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Msj Chem

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Msj Chem last won the day on June 8

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    May 2016
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    Japan

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  1. Both STP and STAP are given in the data booklet. It should be stated in the question whether to use STP or SATP. STP is 273 K and 100 kPa and SATP is 298 K and 100 kPa. When doing calculations using gases, you should use STP unless otherwise stated. 1 atm is 101325 Pa or 101.325 kPa - this was used by the IB in the previous syllabus which gave a value for the molar volume of a gas of 22.4 dm3. The new syllabus uses 100 kPa which gives a molar volume of 22.7 dm3.
  2. If you took repeat trials in your lab, then you should average the change in mass between the pure Mg and the compound MgO.
  3. Maybe this will help:
  4. Ka is the acid dissociation constant and Q is the reaction quotient. Do you mean Kc and Q? Is so, maybe this video will help:
  5. Maybe this video will help: https://youtu.be/FbD5TTKGI-w
  6. http://www.msjchem.com/sl-option-c.html
  7. You are free to answer whichever option you want in the exam. My advice would be to answer the option that you have studied before of course.
  8. At SL, you only need to know that halogenoalkanes undergo SN reactions to form alcohols. The mechanisms and kinetics (unimolecular and bimolecular) are not required at SL.
  9. 28. The aluminum ion has a high charge density and is able to hydrolyse water molecules to produce H+ ions in solution and a decrease in pH. 29. A buffer solution should have equal amounts of a weak acid and the salt of the weak acid and strong base. Whichever choice gives you that is the correct answer.
  10. I have worksheets for this topic on my website. Maybe they will be helpful. http://www.msjchem.com/topic-13-periodicity-hl.html
  11. From May 2016 subject report (Copyright IB). Component grade boundaries Grade: 1 2 3 4 5 6 7 Mark range: 0 - 3 4 - 6 7 - 10 11 - 13 14 - 16 17 - 19 20 - 24
  12. You can find two videos on pH curves on my website here: http://www.msjchem.com/topic-18-acids-and-bases-hl.html Syllabus details can be found here, (see 18.3 pH curves). http://www.msjchem.com/uploads/1/1/1/1/11113745/topic_18.pdf
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