Practice Quiz

IB Chemistry Test Prep

Category - IB Chemistry

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Which of the following conditions guarantees that a reaction will occur spontaneously in the forward direction?
  1. The temperature is negative
  2. Change in enthalpy is positive
  3. Change in entropy is negative
  4. Change in Gibbs free energy is negative
  5. 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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