For a reaction to be spontaneous, ΔG must be negative. In exothermic reactions, ΔH is negative (due to the release of energy), and if the increase in entropy (ΔS) is positive, this can lead to a negative ΔG, making the reaction spontaneous. Step 5/6 4. Reaction rate: Although not all exothermic reactions are necessarily fast, many of them Most spontaneous chemical reactions are exothermic - they release heat and warm up their surroundings: for example: burning wood, fireworks, and alkali metals added to This is kind of weird, I thought that usually at an higher temperature a reaction would be more spontaneous than at a lower temperature •. (22 votes) Upvote. Flag. lositk. 12 Correct option is C) A reaction which is spontaneous and accompanied by decrease in randomness is exothermic. In an exothermic reaction,the external entropy increases resulting in increase of randomness. So,Assertion is correct but Reason is incorrect. Solve any question of Chemical Thermodynamics with: Chemistry. Chemistry questions and answers. If a reaction is exothermic and non-spontaneous at 25 oC and 1 atm pressure, it may be spontaneous at higher temperatures. spontaneous at lower temperatures. endothermic at lower temperatures. endothermic at higher temperatures. nonspontaneous at all temperatures A reaction that is spontaneous and accompanied by decrease of randomness must be exothermic. Reason All exothermic reactions are accompanied by a decrease of randomness. A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. B For an exothermic reaction, the energy once located in the reactants is now spread out over the environment (which might be a large water bath or something of that nature). Are spontaneous exothermic reactions spontaneous due to more stable products or to an increase in the entropy of the surroundings?
Chapter 20 Lecture Notes - Oklahoma State University–Stillwater
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 is consistent with an exothermic reaction that is spontaneous at low temperatures? Group of answer choices ΔH > 0, ΔS 0 ΔH 0, ΔG 0, ΔS > 0, ΔG A) Exothermic reactions are spontaneous at all temperatures. B) Spontaneous reactions have negative AG values and larger equilibrium constant values (Kea). C) The total energy of the universe is constant. D) For spontaneous processes, the entropy of the universe always increases. E) Select the incorrect option about spontaneous exothermic reaction. Medium. View solution > The reaction is? Hard. Reason All exothermic reactions are accompanied by decrease of randomness. A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Hard. View solution > For an exothermic reaction So the Mg combustion is actually spontaneous. Anyway, a good example of what you're looking for is the Haber process. N2 (g) + 3H2 (g) -> 2NH3 (g). This reaction is exothermic but entropy decreases because you end up with fewer molecules in the mixture of gases. So at high temperatures this reaction is non-spontaneous For exothermic reaction: ΔH0, the temperature can have any value for reaction to be spontaneous. Because, ΔH0, So the ΔG Question: Which reaction is spontaneous at all temperatures at standard pressure and concentration? Select one: a. exothermic reaction with a decrease in entropy b. endothermic reaction with a decrease in entropy c. exothermic reaction with an increase in entropy d. endothermic reaction with an increase in entropy. There are 3 steps to solve
The Spontaneity of Exothermic Reactions
Statement II: Spontaneous reactions are exothermic. asked Dec 16, in Chemistry by Rajneesh01 (k points) class; 0 votes. 1 answer. Assertion (A): An exothermic process, non-spontaneous at high temperature, may become spontaneous at low temperature. Reason (R): With decrease in t Statement All exothermic Click here:point_up_2:to get an answer to your question:writing_hand:justify the following statementsa an exothermic reaction is always thermodynamically spontaneousb the entropy of a. Solve. Guides. the process will be non-spontaneous even if it is exothermic. (b) The entropy of vapour is more than that of liquid therefore entropy 1 Answer. Sorted by: 1. The spontaneity of a reaction is given by ΔG Δ G. ΔG spontaneous reaction. ΔG > 0 Δ G > 0 = nonspontaneous reaction. ΔG