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#chemical thermodynamics

2 public questions tagged with this topic.

For the reaction Hâ‚‚(g) -> 2H(g), what is the entropy change?

Entropy increases as one molecule dissociates into two atoms, increasing disorder. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

In an exothermic reaction, the energy profile diagram shows:

Products have lower energy than reactants is the scientifically accurate answer to this question. Within the study of Kinetics and Thermodynamic, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Products have lower energy than reactants directly address what is being asked. Among the other options, Products have higher energy than reactants, Activation energy is zero, and Reaction proceeds at a constant energy level do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Campbell Biology, Urry et al., 12th Ed.