Wanderer41 wrote: » Thanks a million, I really appreciate it I think it says in the marking schemes that other answers are acceptable if they are correct, as in not all answers are listed. However I think for definitions especially you have to have the bold text.
rocco123 wrote: » Yeah I suppose, but say for a question on rates of reaction on one of recent years, making schemes more collisions are effective if I say more effective collisions will I get the marks?
Murky013 wrote: » For exp, it's either %water of crystallization, iron tablets or vinegar titration. For organic its either ethylene, ethanal or ethanoic acid one That's my gut feeling imho
little sis... wrote: » Ethylene?
marno21 wrote: » World Cup 2 - 0 Chemistry study What I meant abotu the biology is the biology paper was different to all the other years this year. None of the usual topics and strong emphasis on lesser stuff. Imagine a paper this year with no atomic theory as q5 etc. (sorry for scaring some of ye)
MacBizzle wrote: » Anyone else want the DEB paper?
WoolyAbyss wrote: » Do we need to know the diagrams for the organic experiments or do they always give them? The ethanal and ethanoic acid ones would be horrible to draw.
plmko wrote: » What's the timing for Chemistry? Twenty mins per question or..?
accountname wrote: » For the HCl and NaOH, just know the formula for it and the units you have to convert the figures to. If they ask it in Section B I'd only see them asking a calculation for it
plmko wrote: » Thanks! And how do you do the calculations?
accountname wrote: » Formula is; heat= m * c * (t2-t1) where m = mass in kg c= specific heat capacity of solution given in the question and t2-t1 is the difference in the temperatures Just sub in all them and you'll get your heat in kJ/mol 'Tis a dirty calculation but as you said, it came up last year so I wouldn't worry too much about it :P
MacBizzle wrote: » Are potassium iodate and potassium iodide the same thing?
Ompala wrote: » Nope, Potassium Iodate is KI03 while potassium iodide is KI. -ate is used in the naming of things that contain oxygen e.g iron sulfate FeSO4
MacBizzle wrote: » Think we must have skipped an experiment so, or else I just wasn't listening... :rolleyes:
Ompala wrote: » Off the top of my head, isn't potassium iodide used in the winkler method for determining dissolved oxygen?
JDOC1996 wrote: » Predictions ?
wafture wrote: » Hach test kit?
TooMuchStudy wrote: » What are the chances of a gas question coming up this year?
