Form 5........ bring it on

yo, after a long week at MSSS squash (haha, i know, i find it hard to belief it also, nerd at MSSS), i'm finally got back to school and study...... then it starts with moral... i could pulled it off la... but then add maths....... is was something like this

2.2e (iii) The use of halogens in herbicides and pesticides
PVC used as electrical insulator -[-CH₂-CHCl-]_n- The C-Cl bond is strong so PVC insulation lasts a long time but when discarded it does not rot (it is not biodegradable)

Freon 12 CF₂Cl₂ is a refrigerant and an example of a chlorofluorcarbon (CFC). The C-F and C-Cl bonds are very strong. The result is that it does not decompose easily so lasts for the lifetime of a refrigerator. It does not decompose quickly when discarded but does so in the upper atmosphere. The radicals it forms react with ozone. The loss of ozone leads to an increase in UV radiation reaching the Earth's surface and a corresponding increase in skin cancers in humans.

DDT is an pesticide used to kill mosquitos.
CCl₃
|
Cl-C₆H₅-C-C₆H₅-Cl
|
H
The strong C-Cl bonds give DDT a long life in the field killing pests. It is however so long lived that it persists in the environment and builds up in the food chain threatening creatures at the top of the chain.
Task 2.2eiii Describe and explain any advantages and environmental problems associated with using the herbicide called 2,2,3-trichloropropanoic acid.
Pentachlo

walao......... i totally lost........ after i thought it could be better...... physics ma.. one of my quite good subject........ but guess wat... it didnt... haiz

but it didnt get better k... it was like fire is related to the circuit....... huh???

i guess in thye end of the day, this is 17 years old TEENAGERS all about la..... so form 5, bring it on man!!! haha... teenagers guys........ and lets see how far we come.......

love you guys man,and to chun yen....... i dam proud of you man.....