Which of the following processes is endothermic? A) K⁺(g) + I⁻(g) → KI(s) B) 2Br(g) → Br₂(g) C) Ca(s) → Ca(g) D) 2Na(s) + O₂(g) → Na₂O(s) E) None of the above processes is endothermic.

Question

Quizplus · Accepted Answer

The process of Ca(s) → Ca(g) involves the breaking of metallic bonds, which requires energy input and makes it endothermic. The other processes either involve bond formation (A and D) or sublimation (B), both of which are exothermic.

Which of the Following Processes Is Endothermic