Road Map #5

[atlanta213]

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hey guys..

very top reaction on road map 5, I don't know why it says E1 product next to 2 methy 2 butene. Since CN- is strong base, I think it should be E2..

Any idea?

 

[Maygyver]

hey guys..

very top reaction on road map 5, I don't know why it says E1 product next to 2 methy 2 butene. Since CN- is strong base, I think it should be E2..

Any idea?

CN is not a strong base.

 

[atlanta213]

I know HCN is weak acid, then should CN be strong base??

 

[Maygyver]

I know HCN is weak acid, then should CN be strong base??

I thought that CN was a weak base. I guess it depends on your definition. Strong bases are generally found in the first 2 columns.

 

[osimsDDS]

btw the dead give away that its E1 on that road map is because its using heat...so whenever you see heat mixed with a base its safe to say its E1 over E2

 

[Maygyver]

btw the dead give away that its E1 on that road map is because its using heat...so whenever you see heat mixed with a base its safe to say its E1 over E2

That makes sense. I didn't have the question in front of me but I'm pretty sure CN is a weak base right?

 

[atlanta213]

I think it is strong base.🙂

 

[Glycogen]

Which atom would required the shortest wavelength photon to remove a single electron?

a.Mg
b.Si
c.P
d.S
e.Cl

A good conceptual Q,wanted to share it!

 

[Maygyver]

I think it is strong base.🙂

I think you need to study general chemistry concepts of strong bases and acids 😉

 

[shoombol tallah]

Which atom would required the shortest wavelength photon to remove a single electron?

a.Mg
b.Si
c.P
d.S
e.Cl

A good conceptual Q,wanted to share it!

is the answer e?

 

[Glycogen]

is the answer e?

Good job.Was not it good?
When I was doing it,I picked Mg without reading the Q.Thought,they are talking about ionization energy!!!
This is why we have to read the Q before answer it!!!
This is what I am not use to do!!!!
I hope you know the concept then.If you want I can explain it

 

[osimsDDS]

Which atom would required the shortest wavelength photon to remove a single electron?

a.Mg
b.Si
c.P
d.S
e.Cl

A good conceptual Q,wanted to share it!

Awesome question this is EXACTLY what would be on the DAT!!!

shortest wavelength = strongest energy!!!

So now we have to look at those atoms which hold their electrons the closest to their protons and more tightly!!!

Basically look at your periodic trends and as we move to the right across a period the atomic radius decreases (gets smaller) so it MUST be Cl

WOWWOWOW this question is soooo good

nice glycogen i like give me more im addicted

 

[osimsDDS]

thread just got hijacked haha

 

[shoombol tallah]

Good job.Was not it good?
When I was doing it,I picked Mg without reading the Q.Thought,they are talking about ionization energy!!!
This is why we have to read the Q before answer it!!!
This is what I am not use to do!!!!
I hope you know the concept then.If you want I can explain it

yeah really good question you have to read it carefully to see what they are asking for. My reasoning was that shortest wave length has the highest energy (E=hv , where energy and wavelength are proportional) So something that would require the shortest wavelength (high energy) would have the highest ionization energy 🙂 please post more if you have any 👍

 

[atlanta213]

I think you need to study general chemistry concepts of strong bases and acids 😉

I could be wrong. As far as i know, HCN is weak acid. Then, conjugated base of that is strong base.

I do not understand why you said that.

 

[Maygyver]

I could be wrong. As far as i know, HCN is weak acid. Then, conjugated base of that is strong base.

I do not understand why you said that.

Not all conjugate bases of weak acids are strong bases...they could also be middle of the line.

http://en.wikipedia.org/wiki/Base_(chemistry) There you go. Look at the strong bases section.

 

[nixon13]

😱can someone explain the shortest wavelength question to me please?

 

[PooyaH]

😱can someone explain the shortest wavelength question to me please?

Another way to remove electrons though is through photo ionization and this allows you to remove more strongly bound electrons first. Any electron can be removed providing the energy required is less than the photon energy. You can say that depending on the photon source, it should never be harder to remove a more weakly bound electron.But, the probability of ejecting particular electrons depends on how strongly the photons interact with particular electron orbital. A very high energy photon source let's say like an X-ray, has a very short wavelength and will actually interact with the inner electrons in which its orbital size is smaller. As Osims explained, the we have to look at the size of atomic radius of each choice, and see which one is the smallest in which it pulls it's electron more tightly! In this case Cl is the right answer!