Chemistry Practice Problems Endothermic & Exothermic Reactions Practice Problems Solution: Which of the following is an endothermic process? ...

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Solution: Which of the following is an endothermic process?  (1) Chlorine gas expands while keeping a constant temperature. (∆E = 0) (2) Freezing gaseous carbon dioxide into dry ice at 194.7 K (3) Hydrogen peroxide decomposes to more stable products (4) An electric current breaks water down into H2 and O2

Problem

Which of the following is an endothermic process? 

(1) Chlorine gas expands while keeping a constant temperature. (∆E = 0)

(2) Freezing gaseous carbon dioxide into dry ice at 194.7 K

(3) Hydrogen peroxide decomposes to more stable products

(4) An electric current breaks water down into H2 and O2