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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Collin Li on October 21, 2007, 02:10:40 am

Title: Ligands: the swindle of VCE
Post by: Collin Li on October 21, 2007, 02:10:40 am
Don't get me wrong, there are many swindles and cop-outs in VCE. Skipping necessary details, oversimplifying of ideas... but how VCE covers ligands is absolutely the worst of the worst.

Warning: If you learn anything here, you might answer your VCE questions incorrectly!

Ligands are actually covalent bonds! But you might ask: wait, covalent bonds are bonds between non-metals only! Incorrect: covalent bonds are any bond that involves the sharing of electrons in some sort of molecular orbital.

In any molecule, there will be molecular orbitals that do not correspond to the orbitals found in the model of the atom you studied in Unit 4. At a bond in between two atoms, orbitals of each atom overlap and either constructively interfere to form a bond, or destructively interfere to form an anti-bond (essentially no bond/interaction occurs)

Ligands are electron-rich species that can donate a pair of electrons to form a covalent bond. This is favourable, as cations are electrophiles (love electrons)

Thank you for allowing me to release a bit of knowledge about this, while also helping me revise. I hope it sparked some interest into the mystery and fun of chemistry. But for now, I suggest you quickly brainwash yourself and eat the following lie.

What you need to know for VCE
<lie>
Ligands are ion-dipole or ion-ion interactions (depends whether the ligand is an "ion" or a "dipole")
</lie>
Title: Ligands: the swindle of VCE
Post by: BA22 on October 21, 2007, 03:24:52 pm
meh, stupid course anyway,

the new 1/2/3/4 course is much better
Title: Ligands: the swindle of VCE
Post by: Sheikh05 on October 21, 2007, 07:23:45 pm
My brain. My sweet, virgin brain.
Title: Ligands: the swindle of VCE
Post by: rustic_metal on October 21, 2007, 07:37:05 pm
Quote from: "BA22"
meh, stupid course anyway,

the new 1/2/3/4 course is much better

it had better be.  :(
Title: Ligands: the swindle of VCE
Post by: Khangfu on October 21, 2007, 08:20:36 pm
SEcRETS AND LIES *

 Hugs year 12 text book "You won't lie to me right?"

It replies: Don't worry Coblin won't hurt you anymore XD

Rofl why on earth did VCE even suggest it was ion diple bond in the first place and not just tell us the truth.
Title: Ligands: the swindle of VCE
Post by: rustic_metal on October 21, 2007, 11:08:41 pm
i guess its the same principle as telling us we cant solve equations with negative discriminants before we learn about complex numbers. not that i agree with what they did with chem, its still absolute bullshit lol
Title: Ligands: the swindle of VCE
Post by: Collin Li on October 23, 2007, 06:40:15 am
Quote from: "rustic_metal"
i guess its the same principle as telling us we cant solve equations with negative discriminants before we learn about complex numbers. not that i agree with what they did with chem, its still absolute bullshit lol


Yeah, what you did wasn't a lie, as long as your teacher said "no solutions in R"

If it was just "no solutions" I'd whack him/her with a trout and other stuff.
Title: Ligands: the swindle of VCE
Post by: rustic_metal on October 23, 2007, 08:49:02 pm
my teacher is immune to trout and trout-related punishments.
Title: Ligands: the swindle of VCE
Post by: hifer on November 02, 2007, 07:00:12 pm
Hi guys, can you give me ur opinions on this:

Would you call a CN-(cynide) ligand as Ion-dipole or Ion-ion(since it's a anion)?
Title: Ligands: the swindle of VCE
Post by: ninwa on November 02, 2007, 07:03:47 pm
CN anion + central transition metal cation = ionic bond

in 3/4 chem terms anyways.

im ignoring coblin's explanation:P