Week 1- Thermodynamics Flashcards
(42 cards)
What are the two sub-disciplines of thermodynamics?
Classical thermodynamics and statistical thermodynamics.
Describe classical thermodynamics:
Classical thermodynamics deals with bulks propertiens and consider the macroscopic properties of matter.
Describe statistical thermodynamics:
It also consider microscopic properties of matter and it refers to the probabilities of things happening at a molecular level.
What’s a system?
A system is anything contained within a boundary.
What are the 3 types of system?
1) Open system 2) Closed System 3) Isolated system
Describe open system:
Open system can exchange both energy and matter with the sorroundings
Describe closed system:
Closed system exchange only energy with the sorroundings.
Describe isolated system:
Isolated system cannot exchange either energy or matter with the sorroundings.
What’s sorrounding?
Sorrounding is everything else in contact with the system.
What’s energy?
Energy is the capacity to do a work.
What are the two types of energy?
1) Kinetic Energy 2) Potential Energy (Gravitational and chemical)
What’s potential chemical energy?
Energy stored in molecules by virtue of their bond.
What does bond formation do?
Bond formation release energy
What does bond breaking do?
Bond breaking consumes energy
What are the two ways by which energy can be transfered from the system to the sorrounding?
1)Heat 2) Work
What’s heat?
Heat is energy dispersed in a random motion
What’s work?
Work is energy dispersed as non random motion
Describe the -1 law of thermodynamics:
Heat travels from hot to cold
Describe the 0 law of thermodynamics:
If the body A is in thermal equilibrium with the body B and the body B is in thermal equilibrium with body C then the body A is in thermal equilibrium with the body C.
What’s internal energy?
Internal energy is the total energy within a system
Describe the 1st law of thermodynamics:
The internal energy of an isolated system is constant
What does Enthalphy measures?
Enthalpy measures the energy change in a system.
What’s energy change?
Energy change is the difference between the energy consumed by the breaking of bonds and the energy release by the formation of bonds.
If ΔH is negative…
If ΔH is negative the reaction is exothermic, system loses energy and become more stable.