Wed-wednesday!

Heh, HEH.
*snicker*

In the morning my face was like - -.
In the AVA my face was like - o.
In 5B my face was like O_O.
After that, I was like ^_^.
At home, ate sour plums and it morphed my face into > <.

Joke. Finished some so-called-o-lvl meths and got 81/100
in 1 Hour. Well, that wasn't actually called 'aceing' in
meths, but damn, have I been doing too much prelims?
Nay, lets not get complacent.

Tmr is the pract. Not really nervous. But actually quite excited and
fascinated with how time flies.
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In any case, thanks for the wonderful after-sch chat. Made my day.
And you uh, MUST STUDY YA HEAR ME?!
Seeu2mr.
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Guys reading this, ensure that you have all your needed equipment before
going to the O-war. Harness all your knowledge and brawn and ace this
pract once and for all!
Chem :
MAKE SURE YOU KNOW YOUR SALTS.

Soluble Salts : All nitrates. All potassium salts, all ammonium salts.
All Chlorides except Lead(II) and Silver
All sulphates except for Lead Calcium and Barium
Insoluble Salts : All carbonates insoluble except Sodium, potassium and ammonium.

KNOW YOUR SALT PREPARATIONS:
1. Insoluble Salts
2. Soluble Salts
3. Titration

1. Insoluble Salts are formed when 2 Soluble salts are mixed together.
(Precipitation method)
i. Mix the Sodium Chloride and Zinc sulphate.
NaCl ZnSO4
ii. Filter the mixture and collect the residue(precipitate).
iii. Dry the residue on a filter paper.

2. Soluble Salts are formed when 2 Insoluble salts are mixed together.(VERY COMMON)
i. Mix Barium Sulphate and Lead(II)Chloride until no more can be dissolved.(Stir)
BaSO4 PbCl2
ii.Filter the mixture and collect the RESIDUE.
iii. Heat the residue until saturated.
iv. Leave it overnight to crystalize and dry by pressing between 2 filter paper.
(IV is not required. But I prefer to put it down.)

3.Titration is used when there is a Acid + Alkali.
For example, Sodium Hydroxide and Sulphuric acid.
i. Determine accurate volumes of alkali NaOH and
H2SO4 by titration.
ii. Obtain new samples of NaOH and H2SO4 that you have determined
from titration.
iii. Mix the new samples
iv. Crystalize or evaporate until dry, the salt solution is formed.
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Phy,
Note :
For electricity,
MUST KNOW:
Ohms Law : It states that for V to be directly proportional to I the tempertature
must remain constant.

Do not overheat your circuit or it may lead to it disobeying the Ohms Law.
Place your line of sight perpendicular to your measuring ruler. etc.
Check for zero error in your apparatus.

REMEMBER YOUR DECIMAL PLACES.

GOOD LUCK PEOPLE!