Which of the following processes is endothermic? A) Na⁺(g) + Cl⁻(g) → NaCl(s) B) 2 F(g) → F₂(g) C) Ca(s) → Ca(g) D) 2 K(s) + O₂(g) → K₂O(s) E) None of the above is endothermic.

Question

Quizplus · Accepted Answer

The process of Ca(s) → Ca(g) is endothermic because it requires energy input to overcome the attractive forces holding the solid together and break the bonds to transform it into a gas. Choices A, B, and D are all exothermic because they release energy in the form of heat or light. Choice E is incorrect because there is at least one endothermic process among the options.

Which of the Following Processes Is Endothermic