Which of the following statements are correct aboutcontrolling chemical reaction

Question

Which of the following statements are correct aboutcontrolling chemical reactions ?
a) At low temperatures, an exothermic reaction usually favors theformation of products. b) At high temperatures, an decrease in entropy favors theformation of products. c) Reactions occur more rapidly at high temperatures that atlow temperatures. d) When a solid material is used as a reactant, the reactonwill prooceed faster when the solid particles are made as small aspossible. e) Catalysts are rarely used in large industrial chemicalprocesses. MORE THAN 1 MAYBE CORRECT Which of the following statements are correct aboutcontrolling chemical reactions ?
a) At low temperatures, an exothermic reaction usually favors theformation of products. b) At high temperatures, an decrease in entropy favors theformation of products. c) Reactions occur more rapidly at high temperatures that atlow temperatures. d) When a solid material is used as a reactant, the reactonwill prooceed faster when the solid particles are made as small aspossible. e) Catalysts are rarely used in large industrial chemicalprocesses. MORE THAN 1 MAYBE CORRECT

Explanation / Answer

The most correct answer out of the choices is (d). When you makethe solid particle as small as possible, it increases the surfacearea over which the reaction can take place, thus the reactionhappens more quickly. (e) is most certainly wrong, since catalystsspeed up reaction rate, industries use them frequently in theirchemical processes. Since raising the temp for an exothermicreaction favors reactants, it is logical that at "low temperatures"an exothermic reaction would favor products, so logically (a)should be correct. (b) depends on what the products are; whetherthey are more or less entropic than the reactants. Generally,reactions occur more rapidly at high temps than at low ones, so (c)is generally correct also. Summary: (a), (c), and (d) should be correct.

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