07S78-ade: April 2007
play around with the bounce circles. drag them round. jump on them. and more!

Friday, April 27, 2007
「 bouncing away 8:20 PM 」

Hey guys, this is the bio rep again with some bio announcements.

1. Remember to do your bio prac and hand it in on weds!
2. Bio test is on friday. Topics are cellular functions and photosynthesis (all of you probably know this already)
3. Please do the poll to indicate when you can make it for extra bio lessons. Results will be collated on sunday and the majority vote will be relayed to Mrs Tan so do vote by then.


Thanks and cheers. :D


Bouncing bouncing bouncing... off, POOF! ^.^

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Tuesday, April 24, 2007
「 bouncing away 10:24 PM 」

hi again..

since SOME people want their due recognition for their contribution (in one way or another) to my Converse bag i shall grant them their wish (happy? XD)

and adding on to the list of ppl whom i left out(in no particular order of merit/credit/fave frens):

Ryan
Da Xian
Jie Lun
Sheng Heng
Kevin
Cheryl
Olivia

...and the list probably goes on...

THANKS to anyone who has contributed in one way or another to the purchase of the birthday gift (so dun bug me for any other recognition o.O) hahaxxx okayz just kidding. But really... thanks a lot. =)

econs rep


P.S. To Da Xian: pls stop telling me i have special birthday rights on 23/4... zZz... i have human rights everyday too...


Bouncing bouncing bouncing... off, POOF! ^.^

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Monday, April 23, 2007
「 bouncing away 5:14 PM 」

Hey guys!!

Posting this msg to thank you guys for making 23/04/2007 such a special day for me. In fact, it has been the most special bdae i've had since i was born =) so you can see how happy i am.

Thanks to ryan for buying SUCH a BIG cake (2kg) ^^.

Thanks to ryan n jeelun n kevin n cheryl n other people (ryan told me but i forgot liaoz, sorry...) who bought me tat Converse bag. =)

[SPECIAL thanks to Da Xian who suggested the wording on the cake] <33

AND thanks to e whole class who wrote me that card.

I reeeeeaaaallllyyyy appreciate the stuff u guys did for my bdae =P


On a more serious note, please rmbr to do your econs tutorial 14 section A after mugging for chem test =)

derek a.k.a econs rep

Upload e pics soon somebody.


Bouncing bouncing bouncing... off, POOF! ^.^

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Sunday, April 22, 2007
「 bouncing away 9:38 PM 」

PEOPLE...... CHEM TEST IS ON TUES...dun listen to blur weiting...!!!! @Rachel: so yes we're not having chem test tmr... topics tested: chem bonding and 1 qn on gaseous law...


Bouncing bouncing bouncing... off, POOF! ^.^

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NOOOOOOO can we dun haf chem test tmr! So damn screwed larh. Whole fri n sat spent on oac n I haven started studying! Damn tired. x__x Ahhh pls spare me.

Yeah haven been blogging here for damn long, tink our blog's almost dead alr. Sigh anw omg wei ting mus u put my name in red font. So embarrassing. >.<

Went to watch the dance rehearsal for syf on fri. The girls r damn zai larh! Hahah shall reserve my comment for the guys though. Jiayou wei ting!! :D

[Rachel <33]


Bouncing bouncing bouncing... off, POOF! ^.^

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Thursday, April 19, 2007
「 bouncing away 8:11 PM 」

ok. so here to update!

RACHEL has accepted our request to be the fac princess nominee!! haha, sportyyyyyy! =))
yeah man, clap for our fac prince/princess for their enthusiasm and sportsmanship!!

it has been a busy week, but i believe next week will be busier, for me la. haha.
dun forget that we have a chem class test on monday! everyone pls study!! =))
bio and chem lecture tests are coming too, so if you have the time, MUG yeah!

ok enough of the academic details.

