5 Responses

1. Sean Chua

   31|Jul|2008 1

   Hi.

   Seems like many students are not answering this particular question on Organic Chemistry. Wonder why so…

   Let me keep the momentum going, especially for those that are waiting for any suggested answers.

   a) Name: methoxybutane
   Formula: CH3OC4H9

   bi) 30 degree Celsius
   ii) As molecule gets bigger, the hydrocarbon content increases, and more van der waals Intermolecular Forces of attraction between the molecules. More energy is required to break these forces, thus BPs increases.

   c) True, False, False, True

   d) C4H10O + 6O2 –> 4CO2 + 5H2O

   Hope this suggested answers help.

   Sean
   Master Trainer
   www.SimpleChemConcepts.com

2. JO.

   02|Aug|2008 2

   Hello.
   thank you for the suggested answers.
   i was wondering if 38.8 deg C is acceptable for 6bi.
   thanks.

3. sean

   05|Aug|2008 3

   Hi Jo.

   That should be fine. It still falls within the range of acceptable answers.

   Keep up the spirit!

   Sean

4. Sivvy

   10|Aug|2008 4

   Hey Sir,
   Just wondering;
   How do you derive at 30 degree celsius for your answer to part (bi)?
   Because I happened to calculate my answer to be 38.8 degrees.

   For part (bii), is it acceptable to say that the boiling points increase due
   to the presence of more carbon atoms?

   For part (d), could you explain how you get the answer? Pleaseeeeeeeee?
   I don’t even know how to work it out! :/

   Thanks for your help,
   Really really appreciate it (;

   Cheers,
   Sivvy.

5. sean

   18|Aug|2008 5

   Hi Sivvy,

   Your answer 38.8 degree Celsius is a good acceptable answer.

   For part bii) just saying more carbon atoms is not good enough thou. You need to mention that the intermolecular forces of attraction increases as Carbon length increases.

   For Part d), you need to sum up all the C, H and O atoms together. And for combustions of such organic compounds, containing only C, H and O, the 2 products must be H2O and CO2. Balance your equation from there and you will get the answer.

   Hope this helps.

   PS: Where are you from?

   PPS: Do write to me if you need more help.

   Cheer
   Sean
   Founder & Master Trainer
   SimpleChemConcepts.com