Thermodynamics 1 Flashcards
Define energy
The capacity to supply heat or do work
Define kinetic energy
The energy of motion
Define potential energy.
Stored potential energy
Define thermal energy.
The kinetic energy of molecular motion, measured by finding the temperature of an object.
Define heat.
The amount of thermal energy transferred from one
object to another as the result of a temperature difference between the two.
Define Law of Conservation of Energy
Energy cannot be created
or destroyed; it can only be converted from one form to
another.
What are isolated systems.
They can neither do work upon nor heat their surroundings.
This means that their internal energies cannot change
Describe the internal energy of an isolated system.
It is constant
Define an exothermic process.
a change (e.g. a chemical reaction) that
releases heat.
A release of heat corresponds to a decrease in enthalpy.
Define endothermic process.
a change (e.g. a chemical reaction) that
requires (or absorbs) heat.
An input of heat corresponds to an increase in enthalpy.
Define enthalpy.
The measurement of energy
in a thermodynamic
system.
Define an open system.
Can exchange both matter and energy with the surroundings.
Define a closed system.
Can exchange only energy with the surroundings.
Define isolated system.
Can exchange neither energy nor matter with its surroundings.
Define state function.
A function or property whose value depends
only on the present state, or condition, of the system, not on the path used to arrive at that state.
