BIOSC 1000 Lecture Notes - Lecture 2: Equilibrium Constant, Chemical Equilibrium, Micelle
Document Summary
14. 5 c to 15. 5 c kilocalorie (kcal) = 1000 cal 1 kj = 0. 239 kcal. Biological systems biological systems are open systems share energy and matter with their surroundings there are two ways a system can exchange energy with surroundings heat and work osmotic work, synthetic work, etc. Energy transformations in organisms chemical transformations, heat release, changing entropy, etc. Three thermodynamic quantities describe the energy changes occurring in a chemical reaction: entropy (s, enthalpy (h, gibbs free energy (g) Properties of state or state functions only depend on start and end determined only by the starting and ending conditions. Enthalpy (h) heat of the reaction in biological systems negative change in enthalpy. H = heat has been released to the surroundings (exothermic) + h = heat is taken up from surroundings (endothermic) Gibbs free energy (g) amount of energy from a reaction that can do work release g, driving force of a reaction, can do work.