Inorganic Mistakes Flashcards
To EXPLAIN why sc and zn aren’t transition elements, what to say after showing their electron config
Need to explain how these aren’t partial d orbitals, can’t just say
- so for sc say it doesn’t even have a d sub shell
- and for zn say it has a compelslty full d sub shell
Thus they can’t both be transition elements
When it says predict the products of somehtinf , and you use electrode potentials , what to check again with the product of one thing
Check the product of one thing doesn’t have any more electrode equations.
- but off it does, now check if that product will react again maybe
If it could be feasible show it AGAIN
If your two products end up being ions , what to do to show what product has been made!!
Must combine them and make them ONE COMPOUND, even if not balanced!
If you don’t know how a reaction like cr 3+ + 6NH3 could work (haven’t seen it before), what should you do
Write down the equation you DO KNOW, as this resvtion can’t happen
Write equation you do know , as no other equation can take place , only ones we learnt
Thus cr 6 water + 6 nh3 becomes cr 6 Ammonia and 6 water
Always explain COMPLETLEY for chem and physics, don’t scare from 1 marks so stop
For example for why conc ammonia, say that it won’t dissolve so that’s why, have to say all
You are trying to do equation Fecl2 —> FeCL3, we can’t just do that
It says fe cl2 reavts with Air, what SHOUKD YOU DO IF IT SAYS AIR
Air means oxygen !!
Look for the two electrode involving oxygen and fe 2+ to fe 3+ and manipulate those to get an equation
Remember FULL / OVERAL, EQUARION is ionic. What to do
Break all ionic compounds up and CANCEL, don’t try get lucky and hope full is on markscheme
Remember the max number of stereoisomers ( cis trans / optical) that can be formed in an octahedral complex ion
3 NOT 4
Two optical isomers, includes the cis isomer FLIPPED
And then one trans isomer
Don’t lack
Also in complex form with water if it changes colour then what happened to the complex ion ?
So badkally what colour would hexa water iron 2+ / 3+ show
Can think of the water ligands as an extension of the ion if they’re water/ ammonia,
Thus if fe 2+ hexa water will be PALE GREEN like Fe2+ is (this because the full extension of it is Fe 6 water!)
Similarly Fe3+ water will be ORANGE BROWN as expected!!
So don’t lack, when these are with water ligands, they show SAME COLOURS!
When they ask you to make an EQUILBKRUM for comolex ions, and at different temperatures different things are happenign and they ask you to explain, how to obviously do this
Must say due TO THE EQUILIBIRUM , obviously only changing due to it and the tempertaures, don’t lack here, easy mark lost
Rememebr the enthalpy of reaction gives it for the MOALR QUANTITIES
Si divide through first to make it one mole on the left
Then multiply
