This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Question: Which of the following sets of conditions is true for an exothermic reaction that is spontaneous at all temperatures? A) AH 0, AS 0 D) AH > O, AS Correct option is C) G= H−T S. When S decreases; S=negative then G will be negative only when H is much more negative or exothermic ⇒ G=negative (spontaneous) It is not necessary for every reaction which is exothermic need to be decreased in S, there will be increase in S also. Was this answer helpful? Exothermic reactions involve release of heat energy. This means that the energy of the products is lower than the energy of the reactants. Entropy is the measure of disorder in a system. It does not depend on the enthalpy and can increase or decrease during an exothermic process. Spontaneity is determined by looking at the change in Gibbs free A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases (Figure 1). Exothermic and endothermic reactions can be thought of as having energy as either a product of Most of the naturally occuring processes are spontaneous. Exothermic reactions associated with a decrease in entropy are spontaneous at lower temperatures. Justify on the basis of Gibbs equation. Text Solution. View Solution (a) Decomposition reactions are always initiated with the supply of energy. Give appropriate reasons Conclusion. In conclusion, exothermic reactions are spontaneous processes that release energy in the form of heat. They occur when the Gibbs free energy is negative, which means that the products are more stable than the reactants. Endothermic reactions also occur naturally and spontaneously, but they absorb energy instead of releasing it Exergonic reactions are also called spontaneous reactions, because they can occur without the addition of energy. Reactions with a positive ∆ G (∆ G > 0), on the other hand, require an input of energy and are called endergonic reactions. In this case, the products, or final state, have more free energy than the reactants, or initial state
What is an example of a non-spontaneous, exothermic reaction?
Exothermic Reaction: When methane gas is combusted, heat is released, making the reaction exothermic. Specifically, the combustion of 1 mol 1 mol of methane releases The energy released in this nuclear reaction is more than , times greater than that of a typical chemical reaction, even though the decay of 14 C is a relatively low-energy nuclear reaction. Because the energy changes in nuclear reactions are so large, they are often expressed in kiloelectronvolts (1 keV = 10 3 eV), megaelectronvolts (1 MeV =
16.13: Including the Surroundings - Chemistry LibreTexts
The teacher’s final comment to Sam and Julie about this experiment is, “When trying to classify a reaction as exothermic or endothermic, watch how the temperature of the A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. A roaring bonfire is an example of a A spontaneous process is an irreversible process and it could only be reversed by some external agents. The entropy of any system is defined as the degree of randomness in it.