WHO'S GONNA COME DOWN TO SUPPORT MAD MODERN DANCE TMR?! RMB IT IS 5:00PM and 5:45PM, ATTEND EITHER ONE. yeahh, i can't really promise much, you have to be dere to judge for urself! haha, but i will put in my 100% =D

and ermm, dun expect too much gentleness from me in the dance. HAHA. you will noe wad i am toking abt if you attend the showcase at AUDI TMR. RMB IS THE AUDI! =))

btw, tmr u guys will be voting for the 34th Student Council's president! bring pen/pencil along for morning assembly yeah? try to spread the msg around.. =)) pls vote wisely, i am sure you guys noe wad to do. heh.

well, guess tats all for now.

WHEN IS JTS?


weiting


Bouncing bouncing bouncing... off, POOF! ^.^

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Tuesday, April 17, 2007
「 bouncing away 10:49 PM 」

EHH ppl~! class blog super super dead now la.

IT IS SUPPOSED TO BE FUN AND GOSSIPY AND SCANDALOUS. watever la!
lol. now it is for reminders and for "transmitting information"

VERY SAD LEH

yeahh, ok, to start the ball rolling. I shall zi-high first den hopefully someone catches the zi-high bug and starts to blog. LOL.

ok yay, 1 more week before MODERN DANCE SYF!! OMG OMG, ppl who are free can come support clarice and myself and all the MAD-ERS this friday!! MAD modern dance showcasing our SYF item in the audi at 5pm and 5:45pm!! so if u are still in sch or you are interested to watch us, pls come down to the audi and give us ur fullest support! FREE ADMISSION AND FREE SEATING BTW. LOL.

and yah, everyone must come dance nite ok. tics going at $10 if i am not wrong!! and u can watch 10+ dances by chinese dance and MAD and some special guests that we have invited! so it is worthwhile! hahhaa.

RAR. so many tests coming and i studied nothing so far. super tired everyday though u guys can't really see any difference. (or maybe you can) bt anyway, hope that we can exceed expectations!! we can do it together as a class coz we are S78-ders! =))

AND YAH! CAN WE HAVE JTS first?! COZ I WAN STJ. lol. ok, pls dun dao me alright. i DEMAND a reply for this question.

AND WHOO HOO!

07s78 proudly presents to you our newly elected class prince & princess!!

SEAN POH SHI YANG
PHYLLIS YU SHI YUN.

*APPLAUSE*


hope i dun get killed for this!! OOPS!

ok it is almost 11pm now and we should all start to walk towards our bed..

BE GOOD EVERYONE! try to slp early.. HAHHAAA. AND I MEAN IT =)

if not, pimples will haunt you.

BYEE PPL.

from weiting.


Bouncing bouncing bouncing... off, POOF! ^.^

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Friday, April 13, 2007
「 bouncing away 11:48 PM 」

Hellooo, a few important bio-related reminders:
1. Please bring your bio tutorial file on monday for Mrs Tan to check
2. Do complete the bio practical given today by Monday
3. Try out your cytology and cell structure tutorial (or at least do some MCQ in case.

Okay, good luck everyone for monday's test! :]


Bouncing bouncing bouncing... off, POOF! ^.^

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Friday, April 6, 2007
「 bouncing away 9:40 PM 」

Mr Ho has set a date for a 78 food trip.

Details (tentative)
Date: 21st April 2007, Saturday
Where: Waraku Japanese Restaurant, at Cuppage
When: 6.30pm
Budget: Around $15 per person.

Food trip will only go through if there's at least 5 people who can make it. Those who can make it please comment/let Mr Ho know. Thanks.


Bouncing bouncing bouncing... off, POOF! ^.^

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Wednesday, April 4, 2007
「 bouncing away 9:33 PM 」

hi..pls take some time to read the text below. thnx

Shermy the Chemmy makes his debut appearance today! *clap clap clap*Hi I am Shermy the Chemmy, and i'm here to clarify your doubts and take you into the wondrous world of chem! *clap clap clap* Thankew thankew, so shall we go on? Today, we had our final (yay!) lecture on chem bonjing. As many of you raised eyebrows, scratched the head lice of your head, pulled your cheeks till you look like a bulldog in desperation at questions left unanswered during lecture, Shermy the Chemmy hereby presents you: Fun Stuff for Bonding! YAY!

