What is revealed in the reaction Ca(OH)2(s) Ca2+(aq) + 2OH-(aq),H = -16.71?A.The reaction produces heat.B.The reaction occurs slowly.C.The reaction is endothermic.D.Heat is one of the reactants.
Question
What is revealed in the reaction Ca(OH)2(s) Ca2+(aq) + 2OH-(aq),H = -16.71?A.The reaction produces heat.B.The reaction occurs slowly.C.The reaction is endothermic.D.Heat is one of the reactants.
Solution
The answer is A. The reaction produces heat. This is indicated by the negative sign in front of the enthalpy change (H = -16.71). In chemistry, a negative enthalpy change signifies an exothermic reaction, which means heat is released.
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