Thermodynamics and energy, Biology

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Thermodynamics and Energy

2 types of energy (kinetic and potential)
Work is the transfer of energy from one place to another
Energy isn't lost, only converted è first law of thermodynamics
Bond energy is the measure of the stability of a covalent bond
Activation energy à the energy it takes to reach the transition state
Transition state à the temporary condition in which the bonds of the reactants are breaking and the bonds of the products are forming

The Combustion Accountant

1. Draw out molecule to see all bonds

2. Take each type of bond

a. Energy produced x # of bonds

3. Add the energy of the molecule

4. Do this for all reactants and then again for all products

5. Add the energy of the reactants together (same with products)

6. Take the ΔH_products- ΔH_reactants= 'actual' yeild

7. Find the theoretical yield (in appendix or given)

8. ^{Theoretical - actual} / _actualx 100% = percent difference

ΔH->enthalpy à energy change in a reaction (negative is exothermic and positive is endothermic)
- Exogonic reactions are more spontaneous then endogonic ones
ΔS-> Entropy à the measure of the disorder in a system
- Increase in entropy is favoured
Gibbs free energy ΔG
- Useful energy that can perform work
Energy will be lost as heat when converted è second law of thermodynamics
Metabolic processes are reversible

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