 All right in this video. I'm gonna go through the heating curve and explain everything that you need to be able to pull off of one for our thermochemistry test So this is a heating curve Typically you see temperature on the y-axis and degrees Celsius on the x-axis You can see a couple of different things this one has minutes So as we're progressing a long time is going by or this is similar to what we did in class when we made our heating curve But you may also see heat input or something like that down here where this is measured in Joules The shape will be the same no matter what the Particular graph is whatever they put down there. You'll still end up with this slope going up Not a plateau then a slope going up then a plateau and then if you can capture the gas You get another final slope going up here at the end Let's talk about what's going on in each of these segments and what you need to know about them first of all In this segment here We have a solid in The container and it would be nothing but a solid theoretically and that solid is warming up That solid gets warmer and warmer and warmer and warmer and warmer until it reaches this point at about 60 degrees a little bit less maybe 55 degrees somewhere in there where it begins to melt and as it melts Obviously, you would have solid and liquid in the container as we progress along the amount of solid would be decreasing the amount of liquid would be increasing until we reach this point Where it would be all liquid in the container and the temperature would start to rise again That liquid would get hotter and hotter and hotter and hotter until we reach this point Where it would begin to boil and as it boils you have liquid and gas as As you progress along less and less liquid more and more gas until it would be all gas and like I said If you can capture that gas you could continue heating it That gas would warm up until it became a plasma at some point Now there's a lot of other things that we need to know about this beyond what's going on statewide is where the melting Is where the boiling is we have to recognize when something melts it's absorbing heat of fusion And what the heat of fusion is going to do here is is weaken the intermolecular forces between the particles Allow those particles to fall out of their fixed positions that they have in the solid and begin to move around randomly like they do in liquid up here boiling It's absorbing heat of vaporization You know what this heat of vaporization is doing is removing the intermolecular forces liquids have them gases don't So as the substance boils the energy that's flowing into it has to be removing those intermolecular forces allowing those particles to move around independently There are changes in kinetic and potential energy that take place along the way We remember that change in temperature is A change in kinetic energy So as the solid warms up the kinetic energy is increasing the particles are vibrating faster and faster Happens when the liquid warms up as the liquid warms up the particles move faster and faster That's an increase in kinetic energy and what happened with the gas too So where the gas would be warming up that would be an increase in kinetic energy That's on the screen Good it is There's an increase in kinetic energy if they're too bottom line Anywhere the temperature is going up the kinetic energy is going up temperatures are relative measure the kinetic energy of particles that matter Low temperature means they move slow high temperature means they move fast So as our temperature is increasing the kinetic energy is increasing as the temperatures increasing the kinetic energy is increasing As temperature increases kinetic energy increases intermolecular force is Related to potential energy. So as we move through this melting part of the graph We are changing those intermolecular forces. We're absorbing heat of fusion. We're spreading the particles out We're weakening the intermolecular force. This amounts to a change in Potential energy So as it melts the potential energy changes the temperature stays constant So we know the kinetic energy staying constant, but there's still energy flow into it that energy is Changing the potential and the same thing happens up here boiling. This is a change in potential energy Again energy is still flowing into it, but what's happening is not a temperature increase the temperatures constant So we know that the kinetic energy is constant It's the potential energy that's changing whenever the states are changing and again, it's dealing with intermolecular forces Heat of vaporization is removing them and Because of that we see a change in potential Now one last thing We need to be able to do here is find the melting points and boiling points again. This is where it melts So we come over the y-axis and that's somewhere around 55 degrees Celsius Where the melting happens you find the melting point and the question asks for point Well, they want a number so make sure you give them a number Boiling is here about halfway between 90 and 100 so let's call it 95 degrees Celsius And again, you would just see where it's boiling come over here to the y-axis get that number This is the melting point because that's where melting is happening That's the boiling point because that's what boiling is happening And that should pretty much take care of everything you have to pull off of a heating curve