Which of the following is not true for an exothermic reaction? A Heat flows from

Question

Which of the following is not true for an exothermic reaction? A Heat flows from the reaction system to the surroundings. B. The temperature of the surroundings rise. C The enthalpy change for the reaction is negative. D. The products have a higher cnergy than the reactants E. The bonds in the products are stronger than the bonds in the reactants. Which of the following reactions is the most kely to be excthemic? D. G@ +e. ( The bond strength bet ween Cand a halogen decreases down the halogen group in the periodic table. Based on ths trend predict whichi of the folowing gases hax the lurgest (most negative) enthalpy of atom combination? A. B. CBr. D. CI E. They all have the same enthalpy of atom combination Which of the fallowing reactions will have a pesiive AS? E. none of these Carbonated beverages can be made by bubbling carbon dioxide gas through the aqueous beverage and allowing the carbsa dioxide to dissove. Predict the signs ot AH° and As tor the following reaction without using tables. B.

Explanation / Answer

1-D- products can not be higher in energy, if that is the case, we will need to supply energy to the system that means the reaction should be endothermic.

2- D-electron affinities are always exothermic. other options cannot be correct, because in some of them bond is getting broken.

3-C-since bond strength is decreasing down the group, product stabilization should lower down the group.

4- B- Since solid to liquid transition is there, solid have lower entropy than liquids, and liquids have lower entropy than gases.

5- C- entropy change obviously will be negative because gases to aqueous transition is there. Further CO2 in water is e exothermic reaction because of formation of carbonic acid.

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