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Intro to Periodic Trends

This introduction to periodic trends explores energy values in chemical processes. Positive energy values indicate that energy must be absorbed by the system, while negative values suggest energy is released. Processes absorbing energy lead to less stable matter, while those releasing energy result in more stable configurations. Spontaneous processes release energy readily, whereas non-spontaneous processes require energy input. Through examples, like moving up and down stairs or interactions of magnets, we clarify these concepts in relation to energy and stability.

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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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