Double what causes a reaction to be spontaneous? provide an example in your explanation.
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A chemical reaction is considered spontaneous if A) the reaction releases heat, and B) if the entropy of the system increases. There is a formula known as the Gibbs Free Energy equation that predicts whether or not a reaction will be spontaneous; this formula considers the enthalpy side (heat) and the entropy side (disorder) of the reaction when making the prediction.

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c, liquids evaporate, creating a gas

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.