Chemistry test on Naming tomorrow!

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Re: Chemistry test on Naming tomorrow!

Post  Oscar on Wed Dec 03, 2008 6:39 pm

Can someone explain me permanganate please Question (I don't have it in my notes)
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Re: Chemistry test on Naming tomorrow!

Post  Milla on Wed Dec 03, 2008 6:41 pm

MnOsub4 = permanganate and it has a negative charge

thats what i have in my notes!!
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Re: Chemistry test on Naming tomorrow!

Post  Oscar on Wed Dec 03, 2008 6:49 pm

Ohhh Ok it makes sense! Manganate (MnO3) is a ployatomic ion like chlorate and sulfate, and so when it gains an oxygen atom, it becomes MnO4 ...

Thanks Milla Very Happy
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Acids (again)

Post  ana on Wed Dec 03, 2008 8:52 pm

Ok... so how do I know when to put "hydro" in the beginning of the acid name and when not to?
ex from Rosu's quiz:
-Perchloric acid -Hydroflouric acid
how come one has it the other doesn't?
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Re: Chemistry test on Naming tomorrow!

Post  Oscar on Wed Dec 03, 2008 9:34 pm

Well, normally the symbol for hydroflouric acid would be like that => HF (aq)

when it is a liquid, there is(aq) in the symbol and you write hydro+(element)

When it is a gas, there is (g) in the symbol and you write hydrogen mono+(element)

To answer your question, the first acid in your post is a oxyacid, and the second is a binary acid, and
ONLY binary acids (HCl for example) have a liquid or gas state, and not oxyacids (H2SO4 for example)
I don't know the actual explanation about why oxyacids are not liquid nor gas, but only binary acids are.


Few examples Ms Rosu's handout to make it clearer as possible:

173. hydrobromic acid (binary acid, LIQUID (because hydro-) => HBr (aq)

HCl (g) [(g) so it is a GAS] hydrogen monochloride

I know it is CRAZY so if you don't understand please let me know Wink
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Re: Chemistry test on Naming tomorrow!

Post  Carlos on Thu Dec 04, 2008 6:51 pm

Ilaaaaaaaaaaaaaaaa

Passou o teste e agora é só alegria na aula de Rosu

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Re: Chemistry test on Naming tomorrow!

Post  Oscar on Thu Dec 04, 2008 9:33 pm

Well for the moment ...
She told it was the easy semester Suspect Shocked Laughing
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