05S13

Sunday, July 10, 2005

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jus study smart..to study smart muz study hard..not too hard though ..understand ppl? lol

chemical bonding:

ionic bond-
strong electrostatic attration btn postive n negative entities (metal cation , non-metal anion)
giant ionic structure
factors affecting strength: *size of ion *charge of ion
LE =k [(a`x a')/(r`+r')]

metallic bond-
strong electrostatic attraction btn positive metal cations and a sea of mobile electrons surounding it
giant metallic structure
factors affecting strength: *no of valance elctrons *charge to size ratio

covalent bond-
strong electrostatic attraction btn positive nuclei of two atoms and the bonding electrons shared btn them
giant covalent structure/ simple covalent structure
bond strength(related to bond energy) affetced by: *no of bonding e *size of atom *bond polarity

dative covalebt bond:
single covalent bond in which two bonding electrons are contributed fr onli one atom
involves e donor (lone pair) n acceptor(empty orbital)

IMF:
VDW.van der waals' forces; PD-PD attraction , ID-ID attraction
-factors affecting: *no of electrons in molecule *surface area of molecule
H bonding; intermolecular , intramolecular
-criteria for existence: *one or more lone pair

H bonding (F,O,N) > PD-PD (polar molecules) > ID-ID (non-polar,random)

VSEPR theory : shape of molecules
-angles (180,90,109.5,107,104.5,120, sligthly less den 120)
-shape (linear, trigonal planar, tetrahedral, v-shaped,see- saw, t-shaped, trigonal pyramidal, trigonal bipyramidal, octahedral, square pyramidal, square planar)
- lonepair-lonepair repulsion > lonepair-bondpair repulsion > bondpair-bondpair repulsion

polarisation
btn 2 dif atoms (except P,S,C)
due to electronegativity
oso determined by shape of molecule (cancellation of dipole moments)

overlap of atomic orbitals
-head-on overlap (sigma bond)
-side-way overlap(pi bond)

hybridisation: orbitals used

phew..finally..done by: xiaohui

2:42:00 PM;

PROFILE

Class Info for Year 2006

Class rep: Qamarul
Vice Class rep: Chou Li
Treasurer: Kian Ping
GP rep: Wen Jun
PE rep: Yue Feng & Grace
Maths rep: Siti
Chinese rep: Kah Fong
Physics rep: Karthik
Chem rep: Aik Leng
AVA rep: Kok Swee
CIP rep: Chen Hui
Civics rep: Suguna

Members: Ze Lun, Benson, Xiao Hui, Bay Hung, Chen An, Subathra, Xian Hui, Fleur, Juan Juan, Jing Wen, Beryl, Yu Yan

Class Info for Year 2005

Class rep: Qamarul
Vice Class rep: Grace
Treasurer: Kian Ping
GP rep: Karthik
PE rep: Yu Yan & Siti
Maths rep: Xiao Hui
PW rep: Yue Feng
Chinese rep: Kah Fong
Physics rep: Bay Hung
Chem rep: Xian Hui
AVA rep: Kok Swee
CIP rep: Chen Hui
Civics rep: Suguna

Members: Wen Jun, Ze Lun, Benson, Aik Leng, Chen An, Subathra, Fleur, Juan Juan, Jing Wen, Beryl, Chou Li

LINKS

Wen Jun
Grace
Daniel
Chen Hui
Xiao Hui
Chou Li
Xian Hui
Jing Wen
Fleur
Kah Fong
Bay Hung
Suguna
Benson

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