Define entropy, and give an example of a process in which the entropy of a system increases.

Video transcript

Hello everyone in this video. We'll find the correct statement that defines entropy and has the right example of a process with a positive change in entropy. So let's go ahead and recall. The entropy is let's actually write this out as well. So entropy, this is the degree of chaos or disorder, poor randomness of a system and it depends on the following. So the first thing it depends on is going to be the phase scroll down a little bit for more space. Right? So for phase, the gas phase has the highest entropy followed by the liquid and then the solid phase with the lowest entropy. So it's going to be gas then liquid then solid. Because I guess in the gas phase the molecules are definitely more free floating and they're bumping around everywhere against each other and against the walls of the container. Second thing that depends on is going to be the complexity. So more elements in the compound leads to higher entropy. So for example We have n. This has four elements. So we have three items of oxygen and one item of nitrogen. It has higher entropy. Then let's say n. 0 2. This has three elements. So we have two atoms of auction and one atom of nitrogen. 3rd thing this depends on is going to be mass. So the greater than mass, the greater the entropy. So for example Xenon and its cash a state has a greater mass or higher and of course our higher entropy than helium gas. Alright, so taking a look at this problem here. Exactly scrolling up. So we said again that entropy is a degree of chaos disorder and randomness of a system that it depends on phase complexity and mass. Taking out the first kind of definition, Never entropy looking at A, B, C and D. The one that best fits in so far is going to be well, all of them almost or not all of them just A and B. Because she's saying that it's a total energy change of the system, so it's going to be between A and B. And then we have different processes to that they compare with. So the for the first one statement is going from liquid to gas, we're thinking we have a positive change in entropy and then for B we have the gas going to liquid. So we said that gas has the highest level of entropy and that's all it is the least. So then if we're going from liquid to gas this will definitely have a positive change in entropy. But going from gas to liquid crime, going backwards in our kind of ranking here. Mean that my correct statement is going to be statement A where entropy is the degree of randomness of a system and the following process has a polish change in entropy where we're going from a liquid to a gas at room temperature. So this is going to be my final answer for this problem