University:
Felician University
Course:
PHYS-355 | Advanced Topics in Physics
Academic year:

2022
Views:

137

Pages:

2
Author:

Giselle A.

Gibb's Free Energy Worksheet 1. Identify each of the variables in Gibbs' Free Energy equation. What does each stand for? ΔG: Gibbs Free Energy - spontaneous/nonspontaneous ΔH: Enthalpy - exothermic/endothermic ΔS: Entropy - disorder 2. How do you know if a reaction is exothermic or endothermic? Exo: Heat is product Endo: Heat is reactant 3. Is the following reaction exothermic or endothermic? How do you know? 2Na + Cl2 + 546 J → 2NaCl Endothermic; heat is listed as a reactant. 4. Use the data below to determine if the following reactions are spontaneous/nonspontaneous, endothermic/exothermic, increase/decrease in entropy. 1 1. userfiles-secure.educatorpages.com userfiles-secure.educatorpages.com a) ΔH = -11230 J ΔS = 345 J/K T = 313 K ΔG = -11230 - (345)(313) = -107985 J Spontaneous (ΔG = -) Exothermic (ΔH = -) ↑ in entropy (ΔS = +) b) ΔH = 5000 J ΔS = 192 J/K T = 298 K ΔG = 5000 - (192)(298) = -52216 J Spontaneous (ΔG = -) Endothermic (ΔH = +) ↑ in entropy (ΔS = +) c) ΔH = 19400 J ΔS = -145 J/K T = 225 K ΔG = 19400 - (-145)(225) = 52025 J Nonspontaneous (ΔG = +) Endothermic (ΔH = +) ↓ in entropy (ΔS = -) The worksheet covers fundamental concepts of thermodynamics, including Gibbs Free Energy, enthalpy, entropy, and their relationship to the spontaneity of reactions. It also includes exercises to apply these concepts to specific examples. Potential Energy Diagram 1. Does this graph show an exothermic or endothermic reaction? How do you know? Exo - products lower than reactants 2. Label the following letters: A. Reactants B. Products C. Activation Energy D. Activated Complex / Transition State 3. If a catalyst was added, what letter on the graph would change? How would it change? C - it would be lowered 4. How does this apply to the collision theory? Reactants (A) collide and when they collide in the correct orientation they make an activated complex (D). If there is1 a catalyst, it lowers the activation energy (C) which makes it easier for reactants to collide and make an activated complex.