Class Notes (808,754)
Canada (493,378)
Biology (976)
BI110 (458)
Lecture 14

BI110 Lecture 14: Biology Note 14 (module 22 pt 2)

3 Pages
Unlock Document

Wilfrid Laurier University
Matthew Smith

Module 22 - Metabolism continue Chemical Reactions - Gibbs Free Energy (g) can be calculated for any molecule * (already noted) aA+bB < --- > cC+dD - The G of A+B = G initial - The G of C+D = G final - DeltaG for the reaction can be calculated: G final initial Gibbs free energy - In exergonic reactions (top), met change in Gibbs free energy is negative (deltaG < 0), and energy is released from system. - In endoergonic reactions (bottom), net change in Gibbs free energy is positive (deltaG>0), and energy must be added to system. - Gibbs free energy on the Y axis Exergonic and Endoergonic Reactions - No 2 reactions are the same - Magnitude of delta G matters Spontaneous Reactions (-deltaG) - Spontaneous doesn’t necessarily mean QUICK; it means energetically favourable deltaG = deltaH – TdeltaS - Two factors can give rise to –deltaG, and therefore spontaneous reactions  Negative deltaH (the system gives up potential energy )  Products are less ordered than reactants --Large positive deltaS (the system gives up order – entropy increases) Free Energy (deltaG) - When energy is released it can be harnessed to do work Chemical Reactions, Free energy, stability and Equilibrium - Equilibrium is maximum stability (most stable state) - Picture: Glucose 1 phosphate  spontaneous converted to Glucose 6 phosphate - no matter how much of glucose 1 phosphate you start with.. it will always try to get to their equilibrium - Equilibrium point is reached when reactants are converted to products and products are converted back to reactants at equal rates  delta G = 0 • Reactants are continuously coming in and products are continuously being taken out (being used by other pathways) Free Energy Summary - Free energy changes when the potential energy and/ or entropy of substance change - Chemical reactions run in the direction that lowers the free energy of the system (trying to get to the most stable state) - Exergonic reacti
More Less

Related notes for BI110

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.