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

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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

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