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### 24 Cards in this Set

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 Energy 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 Heat 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 Enthalpy 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 Fuel any substance that is burned or similiarly reacted to provide heat and other forms of energy Wavelength the distance between any two adjacent identical points of a wave Frequency 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