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Intro to Periodic Trends

Intro to Periodic Trends. About Energy and Spontaneity. Positive Energy Values. “+” energy values denote that energy must be ___________ the sytem in order to perform the process described. For example : being pushed up stairs. Negative Energy Values.

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Intro to Periodic Trends

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  1. Intro to Periodic Trends About Energy and Spontaneity

  2. Positive Energy Values • “+” energy values denote that energy must be ___________ the sytem in order to perform the process described. • For example: being pushed up stairs

  3. Negative Energy Values • “-” energy values denote that energy is _____________ the system as the process described takes place. • For example: Falling down stairs

  4. 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

  5. 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

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

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