TERM NUGGEST part 1

Mondae 23/6
GP H1 0900-1030
GSC H1 1300-1540
Chinese H1 1300-1600
Tuesdae 24/6
Math H2 0900-1030
Chem H2 1300-1430
Wednesdae 25/6
Econs H1 0815-0915
Geog H1 1300-1400
Thursdae 26/6
Bio H2 0815-0945
Lit H1 1300-1530
Fridae 27/6
TSD H2 0815-1015
Phy H1 0815-0945
Mondae 30/6
Hist H1 0900-1030
CSE H1 1230-1330

hi people

hi people.
seeing how absolutely around the corner terms are.
ur dearest and sweetest acl has decided to help u in ur revision!!
weeeee!
hahahaha
(but actually thats cos im freaking bored)

so this is an incentive for those who visits class blog dutifully & frequently & v weak in chem
ok here are basically some stuff that she might not have gone through in class

1. COVALENT BONDING WITH 2ND ROW ELEMENTS
- elements with 1 to 4 electrons in their valence shells form the same no. of covalent bonds as
the no. of valence shell electrons
- elements of 2nd period with more than 4 electrons in their outer shells form (8-n), whereby
n=no. of valence shell electrons

this is because elements of the 2nd row of periodic table have 4 orbiatls in their valence shell (2S, 2Px, 2Py, 2Pz) <--- note: only 8 electrons in valence shell, hence cannot accomodate more than 4 pairs of electrons

2. COVALENT BONDING WITH 3RD ROW ELEMENTS
- 3rd & subsequent rows can utilise their d orbitals in bonding as well as s and p orbitals (3s, 3p,3d) <--- note can have 18 electrons in valence shell (2n^2), hence can form more than 4 covalent bonds to other atoms

3. lone pair is an area of -ve charge & thurs forms the delta -ve end of a dipole

4. Isoelectronic molecules & ions
-Definition: has same no. of electrons, same no. of bonded & non-bonded electron pairs in their
valence shells
- Isoelectronic molecules/ons all have same basic shape & identical bond angles

5. Double bond: 4 electrons in this bond count as one group of electrons (used in VESPR)

the above information is reliable to a certain extent
cos it comes from our chem txt book.
i.e. Chemistry for advanced level by peter cann & peter hughes

so yes. i hope that this helps u guys alot!
all the best for terms!
and may u guys score especially well for chem!! :DDDD

~XOXO jia :D