Chemistry SPA: Titration

Things to take note:
1. 3 significant figures
2. Units for calculation
3. Write in pen, but draw in pencil
4. Record in a table
5. Graph:
- axes
- points
- best fit line/curve

Types of graph:
1. Thermometric graph
2. pH curve

Sources of error:

Thermometric graph
1. contamination
2. heat lost to surroundings

pH Graph
1. Indicators do not change colour sharply at a particular pH. Instead, they may change over a narrow range of pH. Hence, the pH value may be lower or higher than the exact pH
2. Too much indicator solution is added. This may affect the concentration of the titrant. Acid-base indicators are weakly acidic or basic substances

Physics SPA: Light

Sources of error:

1. Pinholes are too big. Thus, angles may vary as many lines can be used

2. Outline of the glass block may not be accurate

3. There would be a range where our eyes would see all the pins being aligned. Thus, it won’t be accurate.

4. There is a range of where ‘u’ or ‘v’ such that the image seems to be clear(lens)

Precautions:

1. Silver surface of mirror should be placed on the line, instead of the glass

2. Fit the glass block into the outline drawn

3. Make sure that the centre of the lens is aligned to the light source(lens)

Things to take note:

1. Pins must be more than 5cm apart

2. At least 6 sets of readings

3. Range > 40 °

Special case:

1. ‘sini’ and ‘sinr’ can be left in 3 significant figures, don’t need to follow the rules

Also, someone please upload the "Graphmatical" software to our Class Yahoo Group.

P.S:You guys made the 100th and 101th post but I made the majority of the first 100.
IN YOUR FACE

Jordan.


heyhey!
im think that we should hve a bbq b4 the china scholars head back home.
like maybe in sme condo near school?
*hint hint
yeah. then at least they wont be so sad cos they will miss the chalet.
i think aft bio enrichment best. 8nov. sat
what do you all think?

*btw: im made the 101th post! ((:

HELLO GUYS!
i've just made some funny cookies class tee design out of boredom,
yeah i know it's non-relevant, but ahiya whatever lah.
oh and people please contribute to the class tee designs? if not we'll not get a design next year. ):

PLEASE PLEASE PLEASE . if not the cookie will beat you up.




the pink pink one which i saw that picture on google. ._.
originally from : HERE


the fake cookie i made. o.o

designs are for fun,
so yeah,
submit your class tee design leh! ( so commercial-like)

Wahlim

Changes to the Supplementary Lessons in the next 2 weeks:

28 Oct, 12pm: Chem (Not EM)
30 Oct, 8am: Chem (Not AM)
31 Oct, 1 pm: Bio (Not Chem)
10:30 to 11:30am: Chem (Not Bio)
6 Nov, 11:30am: Am (Not Chem)
7 Nov, 11:30am: Em (Not Chem)


Cindy

Yo Class.

Remember to do the teaching and learning survey! :(

http://www.zhonghuasec.moe.edu.sg/TLS2008/default.aspx

Jordan.

ok...

I GOT BETTER IDEA...

100 YEARS LATER WE MEET SAME TIME SAME PLACE. SEE WHO STILL ALIVE?!

the future...
im am proposing that we have a class gathering in the future.
yeah!
okay. details. [if you ever take it seriously like i do...]

Date: 10years from now, which is

20october 2018.

Time: 12pm

Place: SIX RESTAURANT AND BAR

[the one that we have walked past today, near the bird sculpture. yeah. if itis not there
anymore then we meet at bird sculpture or somewhere on tt particular street!]

COOL enough?
so please remember the special date! (:

*hey! must really take it seriously. we're see who will remember the class gathering.
i bet i will not change my hp no. so...
see everyone 10years down the street of the singapore river!

then we're like gather with different uniforms and outfit with different career background.
hmm.
remember this guys!

HEY HEY this is jingloon over here.
school is ending soon and we should do something fun/stupid as a class.

maybe like,
take out handphone outside general office at last/second last day of school?

get mass detention or something?

like we should do something that no 3e1 class has done before.

oh oh we could also buy wahlim's shades then everyone wear and walk out of school.

:D




CHEM REP HERE...

Mr Lim wants to meet us after school at 1.50 to give us the exam paper....

YEA.... SSP!!!!

NOT I SAY ONE...

ok...

CHEM REP SIGNING OUT..

Labels: chemistry

#2 CLASS CHALET

ALOHA LOYANG

11 NOVEMBER-13 NOVEMBER

*please make yourself free! :)

heyheyhey everybody!
you all must have been hving loads of fun in this mini holiday
BUT
please while enjoying ur mini holiday, think of some design for the class tee!
anything will do, like so ideas or some drawing. (:
lets all think of something nice for the class tee and make it
EXTRAORDINARY!
xD

[if you hve any idea can tell any of the monitors! ]

Cheers,
Liwen.

HEY everyone. zhen wei here.

mr lim wants us to hand up the chem workbook on tuesday

Yea...

THANKS!!!

this may seem interesting for some of u guys ~_~ lol

http://yzone.omy.sg/index.php?option=com_content&task=view&id=621&Itemid=75



http://yzone.omy.sg/index.php?articleID=8327&option=com_article&task=detail&cid=145&type=



lol i gave u all picture for the aid of those who are physically in aid of chinese. enjoy??

bb
~bored JC

I created something last minute for you guys. Hope it helps. ( Click to enlarge)


New Notes for Bio created by Yan Wei Ting
Bio Part 1
Bio Part 2

As Jing Loon requested. Here are the topics tested for the upcoming 4 papers.

Physics:
Measurement, Physical Quantities and Units
Kinematics
Dynamics
Kinetic Model of Matter
Transfer of Thermal Energy
Light
Temperature
Thermal Properties of Matter

E maths: Every Single Freaking Chapter from Both text books

Biology:
First 6 Chapters
Transport in Humans
Respiration
Excretion
Homeostasis


Exams put the F-U in FUN

Jordan.

I created some Geog notes. Hope it helps.
It list down the methods of management and its disadvantages in an essay format. Sorry but I did not do Natural Vegetation.

Rivers
Coast

Happy Mugging

Jordan.

Here are some Geog Notes made by Yan Wei Ting

Download:
Natural Veg
Rivers
Coast



Enjoy studying.

Jordan.

Any one of you have the coupons for "Fuji Ice Palace" or smth like that for ice skating? If you have it, please pass to me ASAP for the mini-outing.

Jordan.