Chemical Thermodynamics

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

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

3. If Q

  • Change in Gibbs < 0 And the reaction will go from right to left
  • Change in Gibbs > 0 And the reaction will go from right to left
  • Change in Gibbs < 0 And the reaction will go from left to right (spontaneous)
  • Change in Gibbs > 0 And the reaction will go from left to right (spontaneous)

4. Which of these is NOT a thermodynamic law?

  • It is impossible to convert heat completely into different forms of energy (2nd Law)
  • Energy can never be created nor destroyed (3rd Law)
  • The total energy of an isolated system remains the same (1st Law)

5. Change in G > 0 means ...

  • The reaction is exergonic (reaction is spontaneous and useful work is obtained)
  • The reaction is in equilibrium (no work obtained)
  • The reaction is endergonic (requires energy from surrounding to proceed)
  • The reaction is exergonic (requires energy from surrounding to proceed)

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