1st Law Flashcards
- study of relationships involving heat, mechanical work and other aspects of energy and energy transfer
- deals w/ heat and temp. and the interconversion of heat and other forms of energy.
THERMODYNAMICS
involve changes in the state of thermodynamic systems
Thermodynamic Processes
part of the universe in which observations are made, and the remaining universe constitutes the surroundings
Thermodynamic system
REMEMBER:
Universe = system + surroundings
…
is embedded in its environment surroundings, thru which it can exchange heat and do work on
Thermodynamic system
We describe the energy relations in any thermodynamic process in terms of the ___________, added to the system and the ___________, done by the system.
quantity of heat, Q
work, W
extension of the principle of conservation of energy
first law of law of thermoynamics
3 classifications of thermodynmamics
open system (matter and energy can leave or enter)
closed system (only energy can leave/enter)
isolated system (energy nor matter cannot leave/enter )
TRUE/FALSE
In any system in which the volume is constant, the system does work on the surroundings.
FALSE ( does no work)
series of intermediate states where a thermodynamic system passes thru as it changes from initial to final state
path
TRUE/FALSE
heat and work done by the system depends not only on the initial state and final state but also on the intermediate states, that is, on the path.
TRUE
sum of the total KE of all its constituent particles and all the total potential energy of interaction among these particles
Internal energy ( U )
When a quantity of heat Q is added to a system which does no work, its internal energy _______ by an amount equal to _________
increases
Q
When the system does work, W, and no heat is added during the process, energy leaves the system and the internal energy _______
decreases
TRUE/FALSE
Change in internal energy is independent of path
TRUE
process that eventually returns a system to its initial state
cyclic process
In an ________system, there is no work done on its surroundings and no heat flow to or from its surroundings.
isolated
TRUE/FALSE
Internal energy of an isolated system is constant
TRUE
“energy cannot be created or destroyed, only converted from one form to another”
Conservation of energy
First law of thermodynamics
this law of thermodynamics states that the energy of the universe remains the same
First law of thermodynamics
Kinds of thermodynamics processes
- adiabatic process
- isochoric “
- isobaric “
- isothermal “
process with no heat transfer into and out of the system
ADIABATIC PROCESS
- a constant-volume process
- in this process, all the energy added to the system as heat is used to increase its internal energy.
ISOCHORIC PROCESS
a constant-pressure process
ISOBARIC PROCESS
a constant-temperature process
ISOTHERMAL PROCESS
path followed in an adiabatic process
ADIABAT
path followed in an ISOCHORIC process
ISOCHOR
path followed in an isobaric process
ISOBAR
path followed in an isothermal process
isotherm
