hi everyone uh we're going to start our next chapter and it's going to be about thermochemistry so our learning outcomes for this chapter are listed right here so we want to make sure that we can define and distinguish between different types of energy and describe the nature of energy changes we want to think about the differences between heat thermal energy and temperature we also want to define and distinguish between specific heat and heat capacity and describe the the kind of calculations and implications of those we also want to spend a lot of time with lots of practice on how to perform those kinds of heat capacity type calculations and we also are going to work towards uh looking at calorimetry and how we can do the calculations to understand how our reactions uh work so thermochemistry is all about how heat is absorbed or released during chemical and physical changes so thinking about our moles of a going to moles of b we've already looked at this kind of transformation and looking at stoichiometry and using our balanced chemical equations but what we're going to do now is we're going to do a little side track over here we can also understand how heat moves in between our reactions so how heat moves and all of our thermochemistry so here's some definitions that we are going to use for today energy is the capacity to supply heat or to do work work is a very important concept for thermochemistry because we are going to cause some sort of matter to move against some sort of force so we will see this quite a bit you may see a gas that's expanding against the piston but in most cases we're looking at the kind of work that our chemical reactions can do particularly with things like redox reactions kinetic energy is uh sometimes illustrated with a ke on here and this is all the energy of motion so when things are moving around what kind of energy potential energy is where we start to think about uh energy by uh by position so just by how a system sits at a specific time may have some sort of energy so we're thinking about things like storage of energy so something that comes to mind are things like batteries and also if you have some sort of object at a higher level so before an object actually drops it has potential energy so the last concept that is really important and really the crux of what we're doing in terms of this section's work it's a lull of conservation of energy and this is where energy can only be transferred it can't be created so that is what we're really going to look at in terms of the work we're doing in this section is how our different energies are going to transform based on our chemical reactions