Why do ionic compounds generally have higher MP than metals?
When an ionic compound is melted, enough electrostatic attractions have to be broken to allow small clumps of ions to slide past each other in a molten state. As electrostatic attractions generally require much energy to break, the MP of ionic compounds is usually high. In metals, the cations are held in a regular arrangement by virtue of electrostatic attractions between the mobile electrons and metals. When a metal melts however, electrostatic attractions are just weakened enough to allow the cations to gain enough kinetic energy to slide past one another, hence melting a metal needs relatively less energy and thus has lower MP than ionic compounds.

Why does silicon not form discrete molecules for silicon dioxide but carbon does in carbon dioxide?
Silicon is from the next period from carbon and oxygen, thus has one more quantum electron shell, which makes the atom larger. When carbon and oxygen react, the carbon forms a sigma bond with oxygen first. As the 2p orbitals of carbon and oxygen are around the same size and smaller than sulphur, the sigma bond is short enough to allow a side on overlap of another p orbital forming a pi bond. This allows formation of a discrete molecule. Silicon however, when it reacts with oxygen, it uses its 3p orbital. As the orbital is significantly larger than that of oxygen, the sigma bond is longer than that between carbon and oxygen. The bond length is too long to allow comfortable side on overlap of 3p and 2p orbitals. Moreoever, the different sizes of the 3p and 2p orbitals make formation of a pi bond more difficult. Thus Silicon prefers to form all sigma single bonds with oxygen in an extended structure. FYI carbon dioxide DOES form the giant covalent structure, called carbonia, but it is energetically unfavourable and forms back to normal gas form easily.

Then, why can sulphur form sulphur dioxide??
Sulphur forms 2 double bonds with 2 oxygen, but didn't we agree that 3p-2p overlap is difficult? It IS difficult but not impossible. For Si, it can easily hybridise 3s and 3p to form sp4 which makes it easy to form 4 sigma bonds of good overlap with oxygen. for sulphur, hybridisation is more complicated as it may need d orbitals, so using pi bonding is more favourable now.

So why does sulpur form 8-ring molecules but oxygen forms diatomic molecules?
When two period three atoms sigma bond, the bond length is longer than that for a period 3 and a period 2, meaning that an S-S bond is longer than an S-O bond. So after S-S bond is formed, side on overlap of 3p orbitals is even harder to achieve, so might as well save the trouble and use all sigma single bonds to maximise the overlap possible.

Then why is sulphur 8-ring? Why not 6-ring (like carbon is cyclohexane)?
Sulphur is large, so a 6-ring might pose serious space problems. 8-ring happens then, to be the first arrangement where the spacing of S atoms is far enough to not stress the bond and the bond angles. FYI sulphur does form S7 and S12! S7 is what makes sulphur yellow. So kewl.

But phosphorus is 4 member molecule! And it is a period 3 too!

This is actually white phosphorus, the least stable phosphorus. Because of the number of bonds phosphorus needs to form, this molecule can exist, but the angle strain due to the size of the atoms make this unstable and highly reactive. White phosphorus burns easily in air.Red phosphorus, the more stable matchstick form, is in a network arrangment, which means less strain on the bonds, and higher stability.

Why does carbon dioxide have higher melting point than chlorine gas?
I'm not sure about this. My guess is that carbon dioxide, although held by WEAK LONDON DISPERSION FORCES (not pd-pd. pd-pd needs a polar molecule. my old teacher taught me wrongly )= ), may be more polarisable than chlorine molecule since it is in a longer shape than chlorine, and maybe due to it's polar bonds too. MP(actually Sublimation point) of dry ice is -78*C chlorine is -101.5*C


Bouncing bouncing bouncing... off, POOF! ^.^

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