In question 9 has anyone managed to understand the last part of the question. First of all they gave you temperature and k graph you then had to state what k and A stands in Aarrhenius equation, then they asked you to calculate activation energy and the last to marks were for finding A - how do you find A I was so confused, so I somehow cramed some numbers in my calculator and a random value appeared it looked fine so I wrote it in.
Overall the paper was mediocre, though it could have been much worse. Question 1 was pretty good however I could't figure out how to write redox equations for oxidation of hydrogen peroxide. Question 2 was also not bad as they asked to find a limiting reactant, I got .003 moles for magnesium and .03 moles for hydrochloric acid - you sneaky IB trying to confuse people. And then they asked why experimental value of hydrogen is lower than theoretical - I hate the application questions as IB tends to come up with very specific reasons. Question 3 was lattice enthalpies and it was OK, I especially enjoyed the diagram. Question 4 Lewis structures for XeF4 and the nitrate ion NO3- - thank you IB for this question !!!!!!!. Question 5 was about isotopes, I couldn't think anything about carbon 14 so I sort of waffled on about.......something. And of course question 6 - salt hydrolysis...I couldn't remember any equations so I just explained it. Part B was equally OK.
Though paper 1 was strangely easy - made me worried last night.