Last minutes questions

[BigLazy]

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To some o chem. expert out there, here's a really late question that's been bugging me. What is usually considered a lewis acid and a lewis acid reaction. I know by definition it is a electron donor, but what type of molecules are considered electron donors? Is it molecules that have a lone pair? Someone please clarify.

 

[AxlxA]

Well according to that definition, the molecule has too much electron and wants to give them up. This is the same as a NUCLEOPHILE. so basically, most of those nucleophile we know of can be called lewis base too. ie: I-, Cl-, OH-

 

[CH3CH2OH]

Lewis acid: anything that accepts a pair of electrons
Lewis base: anything that donates a pair of electrons

this is the most general definition. i believe that all Arrhenius and B-L acids and bases fall into this definition as well.

acids include molecules that have an incomplete octet around the central atom (ex: AlCl3, BF3). also all simple cations except alkali and alkaline earth cations.

 

[BigLazy]

on the same note, I got this question from an old AAMC test
2HCl(aq) + Mg(s) --> MgCl2(aq) + H2(g)

is the above rxn considered an oxidation/reduction or lewis acid and base?

 

[Medikit]

on the same note, I got this question from an old AAMC test
2HCl(aq) + Mg(s) --> MgCl2(aq) + H2(g)

is the above rxn considered an oxidation/reduction or lewis acid and base?

Both

 

[05med05]

Ok, I've got a headache trying to get all these last minute questions straight in my mind before saturday. Regarding the question about distinguishing an acid/base, oxidation / reduction equation. Is there a set of rules to use to distinguish between them??

I think I had a similar question on a mock exam, but did not have the solutions...I think I guessed on the question... 😕

 

[BigLazy]

Ok, I've got a headache trying to get all these last minute questions straight in my mind before saturday. Regarding the question about distinguishing an acid/base, oxidation / reduction equation. Is there a set of rules to use to distinguish between them??

I think I had a similar question on a mock exam, but did not have the solutions...I think I guessed on the question... 😕

usually, if the atom changes oxidation state, it is consider an oxidation/reduction rxn.
I wonder what a typical lewis acid and base rxn looks like?

 

[mesoderm]

Lewis acid: anything that accepts a pair of electrons
Lewis base: anything that donates a pair of electrons

this is the most general definition. i believe that all Arrhenius and B-L acids and bases fall into this definition as well.

I thought B-L acids were proton donors and Arrhenius acids were compounds that dissociate to give H+ ions.

 

[xadmin]

That is a ox/red reaction. This is the best answer.