00:01
For number one, take note that the nature of individual atoms and the chemical bonds in organic molecules confers the properties of the non -polarity, the lipophilicity, and also the environmental bioavailability, and also mobility, and the resistance to degradation.
00:40
Note that in the following discussion, it is assumed that a chemical must be dissolved in water before it can be biocentric by aquatic organism.
00:50
First one, we have the polarity.
00:54
Take note that the presence of one or more polar functional groups in molecules, such as those in three acids and phenols, it will increase the water solubility.
01:14
Of a compound but it reduces its leopilicity on the other hand the lack of polar functional groups or the state of non polarity decreases the solubility of water of a chemical and increases the lipophilicity also decreasing the water solubility of a chemical hence escaping tendency from water by volatilization unless the molecular weight is relatively high, like greater than 350 daltons.
02:04
We have also the molecular size.
02:10
Increasing the molecular size of organic compounds generally results in higher lipophilicities or the kw for in that particular part and lower the solubility and lower the water solubilities.
02:44
For number two, the type of molecular size increase confers great bioaccumulation factors...