How to Graph Temperature Changes in Chemistry

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Graphing temperature changes in chemistry will require you to create a phase change diagram. Find out about graphing temperature changes in chemistry with help from an experienced chemistry and science professional in this free video clip.

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Video Transcript

Hi, I'm Robin Higgins, and this is how to graph temperature changes in chemistry. So, chemistry temperature changes have a pretty standard way of operating, and they're represented here, and we call this is a phase change diagram. So, basically this is the process that all of our pure substances are gonna follow. So a really good example to think about is water, since we're familiar with all three phases. So first, we start over here and our two different axis are temperature and amount of heat added. So, at this point we've got a solid. We've just got an ice cube. He's hanging out, he's chilly, he's definitely a solid, and as we put heat into it, the temperature starts to rise, which make sense, right? We heat up an ice cube, pretty soon it heats all the way up until right here, when it will reach its melting point. So, the melting point is the point when it starts melting. So, now it's going to be a solid and a liquid. So it's a melting ice cube. And the interesting thing here is you can notice the temperature does not rise. This whole process where your ice cube is melting, the temperature's exactly the same, and that's because every bit of heat that's added is used as energy to break down the bonds in between the different ice water molecules to become liquid. So we don't have any extra energy to raise the temperature of the liquid, we only have enough energy to put into the ice cube to break those bonds down. So, the temperature stays all the way the same until we're all the way at just a puddle of water, and we have our liquid right here. And so now we have another temperature rise, right? Because now we're just heating up water. So this is like boiling water for tea or something. So you're just getting the liquid hotter and hotter and hotter. That makes sense, we have temperature rising until you reach this point. And this is the vaporization temperature. So for water, right? If you're boiling tea, it's going to be 100 degree Celsius. So, now you have, you're starting to make steam. And again, during this phase change process, you're not changing the temperature at all. It's completely flat because all the energy you're putting in to making that phase change happen and separating the water molecules until their vapor form, which means they're completely separate from each other. So, you put more energy in, all of your liquid turns to pure vapor, and then once you have a gas, you can continue to raise the temperature when you put more heat in. And gas is the last form, so pretty much you just raise the temperature and it just gets to be a hotter and hotter gas. So, this is the phase diagram if we are heating something up, of course we can do the exact opposite, right? If we could trap water vapor and cool it, we can make condensation, right? This is what happens if we have like an icy drink, and the water vapor in the air will come in and find that cool temperature and actually turn into beads of water, so condensation, and then you can cool it even more. Say you take that soda, or that cool drink, put it in the freezer, and then you will now freeze those beads of water, and you'll get back to your solid point. So it works perfectly either up or down. I'm Robin Higgins, and this has been how to graph temperature changes in chemistry.


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