Search results

Hmm...Not really the case. I came 2nd in chem in prelim. I think I'm now either 1st or 2nd. Bio I was 3X or so, and after half yearlies HSC I got rank 5. I'm certain it dropped though. I THINK that it should be changed to... "Every1 who came top 5 in beginning of HSC year is not coming top 5...

lol I really hope that was sarcasm.

Re: chem again!!!!! =O Wow dude, you're in year 11! How do you know all these stuff xD You're doing Chemistry Olympiad?

Re: chem prac You sure got a lot of questions xD http://www.boredofstudies.org/view.php?course=11 Search for "11" or "prelim", you'll find them.

Re: chem again!!!!! It's actually a semi-metal. I'm not sure HOW, but yes, Boron does form weird bondings.

Re: chem again!!!!! Probably has properties of both. Like the quantum theory. Is light wave or particle? :lol:

Re: chem again!!!!! It's not really covalent. If you're interested, search for beryllium fluoride on wikipedia.

lol well I haven't even read your answers, but for 6 marks you gotta be writing a lot more. Here's a general rule for high mark questions: 1 mark = ~1.5-1.8 min worth of writing But of course, it doesn't meant just babble on without relating your answer to the question. The amount of marks...

Re: chem help guys!!!!!!! :uhhuh::uhhuh::uhhuh:

Re: chem again!!!!! It's a special case. Don't worry about it.

Hahaha. I forgot everything in year 11 biology.

Re: chem help guys!!!!!!! No, you don't multiply the molar mass of silver by 2. You've already got the number of moles of Ag ions. All you need to do is multiply it by Ag's molar mass.

Re: chem help guys!!!!!!! Yes, I'm pretty certain my answer is correct. The flaw of your actual calculation is the molar mass bit. I have no idea how you got 310. The molar mass of Ag is clearly 107.9, or 108. You probably used the molar mass of silver sulphate. But we're not interested in...

Re: chem help guys!!!!!!! 1. When doing any questions, make sure you know from the start what you're meant to do. In this question, the question asked for the mass of silver ions in the beaker. There are 2 flaws with that equation. Firstly, it is not balanced correctly. The coefficient of Ag+...

Re: chem help guys!!!!!!! Moles = Concentration x Volume Moles of Ag2SO4 = 0.1 L x 1.0 x 10-5 mol/L = 10-6 mol 1 mole of Ag2SO4 = 2 mol Ag+, 1 mol SO42- Therefore 10-6 mol Ag2SO4 = 2x10-6 mol Ag+ Mass= Mole x Molar Mass Mass of Ag+ = 2x10-6 mol x 107.9 g/mol = 215.8 x10-6g = 2.16 x10-8 g

Do all the homework the teacher sets. It's good background knowledge.

Who set the solutions?

I got 0.7 mg as well.

Girls have the advantage here. They can write it on their legs under their skirts, and lift it up to see. It will be awkward for supervisors to request that the girl undresses.

Chinese history (Yes, history. Not mythology.) states that there were 300 teenage boys/girls sent from the Emperor of the time to search for a medicine that gave immortality, when the Emperor fell seriously ill. The group travelled their way to Japan, and decided to settle there. Then from...