Chemical Thermodynamics

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1. Which of these is not a feature of spontaneous reaction?

  • During Spontaneous process - the total energy increases
  • When spontaneous reaction proceeds - energy is released
  • An e.g osmosis, expansion of compressed gas
  • The reversion of the sponstaneous process is unreal
  • Spontaneous reaction proceeds until equilibrium is reached
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2. What is a catabolic pathway in terms of Gibbs energy?

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

3. Which of these statements is not related to entropy

  • Entropy increases until equilibrium is reached in an isolated system
  • At equlibrium entropy always decreases in an isolated sytsem
  • 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
  • Inequality of Clausius - (when energy changes form- some part is lost as entropy)
  • S= Kb ln W
  • Entropy never decreases in an isolated system

4. Which of these does change in Gibbs energy NOT depend on?

  • Temperature and pressure
  • The useful work
  • Change in entropy and enthalpy
  • Concentration of reactants and products
  • On their chemical constitutions

5. What is the difference between Macrostate and microstate of a system?

  • Macrostate is defined by parameters (eg.pressure, temp, number of phases) and microstate is defined by thermodynamics (the position and velocity of the particles and distribution of energy between them)
  • Macrostate is defined by thermodynamics (the position and velocity of the particles and distribution of energy between them) and microstate is defined by parameters (eg.pressure, temp, number of phases)

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