Delta T

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Shannon Asay 1C
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Joined: Fri Aug 09, 2019 12:16 am

Delta T

Postby Shannon Asay 1C » Tue Jan 28, 2020 1:30 pm

In calculating the enthalpy of a system, why is it that the delta T for an exothermic reaction is positive?

Kevin Xu 4F
Posts: 50
Joined: Fri Aug 09, 2019 12:16 am

Re: Delta T

Postby Kevin Xu 4F » Tue Jan 28, 2020 2:00 pm

The definition of an exothermic reaction is one that gives off heat. In the case that delta T is positive, that is looking at the change in temperature with respect to the surroundings, because sometimes there is no appropriate way to measure the delta T of the system. An exothermic reaction as a system will give off heat to the surroundings, thereby increasing the final temperature of the surroundings. When reading the setup of the problem, make sure to not whether the delta T is referring to the system or the surroundings.

Tyler Angtuaco 1G
Posts: 130
Joined: Wed Sep 11, 2019 12:16 am

Re: Delta T

Postby Tyler Angtuaco 1G » Wed Jan 29, 2020 4:38 pm

The final temperature of the system is less than the initial temperature of the system since the exothermic reaction caused the release of heat.

Andrew Liang 1I
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: Delta T

Postby Andrew Liang 1I » Wed Jan 29, 2020 4:43 pm

delta T is measuring the temperature outside of the system. While delta H is measuring in terms of the system inside. So in an exothermic reaction, delta H would be negative but delta T would be positive. And in an endothermic reaction, delta H would be positive, but delta T would be negative.

Ruth Glauber 1C
Posts: 100
Joined: Wed Sep 18, 2019 12:20 am

Re: Delta T

Postby Ruth Glauber 1C » Thu Jan 30, 2020 9:20 am

Because it gives off heat.

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