I liked these papers generally. Only questions I didn't get were:
- the titration calculation for C3.
- the final question on the Haber process in C3. Guessed it was by fractional distillation even though that's alkanes from C1.
- the question about why silver is in water filters, again guessed because it kills microbes.
I think the two methods of water treatment for the first question were filtration to remove any solid particles, and treatment with chlorine to kill any microbes that may be in the water.
Hey, when are the official boundaries released?
what did you guys get for the titration calculation in C3? I got 0.17 and this makes sense because:
The other substance had a volume of 25cm3 with a conc. of 0.2mol/dm3. The concentration of the substance looked for must have been less as this substance had a higher volume (26.8cm3)?
hey, you know on c2, what did people put for a) silica question about lower melting point,
b)how nanotubes are used as lubricants?
c)the question about conclusion of nanometeres on ph graph?
yeah, okay, i just wrote down a many legitimate sounding reasons i could think of for nanotubes, and I messed up the paper chromotography somehow, i didnt think; i thought the two dots that were at the bottom were the starting ones so i said a) fruit juice had one, cola had two b) cola had more, reckon ill pick up any marks at all for that? It was abstract one and two markers like the three mentioned , that made it so much harder than c3 for me