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

Question

Quizplus · Accepted Answer

The process of Ca(s) → Ca(g) is endothermic as energy is required to break the bonds holding the solid together and transform it into a gaseous state. Choices A, B, and D are all exothermic processes as energy is released in the form of heat or light. Therefore, the correct answer is C.

Which of the Following Processes Is Endothermic