Intro to Periodic Trends About Energy, Stability and Spontaneity

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Positive Energy Values “+” energy values denote that energy must be ___________ the system in order to perform the process described. These processes are called _______________. For example: being pushed up stairs, electrons being excited in atom

Negative Energy Values “-” energy values denote that energy is _____________ the system as the process described takes place. These processes are called _______________. For example: Falling down stairs, electrons returning to ground state

Energy and Stability A process in which energy is absorbed (+ energy) results in matter which is ________ stable than the starting matter. For example: being pushed up stairs OR 2 north poles of magnets aimed at each other

Energy and Stability A process in which energy is released (- energy) results in matter which is ________ stable than the starting matter. For example: falling down stairs OR north and south poles of magnets aimed at each other

Spontaneity A process that requires energy is a ______________ process. i.e. Does not occur readily A process that releases energy is a ____________ process. i.e. occurs readily

Overview Positive Energy – Endothermic – Energy Absorbed – Less Stable Particle – Non-spontaneous Process Negative Energy – Exothermic – Energy Released – More Stable Particle – Spontaneous Process