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Physical Chemistry questions & Answers 100% Correct!! $15.49   Add to cart

Exam (elaborations)

Physical Chemistry questions & Answers 100% Correct!!

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  • Course
  • Physical Chemistry
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  • Physical Chemistry

Why might the emf of a cell be less than the standard electrode potential? - ANSWER Because concentration of Cu2+ is less than 1 mol dm-3 / less than standard equilibrium moves to left What is ammonia oxidised to? - ANSWER nitrogen Predict what you would see when aqueous sodium ferrate(VI...

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  • September 30, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Physical Chemistry
  • Physical Chemistry
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Physical Chemistry questions &
Answers 100% Correct!!

Why might the emf of a cell be less than the standard electrode potential? - ANSWER Because
concentration of Cu2+ is less than 1 mol dm-3 / less than standard

equilibrium moves to left



What is ammonia oxidised to? - ANSWER nitrogen



Predict what you would see when aqueous sodium ferrate(VI) is added to aqueous potassium iodide
- ANSWER iodine so a brown (solution) formed

Fe3+ formed which is yellow or orange

Fe2+ formed which is green



Describe a test to show the presence of iron(III) ions in a solution of FeSO4.7H2O. - ANSWER Add
aqueous sodium hydroxide which will give a brown/rusty ppt



Why would you remove excess copper before titrating iron with potassium manganate? - ANSWER
Copper may react with potassium manganate(VII)

iron(III) ions formed in titration may be reduced back to iron(II) ions by the copper



Explain why the H—O—H bond angle in the water ligand is 107° rather than 104.5°. - ANSWER
Water molecule has 2 lone pairs and 2 bonding pairs

Water ligand has 1 lone pair and 3 bonding pairs

Lone pairs repel more than bonding pairs



What is a complex ion? - ANSWER Central ion surrounded by ligands

An electron pair acceptor



What is a ligand? - ANSWER Molecule/ion with a lone pair of electrons

Able to form a dative covalent bond

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