Chem review

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highlighter
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Joined: Sat May 25, 2019 9:32 pm

Chem review

Post by highlighter » Fri Jun 28, 2019 1:22 pm

Hi, I am reviewing an example on page 99 of the chem book & in step 1, the calculation has a positive temperature. Is this correct? Or is there a specific reason why it's positive and not negative?
NS_Tutor_Will
Posts: 766
Joined: Fri May 25, 2018 9:15 am

Re: Chem review

Post by NS_Tutor_Will » Fri Jun 28, 2019 2:08 pm

Thanks for the question!

Positive values are used for temperature here because the formula in question requires us to use ∆T instead of a value for T. In first part of the example, the water is increasing from -20°C to 0°C which is a ∆T of +20°C.

I hope this helps clarify it and good luck!
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