Ethanedioic acid.



Molecular formula : C2H2O4 /C2H2O4 .2H2O (?)
MW : 90.04
CAS No. :144-62-7


Nature transparent colorless crystals or a white powder, odorless, The findings. 1.650g/cm3 density. 101 ° C melting point. The boiling point of 150 ° C (sublimation). Slightly soluble in water, soluble in water, alcohol, ether-soluble, non-soluble in benzene. In dry air heating or small crystal water will be lost. The organic acids are strong acid, alkali and the Sino-and role. With reductive. With sulfuric acid role lose moisture, the foundation decomposed into dioxide and carbon monoxide. And the role of oxidant easily oxidized into carbon dioxide and water. Toxic to the skin, mucous membrane and stimulate corrosion vulnerable by the epidermis, mucosal absorption cause poisoning. Air maximum allowable concentration of 1m g/m3.

My goodness.It's really suffocating and tedious for me since I have no background of whatsoever the "orbital" thing is about in the new topic,Atomic Structure.
First of all,i was lucky because i had my sister's notes(which was a miracle she didn't threw it yet),which aided a lot on my study for this topic.Secondly,i really don't understand anything when Mr Tan explained roughly on the topic to the class (So sorry!) It's my fault,haven't been reading up
So,apparently,chemistry's taking a hell lot of my sleeping time.haha.

Back to the main reason for this post,..

Protons(p) is positioned in nucleus,with +1electric charge,relative mass of 1.
Neutron(n) is positioned in the nucleus,with 0
electric charge,relative mass of 1.
Electron(e^-) is positioned around the nucleus,with -1 electric charge,relative mass of 1/1840.


Principal quantum numbers >No of energy lvl>e.g (n=1,n=2....)
Types of subshells: s,p,d,f. (Mr tan said we only need to learn up to s,p,d)
The sequence goes, 1s^2,2s^2,2p^6,3s^2,3p^6,3d^10
When drawn in boxes,(electron-in-boxes method).................each box can draw up to 2 electrons.
By which their spins is always opposite,starting from up arrows,followed by downward arrows
1s have the lowest energy,4f-the highest,however to take note,3d has higher energy than 4s

shapes of orbitals for s,-spherical
shapes of orbitals for p(px,pz,py)-Dumb-bell
Different aces of symmetry,mutually,perpendicular to one another,orbitals (px,py,pz) with the same p.q.n have the same energy,ie.they are degenerate

the laws/rules to follow:
1)Pauli Exclusion Principle
2)Aufbau (for building up) Principle
3)Hund's Rule

Ok,i typed this all out because i find the online notes gave quite a lot redundant information.(ops) haha.It's quite messy though,sorry Ms Jee/Mr Tan

As for Ionisation Energies,NEXT TIME PLEASE!

Question:How does the equivalence point of a titration differ from its end point?

Answer:
The equivalence point is the point where the number of moles of base equal the number of moles of acid. The end point is the point where the indicator being used changes color. If the indicator is chosen correctly, the end point will essentially be exactly at the equivalence point. The point of the titration is to find the equivalence point -- the end point is just a very close approximation to it. This is because the pH of the solution changes very rapidly close to the equivalence point. Therefore, the indicator will change colour very close to the equivalence point because of the steepness of the pH change.

I understood now,clearly!
C:
C:
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Ohhhh..I've just realised my dates and time's so screwed up.
And it's cool,because that meant that i woke up on 4.12a.m(previous post) just to post an entry.
Now now,how hardworking am i?HAHA

Well hello there!
This entry's gonna be on my choosen career,which was like for now,a journalist.
First of all,on lighter note,let me elaborate on why i wanted to be one.
The reasons is fairly simple.1)I like writing,a lot. 2)I like to have updates on the latest news. 3)I like anything related with english language! 4)Working alone sounded quite fun(i guess....) As quoted,"Traditionally, journalists have more or less worked alone."

Okok..
Now..Let's go into much formal stuffs...like what it is all about!

Journalists in both the news business and feature writers for magazines typically will develop their stories, dig up their leads, conduct their interviews and draft the final product themselves. In the newspaper business, major stories will sometimes become collaborative efforts where several reporters are working on aspects of a story and their work is edited into a single piece, published under multiple bylines.

Ok..Job requirements!(generally)

Responsibilities:
-Gather, edit, write & voice the daily news & sports bulletins
-Ensure that the quality of news & sports bulletins is of a high standard, accurate & credible
-Conduct roving reports & interviews for news
-Cover assignments & produce capsules for radio news
Entry Requirements:
-Diploma or Degree in Mass Communications, Journalism, Chinese Studies or Political Science
-Preferably 1 year of experience in journalism or related field
Attributes:
-Passionate in news writing with keen interests in current affairs & sports
-Writes well & able to work under pressure.
-Ability to read and write in English is an advantage
-Mature, independent & has initiative.

Ok..I know it's a bit far-fetched from what i'm studying now(SCIENCE STREAM) which was like a bit unrelated..But well,i can't get in mass communication in NgeeAnnPoly in the first place,not as if i don't want to ):
Sad huh?!But i believe,just believe that....Nothing's impossible!(yeah!good phrase to quote!thanks Nike! C:)----EDIT,BY ADIDAS,(thanks to Mr.Kensei.)

Weakness in chemistry:
Can't balance equations fast enough.
Takes quite some time in analysing questions.

Strength in chemistry:
I've no idea?The best result i've ever gotten in certain topics?
& my strength in chemistry is that i like chemistry.:D

Reflection:
I learnt the different tips and precautions to take note of.
And how to use experimental equipments safely and properly and rightly.