2cm3

1. 2cm3 of solution is about 1.5cm3 in height in a test tube.
2. A rough estimate of the volume is good enough.
3. Use your little finger to estimate.
4. Do NOT waste time measuring exactly 2cm3 of solutions.


(courtesy of Ms Bernice Chen)

Test for Gases

1) HYDROGEN GAS - colourless and odourless



Test for gas: hold a lighted splint over the mouth of the test tube.
Observation: Lighted splint extinguished with a 'pop' sound.

2) OXYGEN GAS - colourless and odourless




Test for gas: Place a glowing splint into the mouth of the test-tube.
Observation: Glowing splint is rekindled.

3) CARBON DIOXIDE GAS - colourless and odourless

refer to 'test for carbonate ion' video

Test for gas: Pass the gas into calcium hydroxide(limewater) solution.
Observation: White ppt formed in limewater.
(Limewater turned chalky/milky is NOT accepted.)

4) CHLORINE GAS - yellowish green and choking


Test for gas: Hold a damp blue litmus paper over the mouth of the test-tube.
Observation: Blue litmus paper turns red and then bleached.

5) AMMONIA GAS - colourless and pungent


Test for gas: Hold a damp red litmus paper over the mouth of the test-tube.
Observation: Red litmus paper turns blue.

6) SULFUR DIOXIDE GAS - colourless and choking


Test for gas: Bubble the gas evolved into the potassium dichromate (VI) solution
Observation: Potassium dichromate(VI) solution turns from orange to green.

Do not miss me when I am away!

Please listen to the relief teachers and do the work assigned to you.

Here are some links of videos I have shown you.


http://www.privatehand.com/flash/elements.html

http://www.youtube.com/watch?v=Ft4E1eCUItI&feature=related&feature=related

http://www.youtube.com/watch?v=EqPxOq9NeCE&feature=related

O Assignment P Assignment!

Hello 4E2 and 4E3!!

I only have the following people who have handed in their projects.

4E2

Claire, Lydia, Cleo, Cindy
Krizha, Florance
Weiting, Kaylynn, Buena, Yolande
En Wei, Ming Quan, Melvin
Nathaniel, Jinzi, Jeremy

4E3

Sasha, Dinar
Kimiko, Sheryl, Jocelyn
Dinesh, Idris, Theenesh
Naveen, Eugene, Tian Quan
Valentina, Yan Qun, Felicia
Kai Quan, Vasu, Nicholas
Matin, Kah Seng, Zhiyan

Holiday assignment
ONLY Jocelyn Lee and Fanny have given me.

Deadline is this Fri, 14 Jan 2011 1230 pm

Any late submission = zero.

thanks

NEW YEAR NEW MOTIVATION NEW OUTLOOK

hello guys!

Are we ready for the short, busy yet challenging year ahead??

Happy new year anyway!

Holiday Assignments!

Okay. We are finally done with bridging. Ending it with super sore throat and some students were still very unappreciative despite me having such sore throat. ok nvm.

Anyway,

For those who were not here for last lesson, you can download the individual assignment from bps.net. (under science --> holiday assignment dec 2010)

The group project groups are as follows:

4E2

1) Claire, Cindy, Cleo, Lydia
2) Melvin, Ming Quan, En Wei
3) Valerie, Jocelyn, Jun Hui, Nathalie
4) Yolande, Kaylynn, Buena, Weiting
5) Emma, Meiyi, Lay Ching
6) Zubaidah, Josephine, Khairi
7) Jonas, Wenhao, Andrew
8) Jinzi, Jeremy, Anthony
9) Jaafar, Darryle
10) Florance, Krizha
11) Pyi

No group:
Zhi Zhang, Joel

4E3

1) Nicholas, Vasu, Kai Quan
2) Yvonne, Jai, Charlotte
3) Liqian, Amanda, Shanette
4) Valentina, Yan Qun, Felicia
5) Dinesh, Idris
6) Matin, Zhi Yan, Kah Seng
7) Tian Quan, Eugene, Naveen
8) Sheryl, Jocelyn, Kimiko
9) Dinar, Sasha
10) Mary, Fanny

No Group:
Theenesh, Chuan Zhen, Mingshu, Ranee

Those without groups, please go and find a group and update me.

ALL ASSIGNMENTS due 1st week of TERM 1 2011!

INTERESTING SIMULATIONS~

on limiting reactant

http://phet.colorado.edu/en/simulation/reactants-products-and-leftovers

salt and solubility

http://phet.colorado.edu/en/simulation/soluble-salts

strength of acids

http://phet.colorado.edu/en/simulation/acid-base-solutions

atomic structure

http://phet.colorado.edu/en/simulation/build-an-atom

play around with it to test your understanding.

HAVE FUN!