Which best describes H2 (g) + cl2 (g) - - > 2hci (g), h = - 184.6 kJ/mol?

A. the reaction has no activation energy.

B. the reaction is endothermic.

C. the reaction requires heat.

D. the reaction produces heat.

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A chemical reaction that takes in heat is called: exothermic endothermic a phase change