Chemical Thermodynamics

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1. Which of these is NOT an expression for Change in Gibbs energy?

  • ΔG = ΔU + QW
  • ΔG=∑ΔG(f-products)−∑ΔG(f-reactants)
  • ΔG=ΔG0+RTlnQ
  • ΔG=ΔH−TΔS
  • ΔG=−nFE (Faraday's constant for redox reactions)
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2. What is a catabolic pathway in terms of Gibbs energy?

  • Change in Gibbs < 0 exergonic pathways eg degradation of nutrients to obtain available energy
  • Change in Gibbs > 0 endogonic pathways eg degradation of nutrients to obtain available energy
  • Change in Gibbs < 0 exergonic pathways eg biosynthesis
  • Change in Gibbs > 0 endogonic pathways eg biosynthesis

3. Which of these statements is not related to entropy

  • Entropy increases until equilibrium is reached in an isolated system
  • Entropy never decreases in an isolated system
  • An Isolated system spontaneously passes to the most probable state (a macroscopic state with the highest no. of microscopic state)
  • Change in S> change in H / T
  • At equlibrium entropy always decreases in an isolated sytsem
  • S= Kb ln W
  • Inequality of Clausius - (when energy changes form- some part is lost as entropy)

4. Why does in liquids the Change in U approximately equals to Change in H when volume pressure work occcurs?

  • Because energy in solids is negligible
  • Because pressure in solids is negligible
  • Because pressure in liquids is negligible
  • Because energy in liquids is negligible

5. Which of the equations is Boltzmann constant used for?

  • For absolute value of Energy
  • For absolute value of Entropy
  • For absolute value of Enthalpy

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