i need help (1 Viewer)

[abdooooo!!!]

explain why biodegradable substances offer a solution to environmental pollution?

its 4 marks, it needs 2 reasons.

so any hsc sites... i lost my favourites

thanks

 

[victorling]

umm...
*it degrades itself without the need of artificial means.For example,cetain bacteria and fungi in nature can break down the polypeptide bonds of the plastic.This avoids the need to degrade the plastic manually and reduces costs, also reduces the pressure exerted onto the environment, as the plastic can now degrade itself, breaking down into basic units that can be used by microorganisms, thus reduces the need for cleaning the debris

sorry, it is messy
but it says some reasons

 

[abdooooo!!!]

okays, thanks victor

hey just one thing on that, why do they need to be broken down at the first place? taking too much space? killing animals like them beer packs with the fish?

 

[victorling]

Originally posted by abdooooo!!!
okays, thanks victor

hey just one thing on that, why do they need to be broken down at the first place? taking too much space? killing animals like them beer packs with the fish?

yes
they are waste already, therefore they face treatment such as decomposition, to reduce space( which helps to look more aesthetically attractive), to eliminate the threat of choking animals if they are deposed in nature, also , prevetning from their accumulation on water surface which can cause drastic outcome such as suffocation of marine lives, due to the blockage of sunlight that deters normal photosynthesis and phytoplankton

 

[xiao1985]

Originally posted by victorling
... ,cetain bacteria and fungi in nature can break down the polypeptide bonds of the plastic.

dun meant to be pedantic, but i fink only biopolymers are biodegradable (can be borken down by bacteria and fungi)... the biopolymer dat possess a polypeptide chain should be nylon(6,6), which is mroe lyk a synthesis fiber...

 

[victorling]

xiao
he is talking about biodegradable polymers

 

[victorling]

not about whether it is biopolymer or artificial polmer
only biodegradibility is concerned here

 

[abdooooo!!!]

lol. don't worry you people... i just need environmental reasons... the chemistry side is covered.

 

[victorling]

okay

 

[xiao1985]

lolz, kz kz... soz for the interruption=D

 

[victorling]

Originally posted by xiao1985
lolz, kz kz... soz for the interruption=D

it is alright
hehe
u were not interrupting

 

[victorling]

hope these websites would be of some help:
www.worldwise.com/biodegradable.html
www.ianr.unl.edu/ianr/iapc/biodegradable_polymer.htm
www.wired.com/news/technology/0,1282,51871,00.html
www.phy.bris.ac.uk/research/ polymers/biodegradable.html

 

[abdooooo!!!]

ok thanks mate.

im gonna make another thread with some more questions... on biopolymers.