I'm also form 5 this year , science stream student but without Bio , so hello pals.

Btw, im having problem on understanding Destructive interference and Constructive interference in physics - Wave. Could anyone help me on this?
EDIT: Nvm , i've found the answer for it.


Questions regarding to Chem will be posted later

May i add you on msn, jiaxun koko?

This post has been edited by Riggo: Jan 21 2009, 05:50 PM

Does anyone have any clue on analyzing ions?

Qualitative Analysis of ions

To identify the cation and anion present in a given substance.

You'll be given a substance and also colour of it [sometimes] in a common question.

I've no idea whether this kind of question would frequently pop up in SPM paper.

This post has been edited by Riggo: Jan 21 2009, 07:24 PM

I've also been revising salts for few days , its quite tough tho. Have to memorise all the insoluble and soluble salts ><. Besides, questions for the analysis of ions are truely long, you may try to find it in any reference book , but i'll try to quote it from google ;D.

EDIT: What is up with your MSN? you're not signed in.

EDIT2: Analysis of ions is included in salt chapter.

This post has been edited by Riggo: Jan 21 2009, 07:27 PM

chemistry Q:

Aluminium nitrate can be prepared by mixing

A) aluminium chloride with dilute nitric acid
B)aluminium oxide with dilute nitric acid
C)aluminium sulphate solution with sodium nitrate solution
D)aluminium carbonate with potassium nitrate solution

Post your correct answer with explaination please.

This post has been edited by Riggo: Jan 23 2009, 11:46 PM

Tq for your good explaination , dude. Im much clearer now

periodic table is always given in SPM