Consider the vaporization of liquid water to steam at a pressure of 1 atm. (a) Is this process endothermic or exothermic?

Video transcript

Hey everyone today, we're being asked if the solidification of water to ice at standard conditions is an endo thermic or exhaust thermic process. So what exactly does this mean? So an exact thermic process, as the name suggests, eggs, a thermic relies on the release of heat as the reaction progresses, release of heat as such. If heat is being released, this implies that we're reaching a more stable state of being. So if things are to become more stable, that means more bonds are being formed, bonds are formed and we'll end up with a negative delta H. In contrast to this and endo thermic reaction uh takes in heat, heat is absorbed into the system. For the reaction to proceed, heat is absorbed and as such, if heat is being absorbed well, this means that there is more energy that is coming into the reactant, which means it will actually end up breaking bonds. It will excite the bonds so much that bonds well, break as such, the change in entropy will also be positive. So let's go ahead and take a look at the solidification of water. Right, And this is pretty straightforward. We just have Htoo liquid. Each two. Oh, liquid becomes a church too. Oh, solid! So what's happening here? The liquid, which is free flowing and pretty much almost amorphous gas, if you will, has become rigid, more bonds of form, it forms an ice crystal structure. So heat is actually being released from the system in order to form more bonds specifically, hydrogen bonds between the water molecules in order for them to obtain this crystallized structure. So, since the phase has reached a more stable state of being, we can therefore assume that this is indeed an exotic thermic reaction. The solidification of water releases heat ceramic and his exo thermic in nature. I hope this helps, and I look forward to seeing you all in the next one.