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AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

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Reply 1420

happi_minnie

does anyone put the marks scheme up like they do in the maths thred in the chemistry threads?

Reply 1421

king101

Original post by happi_minnie

does anyone put the marks scheme up like they do in the maths thred in the chemistry threads?

Don't think anyone really does a mark scheme for Chemistry

Reply 1422

ceeebs

COLLEGE/A-LEVELS/CHEMISTRY are officially over, I am so happpppppppppppppppppppppppppppppppppppppppppppppppppyyyyyyyyyyyyy :smile:

and the exam wasnt too bad either so I should be getting the A i worked SO hard for, for 2 years

Reply 1423

al_habib

Original post by Scaudwell

Fe 2+ ---> Fe 3+ + e-

Cr2O7 2- + 14H+ + 6e- ---> 2Cr 3+ + 7H2O

THEREFORE: 6Fe 2+ + Cr2O7 2- + 14H+ ---> 2Cr 3+ + 6Fe 3+ + 7H2O

That's how you get your ratio.

do you get a mark writing the equation coz i didnt finish the calc

Reply 1424

king101

Original post by al_habib

do you get a mark writing the equation coz i didnt finish the calc

Defiantly, probably two marks since it isn't really the most easiest equation. :smile:

Reply 1425

lou12

Original post by king101

I don't think it did simplify, was another "Just Learn" question.

cool thanks

Reply 1426

Black Butler

did anyone else put that the voltage of the cell decreases over time because KCL gets used up in the salt bridge?

Reply 1427

al_habib

Original post by king101

Defiantly, probably two marks since it isn't really the most easiest equation. :smile:

among the elements, which one was not a ligand- i put H was it right

Reply 1428

lou12

for one of the emf questions, did anyone reverse the direction of the reaction when writing out an equation. i can't remember what the question was now.