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yeh most likely.. I ALWAYS get them mixed up lol

I'm actually thinking of talking about an Analytical Chemist employed by the Sydney Catchment Authority, who performs analytical testing on water samples throughout the catchment area on a daily (or maybe weekly?) basis, testing for levels of heavy metals such as Pb2+,Fe2+ and others. Now...

I agree 100% JasonNg1025 is VERY gifted and talented. Good on him :)

Yeah, definitely. I reckon its nifty to do that.. it shows your marker you can link concepts from different parts of the module (I suppose).

Ohhh I seeeee lol ;)

Of course you can ;) The example I usually use is an organic or industrial chemist employed in the plastic industry. This chemist carries out quality control testing on plastics produced, such as LDPE and HDPE, by measuring density of certain plastics to examine the level/extent of branching...

lol depends at which way u look at it.. the main and correct thing is, which we all agree on.. is that when the bottle is opened, equilibrium shifts so that more gas is produced/released etc.

Yeah, I thought the same. For example, high gas pressures and higher temperatures produces HDPE ? (not 100% sure on this, have to read over notes again later on). And they use different transition metal catalysts to produce HDPE, and LDPE. Although all of the addition polymerisation begins...

this forum. big time. lol

kk cool thanx for the tip ;) i've never heard of that one before

Well, I'd imagine shaking the bottle would cause greater rate of collisions between CO2(aq) particles, as well as other particles involved in the equilibrium. By you shaking it, you're providing kinetic energy which also provides activation energy for the reaction to occur. As a result of...

I'm thinking maybe a precipitation reaction with Mg(NO3)2. Since Mg3(PO4)2 is an insoluble precipitate. Procedure would be: -Obtain a 100mL water sample (made up of mixed smaller samples from different areas of the water supply). - Add excess HCl to ensure that any carbonate ions are...

I'm still perplexed as to why people are still thinking you need to have a NAMED practising scientist. The exact syllabus dot points are: - Outline the role of a chemist employed in a named industry or enterprise, identifying the branch of chemistry undertaken by the chemist and explaining a...

Just remember that ppm is the same as mg/L or mg/kg. So, for example if your given concentration as 0.15g/L Then that would be 150mg/L --> 150ppm But more likely you will have to convert mol/L to ppm. to convert mol/L to g/L you MULTIPLY by the MOLAR MASS of the substance being measured...

I think know ONE in detail, such as Darmstadtium; how it is produced, when and where it was discovered.

[Sulfur] = 50mg/kg (since nov 2007 level corresponds to 55pm in jan 06 level) When 60kg of diesel is combusted, 50mg * 60 = 3g of Sulfur is oxidised. S + O2 ---> SO2 mole ratio is 1:1:1 therefore, moles of SO2 = 3g/32.07 = 0.093545 mol n = V / VM V(SO2) = 24.79 * 0.093545mol...

The textbook comes with a resource CD, which contains a FULL, pdf version of the textbook. The textbook (along with the resource CD) to buy is $59.95, and is a good buy, IMO. It goes strictly by each dot point, and provides content at a standard above the syllabus requirements. All the...

yeah, pretty much.

yep, those are all correct. alot of people wouldn't know about that last equation though, since most of the time u see NaHCO3 reacting with acids.