How does temperature affect the spontaneity of a reaction?A.Increasing the temperature always makes a reaction more likely to be spontaneous.B.Increasing the temperature always makes a reaction less likely to be spontaneous.C.Increasing the temperature will not affect the spontaneity of a reaction.D.Increasing the temperature makes a reaction spontaneous in some situations.SUBMITarrow_backPREVIOUS
Question
How does temperature affect the spontaneity of a reaction?A.Increasing the temperature always makes a reaction more likely to be spontaneous.B.Increasing the temperature always makes a reaction less likely to be spontaneous.C.Increasing the temperature will not affect the spontaneity of a reaction.D.Increasing the temperature makes a reaction spontaneous in some situations.SUBMITarrow_backPREVIOUS
Solution
The effect of temperature on the spontaneity of a reaction is not always straightforward. It can make a reaction spontaneous in some situations, but not in others. This is because the spontaneity of a reaction is determined by both enthalpy (ΔH) and entropy (ΔS) changes, according to the Gibbs free energy equation: ΔG = ΔH - TΔS.
If a reaction is exothermic (ΔH < 0) and increases the disorder of the system (ΔS > 0), it will be spontaneous at all temperatures. However, if a reaction is endothermic (ΔH > 0) and decreases the disorder of the system (ΔS < 0), it will not be spontaneous at any temperature.
For reactions where ΔH and ΔS have opposite signs, the effect of temperature becomes crucial. If a reaction is endothermic and increases the disorder (ΔH > 0, ΔS > 0), it will be spontaneous at high temperatures. Conversely, if a reaction is exothermic and decreases the disorder (ΔH < 0, ΔS < 0), it will be spontaneous at low temperatures.
So, the correct answer is D. Increasing the temperature makes a reaction spontaneous in some situations.
Similar Questions
How will temperature affect the spontaneity of a reaction with positive H and S?A.It will be spontaneous only at T = H/S.B.A low temperature will make it spontaneous.C.Changing the temperature will not affect spontaneity.D.A high temperature will make it spontaneous.
How do changes in temperature affect the rate of a reaction?A.Increasing temperature increases the reaction rate because the particles move faster and collide more often.B.Increasing temperature decreases the reaction rate because the particles break down into nonreactive substances.C.Decreasing temperature increases the reaction rate because the particles are more likely to react when they collide.D.Changing temperature does not affect the rate of a reaction because it does not change the activation energy.
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At what temperatures is a reaction that has a positive change in entropy spontaneous?A.At lower temperatures for endothermic reactionsB.At no temperatures for exothermic reactionsC.At all temperatures for exothermic reactionsD.At all temperatures for endothermic reactions
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