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mathwiz

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  • Exams
    May 2011
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    United States
  1. what volume of sulfur trioxide in cm3 can be prepared using 40cm3 sulfur dioxide and 20cm3 oxygen gas by the following reaction? Assume all volumes are measured at the same temp and pressure. 2SO2 (g) + O2--------> 2SO2 (g) a 20 b 40 c 60 d 80
  2. which species can act as a a lewis acid ? A. BF3 B. OH- C. H20 D. NH3 I Though the answer was h2o because it is amphoteric but the answer is A can someone explain this to me? also how do you find the IB discus ion subject reports on this?
  3. where did you find that subject report for that question say? or anyone?
  4. exactly what I answered..pretty easy the mark scheme said B...doesn't make sense since there are three 2.4 measurements which definitely would make it precise? I hope that is a misprint?
  5. I think that the markscheme answer is wrong so I am asking this past paper question on this forum Using an accurate pH meter, the pH of lemonade was found to be 2.30. Some students deduced the pH of the lemonade after titration with 0.10dm3 sodium hydroxide solution. Their determined values of pH were 2.4, 2.5,2.4 and 2.4. What is the best description of the precision and accuracy of these measurements? precision accuracy A precise inaccurate B not precise inaccurate C precise accurat
  6. Is any part of the group 4 project assessed by IB people or is everything (including reflection) marked internally within your school by your teachers?
  7. Does anyone know of any good IB chemistry experiment relating energy drinks to the human body? Respond ASAP!!! Thanks for the help!!
  8. Does anyone know of any good IB chemistry experiment relating energy drinks to the human body? Respond ASAP!!! Thanks for the help!!
  9. got 2 results math sl 7 chem sl 7 4 HLs for next year!!! really happy congrats to you all for doing well.
  10. does anyone know how many questions or type of % you need to get right for a 7 on the math SL exa- like on paper 1 & paper 2 how many can i afford to get wrong if i am aiming for a 7
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