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IB Test Answer Keys

Page history last edited by Brendt Bly 11 years, 3 months ago

Do NOT just memorize the answer key.  The answer key contains some notes to the examiner, and some of the symbols mean different things.  Read the following before checking answer keys:

  • A slash '/' means "or"
  • A semicolon (;) means that that sentence is worth one mark [1]
  • OWTTE means "Or words to that effect."  Do not write this on your exam.  It is a note to the teacher correcting your test, which means that if you explain your answer correctly, but use different words, you will still get the points.
  • "ecf" means "Error carried forward."  This is a good thing for you.   If you make a mistake earlier in a problem--for example, you calculate the molar mass incorrectly--and you use the same number or information to do another step in a problem, you will not lose points for it, unless it says differently in the mark scheme/answer key.
  • Significant figures.  You can only lose one point/mark for significant figures on paper 2 and paper 3.  If you make a mistake in significant figures in the short answer, you will lose one mark.  If you make another mistake with significant figures, you will not lose any points!
  • Show your work.  Sometimes you are only given marks/points for the final answer in calculations.  However, if you're wrong, you can usually get most marks/points for showing your calculations.
  • Units do not usually matter, but include them just in case. 

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