Introduction:
In order to understand why a particular reaction may become spontaneous at higher temperatures, we need to consider the concepts of enthalpy (ΔH) and entropy (ΔS). ΔH represents the change in heat energy during a reaction, while ΔS represents the change in disorder or randomness. The spontaneity of a reaction is determined by the Gibbs free energy change (ΔG), which is given by the equation ΔG = ΔH - TΔS, where T is the temperature in Kelvin.

Explanation:
When ΔH is positive and ΔS is positive, it indicates that the reaction absorbs heat and becomes more disordered, respectively. At lower temperatures, the term -TΔS dominates the equation, making the ΔG value positive and the reaction non-spontaneous. However, as the temperature increases, the term -TΔS becomes more significant, eventually surpassing the ΔH term. This leads to a negative ΔG value, indicating that the reaction becomes spontaneous at higher temperatures.

Key Points:
1. ΔH > 0 indicates that the reaction is endothermic, meaning it absorbs heat from the surroundings.
2. ΔS > 0 indicates that the reaction becomes more disordered or random, increasing the system's entropy.
3. At lower temperatures, the term -TΔS dominates the Gibbs free energy equation, making ΔG positive and the reaction non-spontaneous.
4. Increasing the temperature causes the -TΔS term to become more significant, eventually surpassing the ΔH term.
5. At higher temperatures, the ΔG value becomes negative, indicating that the reaction becomes spontaneous.
6. This phenomenon can be explained by the relationship between enthalpy, entropy, temperature, and Gibbs free energy.

Conclusion:
In summary, a particular reaction with positive ΔH and positive ΔS values may initially be non-spontaneous at lower temperatures. However, as the temperature increases, the effect of the -TΔS term in the Gibbs free energy equation becomes more significant, leading to a negative ΔG value and making the reaction spontaneous. The relationship between enthalpy, entropy, temperature, and Gibbs free energy helps explain this behavior.

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