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November 01, 2025, 01:16:53 pm
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Author Topic: Q14 and Q10 MC from 2008 exam.  (Read 560 times)  Share 

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LSC

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Q14 and Q10 MC from 2008 exam.
« on: November 11, 2009, 07:59:18 pm »
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arthurk

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Re: Q14 and Q10 MC from 2008 exam.
« Reply #1 on: November 11, 2009, 08:04:05 pm »
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10. Matter can not be created nor destroyed, thus as it is a closed system mass will remain the same
14. The specific heat capacity of water is 4.18 but some energy is required to heat the calorimiter itself
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TheJosh

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Re: Q14 and Q10 MC from 2008 exam.
« Reply #2 on: November 11, 2009, 08:12:50 pm »
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elaboration of 14.

Calibration factor = energy/Change in temp

energy= specific heat capacity water (4.18) x change in temp x mass of water

since 1mL water= 1g we can say water is 100g

if you sub energy for water into calibration factor formula you get

S.H.C x mass water x change temp/ change in temp
you see that the change in temps cancel out so C. F is just S.H.C x mass of water which is 418JC-1

as arthurk said, some energy is used to heat calorimeter it self and so a higher calibration factor would be obtained therefore answer is C
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