Chemistry!!

1) So, yes OH has hydrogen bonding. It can Accept and Donate hydrogen bonds. Acids have C=OOH. So Hydrogen band Accept and donate. Also acids can dissociate to give COO^- which is much more polar than hydrogen bonding alone.

 

Esters can Accept, but not donate hydrogen bonds. As such they have some polar characteristics but are not nearly as polar as acids and alcohols. Unlike the acid and alcohol, the ester is not polar enough to dissolve in the water solution and as such it separates as a non-polar layer. This layer can sink or float depending on the density of the ester compared to water.

 

2) Hint: Most esters have well-known smells.

 

3) Think about what you just said, and think about how you could use that to relate to the questions they asked. For example, do any of the questions refer to water in any way? Science is not just about knowing and understanding test data, but about extrapolating it and applying it to real-world situations.

for 2 does it relate to bees?

and for 3 I'm still not sure, and it's due tomorrow.

also do you know the smell of octanol reacting with salicylic acid by any chance

thanks

and much help would be appreciated

For question 1, alcohols have and OH functional group, so they have hydrogen bonding making it dissolve in water (has a high solubility). I don't know what acids have? Esters have an O double bond c single bond O. So it dosnt have hydrogen bonding so it wont dissolve in water. But what does it have to do with floating?

For 2, all i know is esters have an o double bnd c single bond o. So I don't know what that has to do with flowers?

For 3, all I know is that esters don't have hydrogen bonds so they arent very polar, meaning they wont dissolve in water very well, but what does tha have to do with the questions.

Thanks.

1) Discuss the characteristic functional features found in the alohols and acids that is missing in the ester. Discuss how its presence or absence allows the reactants to dissolve well in water but limits the ability of the product to dissolve in water and therefore causes it to float on the cold water in the watch glass.

2) Esters are oten a key component of oils pesent in flowers. What purpose would the ester serve in flowers?

3) Why do flowers have less smellon rainy cool dyas ad why does the rain not wash the esters away? Why did weplce the ester on a cooled watch glass in the lab and not on your skin?

I have spend an hour researching these questions and have no clue. Can anyone help me?