DAT Destroyer Chem #16

[nickh]

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Hi guys,

Just wondering for #16, is there a way to predict which one will be liquid at 25oC, or is it just something you will need to know?

Thanks for any help!
Nick

 

[nickh]

This is a 2014 DAT Destroyer btw 🙂

 

[DAT Destroyer]

Hi guys,

Just wondering for #16, is there a way to predict which one will be liquid at 25oC, or is it just something you will need to know?

Thanks for any help!
Nick

Phenols can occur as colorless liquids or white solids at room temperature. No, it is not possible to tell with certainty in most cases. Many exceptions do exist......but lets keep it simple,,,,,,,and say no ! For alkanes......the first 4 are gases,,,,,5 through 17 are liquids....and beyond that.....higher homologues are waxy solids.

Hope this helps and good luck in your studies and on the DAT....take care..Nancy

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[nickh]

Hey Nancy, thank you so much for the prompt reply. But I was reference to #16 in the chemistry section, but what you were referring to was #16 in organic chemistry 🙂

 

[DAT Destroyer]

Hey Nancy, thank you so much for the prompt reply. But I was reference to #16 in the chemistry section, but what you were referring to was #16 in organic chemistry 🙂

Oh, dear..sorry about that, will be back with a reply in a few minutes. On the General Chemistry not Orgo..LOL

 

[DAT Destroyer]

Hi

Hi guys,

Just wondering for #16, is there a way to predict which one will be liquid at 25oC, or is it just something you will need to know?

Thanks for any help!
Nick

Hi Nick,

Ok, now I have it..

Every chemistry student needs to simply learn this. Most will not be exposed to every element. Only 2 liquids exist at 25 Celsius...Mercury and Bromine

Hope that helps and good luck in your studies and on the DAT!

 

[nickh]

Thanks so much again 😀

 

[SyracuseOrange92]

Thanks from me too!! Good question nick

 

[DAT Destroyer]

Anytime Nick, feel free t

Thanks so much again 😀

o a

Thanks so much again 😀

Anytime Nick, glad I could help!

 

[discensdentibus]

If you get curious, this link is for a neat periodic table that you can see what states the elements are in at any temperature. I'm not suggesting to memorize it, but it might be something cool/relevant to check out.

 

[nickh]

Hey Nancy, sorry to bug you again, but would you be able to give me some tips on how to tell if a compound would form a double/triple bond verse having lone pairs?

For example, N2H4, how do I know it will just be N-N single bone with a lone pair of electron on each N rather than a N-N triple bond?

Thank you so much again! 😀

 

[DAT Destroyer]

Hey Nancy, sorry to bug you again, but would you be able to give me some tips on how to tell if a compound would form a double/triple bond verse having lone pairs?

For example, N2H4, how do I know it will just be N-N single bone with a lone pair of electron on each N rather than a N-N triple bond?

Thank you so much again! 😀

Nitrogen needs an octet,,,,,it cannot be electron deficient...and prefers to have 3 bonds and a lone electron pair.......In N2H4......first always assume a single bond.......then put in the hydrogens......now recall that Nitrogen needs a lone pair. If done correctly.....we see a single bond between N atoms.....2 Hydrogens on each N....and lone electron pairs on the N. In HCN.....try it. You will get a triple bond bt. the C and N....and H attached to the Carbon. The lone pair once again is on Nitrogen......Be wary of a Nitrogen with less than the octet......If N has 4 bonds,,,,it carries a positive sign.


Hope this helps....Nancy