Glossary of CHE 106

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The potential or capacity to move matter
Kenitic Energy
the energy associated with an object by virtue of its motion
Potential Energy
the energy an object has by virtue of its position in a field of force
Law of Conservation of Energy
energy may be converted from one fomr to another but the total quantuty of energy remains constant
the energy that flows into or out of a system because of a difference in temperature between the thermodynamic system and its surroundings
Exothermic Process
a chemical reaction or a physical change in which heat is evolved
Endothermic Reaction
a chemical reaction or a physical change in which heat is absorbed
an extensicve property of a substance that can be used to obtain the heat absorbed or evolved in a chemical reaction (H)
State Function
a prperty of a system that depends only on its present state, which is determined by variables such as temperature and pressure and is independant of any previous history of the system
Enthalpy of Reaction
the change in enthalpy for a reactio at a given temperature and pressure
Heat Capacity
the quantity of heat needed to raise the temperature of the sample of substance one degree Celsius
Specific Heat
the quantity of heat required to raise the temperature of one gram of a substance by one degree Celsius at constant pressure
Standard Enthalpy of Formation
is the enthalpy change for the formation of one mole of te substnace in its standard state from its elements in their reference form and in their standard states
any substance that is burned or similiarly reacted to provide heat and other forms of energy
the distance between any two adjacent identical points of a wave
the number of wavelengths of that wave that pass a fixed point in one unit of time
Planck's Constant
a physical constant with the value 6.63 x 10^-34
Electromagnetic Spectrum
the range of wavelengths or frequencies of electromagnetic radiation
Atomic Orbital
a wave function for an elctron in an atom
Principal Quantum Number (n)
this quantum number is the one on which the energy of an electron in an atom principally depends; it can have any positive value 1,2,3 and so on
Angular Momentum Quantum Number (l)
this quantum number distinguishes orbitals of given n having different shapes; it can have any integar value from 0 to n-1
Magnetic Quantum Number (m^l)
this quantium number distinguishes oritals of given n and l that is of given energy and shape but having a different orientation in space; allowed values are the integers from -l to +l
Spin Quantum Number (m^s)
this quantum number refers to the two possible orientations of the spin axis of an electron; possible values or 1/2 and -1/2
Hund's Rule
states that the lowest-energy arrangement of electron in a subshell is obtained by putting electrons into seperate orbitals of the subshell with the same spin before pairing electrons

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