8

I got 0.124kj for the activation energy

Reply 45

HR07

1

Original post

by sfuoieoiefhse

Was the answer for the activation energy one 51

I got this so I hope so 🤞

Reply 46

veuofn

8

was the enthlapy change of sol liek 25? the Q=mcT. The 4 marker w the NH4NO3

(edited 8 months ago)

Reply 47

staarrrr223

11

Original post

by veuofn

is there an unofficial make scheme?

Not unless someone makes one

Reply 48

veuofn

8

which was the conjugated acid

Reply 49

HR07

1

What was the conjugate acid for the phosphate buffer? Got so confused

Reply 50

veuofn

8

Original post

by HR07

What was the conjugate acid for the phosphate buffer? Got so confused

i said H+ but idk if that’s correct

Reply 51

lov3r_tv

1

Original post

by HR07

What was the conjugate acid for the phosphate buffer? Got so confused

i just added a h+ to whatever it gave you

Reply 52

veuofn

8

for the butan-1-ok and butan-2-ol was the answer that’s the double bind can form on carbon 2 or 1 for butan -2-ol. Som along the lines

Reply 53

chemmlover4eva

9

Original post

by veuofn

what did u say for fats q. I said closer together. Stronger London Forces. More energy needed to break

i dont think they accept london forces on ocr b.. not sure though,i said Solid fats are saturated while vegetable oils are unsaturated . Saturated fats have no C=C double bonds, so their hydrocarbon chains are sttraigh, not kinked. This allows more points of contact, leading to stronger/more instantaneous dipole–induced dipole bonds formed so more energy is needed to overcome these forces

Reply 54

lov3r_tv

1

Original post

by veuofn

was the enthlapy change of sol liek 25? the Q=mcT. The 4 marker w the NH4NO3

yeah i got like 23 for the 4 marker and 25 for the one marker on the next page

Reply 55

buzzjen1

5

Original post

by Talkative Toad

OCR A-Level Chemistry B (Salters) Paper 1: Fundamentals of chemistry (H433/01) - Tuesday 10th June 2025 [Exam Chat]
Welcome to the exam discussion thread for this exam.
Introduce yourself! Let others know what you're aiming for in your exams, what you are struggling with in your revision or anything else.
Wishing you all the best of luck. :yy:

General Information
Date/Time: Tuesday 10th June 2025 AM
Length: 2h 15m
Good luck!
Click here to find exam discussions for other A-level subjects

how was the test today guys

Reply 56

buzzjen1

5

Original post

by Talkative Toad

OCR A-Level Chemistry B (Salters) Paper 1: Fundamentals of chemistry (H433/01) - Tuesday 10th June 2025 [Exam Chat]
Welcome to the exam discussion thread for this exam.
Introduce yourself! Let others know what you're aiming for in your exams, what you are struggling with in your revision or anything else.
Wishing you all the best of luck. :yy: