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Showing revision 5
1st Lecture
- 3 Laws of Thermodynamics (Thermo)
- 1st Law of Thermo, Conservation of Energy
- Many ways of talking Energy, Two types, Kinetic energy (KE) and Potential energy (PE)
- 2nd Law Thermo (not true definition but ours), Explains how energy moves.
- Energy flows from a higher temperature body to a lower temperature body until the temperatures are the same.
- Need to define Temperature - average Kinetic energy (KE) of all the particles in a substance
- 3rd Law of Thermo, Condition of No Energy
- Absolute zero is the condition of no energy that requires 0K (0 Kelvin temperature, no movement or KE of particles) and a perfect crystal.
- Can't reach absolute zero, so all substances or systems have energy.
Note: You can not measure or quantify how much energy a system or substance unless it is flowing.
2nd Lecture
1st Law of Thermo
- Equation of KE and types of KE
- Temperature - Average kinetic energy (KE) of all the substance in a particle. Definition means that not all particles in a substance has the same KE. So have more KE than others.
- Types of PE
2nd Law of Thermo
- Ethalphy (H) - including energy of movement of particles from temperature, phase substance in, and energy keeping material that compose of the particle together (i.e. bond energy)
- Energy and chemical reactions
- Endothermic reaction -
- Exothermic reaction -
- Activitation energy
- Spontaneous reaction - reaction that procedures without outside influence/energy added.
- So no endothermic reaction can be spontaneous !!!! No, not correct. There is another energy component, Entropy.
- Entropy and why you need a perfect crystal to be at absolute zero