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SAT Chemistry

Category - Multiple Choice

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Which of the following conditions guarantees that a reaction will occur spontaneously in the forward direction?

The temperature is negative
Change in enthalpy is positive
Change in entropy is negative
Change in Gibbs free energy is negative
Change in temperature is positive

Explanation

Answer: Change in Gibbs free energy is negative

A spontaneous process always moves from higher energy reactants to lower energy products. Therefore, the difference in energy between the products and the reactants is negative. Thus, a negative change in Gibbs free energy guarantees a spontaneous reaction in the forward direction.

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