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November 08, 2025, 04:03:02 am
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jackinthepatch

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Question
« on: May 03, 2009, 10:42:31 am »
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Hey guys I'm having a little problem with question 2 in the multiple choice section of the 2008 exam.

The link for the question is here:
http://www.vcaa.vic.edu.au/vce/studies/chemistry/exams/2008/2008chem1-web.pdf

When I calculate the number of mole of serotonin my calculator gives me 8.52 x 10-15 rather than 8.52 x 10-12, which the assessment report says you should get. Is my calculator faulty, or is there something wrong with the question? 

Any help would be appreciated :)
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Dark Horse

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Re: Question
« Reply #1 on: May 03, 2009, 11:12:38 am »
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The answer is A. The concentration is 1.5 nanogram per litre. They ask you for the amount in 1 ml. If you use this, the answer turns out to be A. :)
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jaja

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Re: Question
« Reply #2 on: May 03, 2009, 04:57:16 pm »
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A manufacturer of biscuits claims that the energy content of their biscuits is 21.6 kJ/g. A student wishes to test this claim. He completely burns 0.45 g of a biscuit in a bomb calorimeter. If the initial temperature is 18.6°C and the calorimeter constant is 1150 J/°C, what is the expected final temperature in the calorimeter?

This was in the checkpoints online quiz. Is it even a unit 3 question?
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shinny

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Re: Question
« Reply #3 on: May 03, 2009, 05:04:46 pm »
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Not for the new course, no. You'll be doing that stuff in unit 4, but it used to be in unit 3 before last year's course change.
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