## Lecture

$\Delta U=q+w$

sharonvivianv
Posts: 63
Joined: Fri Apr 06, 2018 11:05 am

### Lecture

Can someone summarize the explanation of the heating curve. I didn't exactly follow everything that was said.

Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Re: Lecture

I believe you are asking about the heating curve for water that was presented in class. It illustrates that during a phase transition, there will be heat going into the reaction but there'll be no change in the temperature of the sample because all of that work is being used for the phase change.

marisaimbroane1J
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

### Re: Lecture

The heating curve also showed that there is much more energy required to convert water from a liquid to vapor than from a solid to liquid; this was used to explain why someone with a burn from 100 degree water vapor would have a more serious injury than someone burned with 100 degree water.

Melissa Bu 1B
Posts: 36
Joined: Fri Sep 28, 2018 12:19 am

### Re: Lecture

Moreover, the heating curve showed that water vapor burns more than liquid water even though they are at the same temperature (100˚C, shown on Y axis), because water vapor has more heat than liquid water (shown by the fact that it is further right on the X axis, which represents heat).

Ashley Kim
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am
Been upvoted: 1 time

### Re: Lecture

Ultimately, the heating curve for water shows how the phases (solid, liquid, gas) of water change over time as the water is consistently heated. It also relates with the enthalpy of fusion and the enthalpy of vaporization because the heat accumulates, resulting in these phase changes.

Eva Guillory 2E
Posts: 44
Joined: Fri Sep 28, 2018 12:22 am