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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: 0rion on March 04, 2009, 09:41:06 PM

Title: Help with some easy chemistry questions.
Post by: 0rion on March 04, 2009, 09:41:06 PM

Hey guys

So i am working on this new online system called WileyPLUS and so far its full of crap. (I think)

Heres the questions...
Which of the following are diatomic?

NO2
AsH3
CaO
Cl2
NaNO3
HBr

I answered Cl2 and HBr on my first attempt and it marked me wrong.
And then on my second attempt i put just Cl2 and it marked me wrong again...
chemistry boffs... what is the correct answer?

Oh and is the chemical formula for Manganese (II) acetate this...?
Mn(CH3OO)2
Cos it told me that was wrong too!
Thanks
CuCl2

Title: Re: Help with some easy chemistry questions.
Post by: macman104 on March 04, 2009, 09:45:18 PM

Unfortunately, the system is not crap.  You're close on both answers, but not quite there.

Reconsider the first question, they are not asking for elements that exists as diatomics like Cl2 (the ones in BrINClHOF).  Consider the literal definition of diatomic, you are actually not selecting enough answers.

Your second answer is wrong.  CH3OO is not acetate.  Close, but not quite.

Title: Re: Help with some easy chemistry questions.
Post by: 0rion on March 04, 2009, 09:47:28 PM

oh crap thats a typo.

Mn(CH3COO)2

hmm so i take it CaO is diatomic

Title: Re: Help with some easy chemistry questions.
Post by: 0rion on March 04, 2009, 09:50:45 PM

Classify the following compounds ionic or not ionic Write the formulas of each compound.
   
   
  X  Incorrect.
    
manganese(II) acetate
Classification:

ionic
Formula:  Mn(CH3COO)2

Thats pasted from the site... did i miss something?  :-\

Title: Re: Help with some easy chemistry questions.
Post by: nj_bartel on March 04, 2009, 10:48:01 PM

the bonding atom for acetate is oxygen

Title: Re: Help with some easy chemistry questions.
Post by: macman104 on March 04, 2009, 11:43:48 PM

Quote from: nj_bartel on March 04, 2009, 10:48:01 PM

the bonding atom for acetate is oxygen

I will be willing to call the program dumb if it requires that - being Mn(OCOCH3)2

Title: Re: Help with some easy chemistry questions.
Post by: 0rion on March 05, 2009, 12:14:52 AM

I think i worked it out, im pretty sure the answer it wanted was MnC4H6O4 :S thanks for your help guys

Title: Re: Help with some easy chemistry questions.
Post by: nj_bartel on March 05, 2009, 12:30:24 AM

Quote from: macman104 on March 04, 2009, 11:43:48 PM

Quote from: nj_bartel on March 04, 2009, 10:48:01 PM

the bonding atom for acetate is oxygen

I will be willing to call the program dumb if it requires that - being Mn(OCOCH3)2

I may have misread what he copy pasted.  That wasn't what I was implying.

Title: Re: Help with some easy chemistry questions.
Post by: macman104 on March 05, 2009, 01:07:26 AM

Oh, I thought you were saying he needed to rearrange it to show the bonding.  So...what did you mean then? lol

Title: Re: Help with some easy chemistry questions.
Post by: nj_bartel on March 05, 2009, 01:18:16 AM

I read it as the site was giving him the correct answer, and he was confused as to why it was that way - so I was attempting to explain the high electronegativity difference that could lead Mn(OAc)2 to be an ionic compound.