Today’s post will be a slight departure from cell biology and genetics and will focus, instead, of some of the basics of biochemistry. It is true that I disliked biochemistry, and that’s putting it lightly, but it’s still something that is important (how important is another question) to understand. I took a few days off from updating but I return with more review fun. This set of posts will include a number of equations that I will summarize after all of the thermodynamics notes have been posted. Also, the illustrations for these posts will be simplistic, but if you have some better ideas of how to illustrate thermodynamics, I'd like to know because I'm coming up with nothing...
ΔH = ΣHproducts - ΣHreactants
Endothermic reactions are those that absorb heat (ΔH > 0); exothermic reactions release heat energy (ΔH < 0). Adding heat will affect the equilibrium of the reaction (whether it favors products or reactants). Because endothermic reactions require energy for the reaction to occur, raising the temperature favors the reactants forming products. Conversely, adding heat to an exothermic reaction will favor the formation of reactants from products because, in fact, heat is a product of the reaction.
ΔS = ΣSproducts - ΣSreactants