 Okay, so we just did this SN1 reaction, let's draw the energy diagram for it. So notice the rate is this, the rate determining step is this first step, right? So we want to keep that in mind. So let's just write rate determining step right there. And I am just going to erase most of this. Okay, you're going to have to remember that it's the rate determining step. So we're starting with this secondary alkyl halide, and we want to draw the reaction coordinate. So, on this axis, what's going to be, what's this axis? Your energy. Oftentimes we write it as what? Delta G. And here, what's here? Reaction. Reaction, progress. And then, since you guys asked me, we've done one of these before, so I want you guys to help, okay? So, what's going to be on this side of the reaction coordinate, and what's going to be on this side? Reactions and products, okay? So, reactants are going to be up there, products are going to be down there. So when Delta G is negative, then reactants will be at the bottom? When Delta G is negative, the products will be at the bottom. Products will be below the reactants if Delta G is negative, right? So look, let's just do that right now. So, Delta G started here, and ended here. So did it become more positive or more negative? So, if you start with $100 and you end up with $3, what happened to your dollars? Lost money. So that's more negative, right? So put things into terms that we can understand. It helps out. So Delta G, in this case, is what? Negative. Negative, okay. Okay, so how many steps does this SN1 reaction have if you go back and look at your notes? Two. Two, right? So how many hills are we going to have? Two. Two. And the first one or the second one is going to be bigger? First one. First one. Why is that? It's already determined. Okay, so let's label some portions of this graph. So what's up here? Transition state. Yeah, the transition state. This one is transition state one, right? And what do we call the energy difference from here to here? Activation energy. The activation energy. Is the activation energy positive or negative? Positive. Positive. Okay? So oftentimes this will be like Delta G double-danger or EA, whichever one you prefer is fine. What about here? What's this going to be called? Transition state two. Transition state two again. And what about the energy from here to here? Delta G double energy. So that's the what? Activation energy. Activation energy going from this thing, which is the what? Intermediate. Intermediate. From the intermediate to that transition state. So these transition states, are these actual like molecules or particles? Delta. Uh-uh. So they're just transient states, okay? So it's where your slope goes from positive to negative. At that zero point you get your transition states. These intermediates are these actual things? Yes. Yes, okay? They're high energy, of course. Very reactive, but potentially isolable, okay? In Sn1 reactions, what is the identity of the intermediate carbocation? It's a carbocation. Okay? So let's just say the intermediate carbocation. So is this reaction going to be endergonic or exergonic? Exergonic. Exergonic, right? Why is that? Because Delta G is negative. Anything else you want to ask about this thing? I have a question about that in particular, but I'm wondering since tertiary aquaids didn't form either Sn1 or Sn2. A secondary can. A secondary. Uh-huh. Since tertiary didn't have a secondary. If you have a reaction, how will we be able to identify between two? Would you just have like an acid in a base? Well that's a good question. Does anybody know how you would identify it? The secondary would go Sn1 or Sn2? We'd do some. Yeah, nucleophile, right? So oftentimes we talked about the weak nucleophile and the Sn1 reaction just being the solvent. So if you only see the solvent in the reaction, then it's probably going Sn1, okay? If you have a strong nucleophile in a non-polar solvent, okay, it's going to go Sn2. Any other questions that could kill it? Okay. Good job guys.