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Reliability + for performing multiple analysis - for not discarding the 0.64 result Validity + AAS a suitable technique - only using one sample of soil I don't know how correct that is though.

It shows you how big the syllabus is, there is just way too much to cover in one exam. Me too.

"Assess the suitability of the three sites for locating industrial plants to produce each compound". "Assess: Make a judgment of value, quality, outcomes, results or size" Obviously you don't just talk about B & C and forget A, you need to assess the suitability of all three. But if you...

I put the Solvay plant at C (limestone, rail access to port, close to ocean for dumping of water and CaCl2, pumping of brine), and the electrolysis plant at B (away from city where Cl2 kills people, access to electricity, on rail line to port anyway).

It detects smaller hydrocarbons more quickly. It detects pentanol first, then hexanol.

I put (a) as well, figuring that whichever one is on the anode is oxidising easily.

The 7 mark question featured a map, with features such as a large city, railway lines, the ocean, ports, limestone deposits, a river, and a power station. There were 3 potential sites for factories, the question was to find the best place to put a Solvay process factory (ie making sodium...

I'm pretty sure the HCl had a pH of 3. - I don't think so, the syllabus specifies "medicine" and "industry" as two different things, but that doesn't mean you'll get no marks. - It's not that surprising that there were no questions about the Haber process, it was there last year for 7...

The specific heat value for water published on the data sheet includes a "per kg" in it, so that shouldn't be too hard to remember.

Always use L, I think.

Acetic acid = ethanoic acid, they're the same thing. So it would just be that the vinegar is not 100% acid, it's probably dilute.

-Calculate the amount of moles of ammonia in 14g. Using moles = mass / molar mass, there are (14/17.034) = 0.8219 moles -The ratio of CO2 to NH3 is 1:1, so there 0.8219 moles of CO2 are needed. -Since each mole of CO2 weighs 44.01g, 0.8219 moles weighs 36.17g -If it asked for volume...

I think you're right, can you explain your one a bit further?

I think validity also takes into account the suitability of your method. For example, in the molar heat of combustion experiment (using spirit burners), a lot of heat is lost to the surrounding environment. This means that the calculated value of the alkanol's molar heat of combustion is...

I know there is already a thread on a similar topic to this, but I am a little confused about the concept of modelling reactions. Q29(e) of the 2004 CSSA Trial reads, "Modelling is used in chemistry to represent chemical reactions and explain concepts. Discuss the features of a model you...

You should have some sort of booklet which tells you what various uni courses require. Generally, ext 1 maths and physics are more important than chemistry for science and engineering. Most other faculties shouldn't require chemistry. I doubt any faculty *requires* ext 1 eng but that doesn't...

A - 42 B - 45 C - 33 I spend too long trying to make Module B work properly, so I had to rush C but got it done in the end I hope.

You never get those marks.

I thought it only asked for "a piece of imaginative writing". I did a narrative anyway though.

Landscape, a narrative about an "explorer" who is lost in the desert, but he turns out to be just a kid at the beach.