0:02 hi everyone uh we're going to start our
0:04 next chapter and it's going to be about thermochemistry
0:05 thermochemistry
0:08 so our learning outcomes for this chapter
0:09 chapter
0:11 are listed right here so we want to make
0:13 sure that we can define and distinguish
0:15 between different types of energy
0:17 and describe the nature of energy
0:19 changes we want to think about the
0:20 differences between heat
0:23 thermal energy and temperature we also
0:25 want to define
0:27 and distinguish between specific heat
0:29 and heat capacity
0:31 and describe the the kind of
0:33 calculations and implications
0:37 of those we also want to spend a lot of time
0:37 time
0:40 with lots of practice on how to perform
0:42 those kinds of heat capacity type calculations
0:43 calculations
0:45 and we also are going to work towards uh
0:46 looking at
0:49 calorimetry and how we can do the
0:51 calculations to understand how
0:54 our reactions uh work
0:58 so thermochemistry is all about how heat
1:01 is absorbed or released during chemical
1:02 and physical changes
1:06 so thinking about our moles of a
1:09 going to moles of b we've already
1:12 looked at this kind of transformation
1:15 and looking at stoichiometry
1:17 and using our balanced chemical
1:19 equations but what we're going to do now
1:22 is we're going to do a little side track
1:23 over here
1:26 we can also understand how heat moves in
1:28 between our reactions
1:34 and all of our thermochemistry
1:37 so here's some definitions that we are
1:38 going to use for today
1:42 energy is the capacity to supply heat or
1:45 to do work work is a very important
1:47 concept for thermochemistry
1:50 because we are going to cause some sort
1:51 of matter
1:54 to move against some sort of force so we
1:56 will see this quite a bit you may see a
1:59 gas that's expanding against the piston
2:01 but in most cases we're looking at the
2:02 kind of work
2:05 that our chemical reactions can do
2:06 particularly with things like redox reactions
2:07 reactions
2:10 kinetic energy is uh sometimes
2:14 illustrated with a ke on here and this
2:16 is all the energy of motion
2:18 so when things are moving around what
2:20 kind of energy
2:22 potential energy is where we start to
2:23 think about
2:32 so just by how a system sits
2:35 at a specific time may have some sort of energy
2:36 energy
2:38 so we're thinking about things like
2:40 storage of energy
2:41 so something that comes to mind are
2:44 things like batteries
2:48 and also if you have some sort of object
2:51 at a higher level
2:54 so before an object actually drops it
2:57 has potential energy
2:59 so the last concept that is really
3:01 important and really the crux of what
3:03 we're doing in terms of this section's
3:05 work it's a lull of conservation of energy
3:06 energy
3:08 and this is where energy can only be transferred
3:22 so that is what we're really going to
3:24 look at in terms of the work we're doing
3:25 in this section
3:27 is how our different energies are going
3:29 to transform based on our chemical reactions
