Thermodynamics and Kinetics Quiz
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Questions and Answers

Which type of system allows for the exchange of both mass and energy with its surroundings?

  • Closed system
  • Open system (correct)
  • Thermal system
  • Isolated system

    • What does the First Law of Thermodynamics state regarding energy?

  • Energy can only be converted from one form to another. (correct)
  • Energy can be created and destroyed.
  • Energy is constant and cannot change form.
  • Energy loss is inevitable in any process.

    • In an endothermic process, what happens to heat?

  • Heat is released to the surroundings.
  • Heat remains unchanged.
  • Heat is absorbed from the surroundings. (correct)
  • Heat equilibrium between system and surroundings is established.

    • According to Hess's Law, what must be done when reversing a reaction?

    <p>The sign of ΔH changes but not its magnitude.</p> Signup and view all the answers

    Which of the following describes entropy in a system?

    <p>A measure of the randomness or disorder of the system.</p> Signup and view all the answers

    What is the formula for calculating the change in enthalpy for a reaction?

    <p>ΔH = H(products) – H(reactants)</p> Signup and view all the answers

    How is work classified when it is done on the system?

    <p>Positive work</p> Signup and view all the answers

    Which statement about an isolated system is true?

    <p>It does not exchange either mass or energy.</p> Signup and view all the answers

    What is the relationship between Gibbs Free Energy and spontaneity of a reaction when ΔG is negative?

    <p>The reaction is spontaneous at all temperatures.</p> Signup and view all the answers

    In a collision theory context, which of the following is a requirement for effective collisions to produce a chemical reaction?

    <p>Molecules must collide with sufficient energy and correct orientation.</p> Signup and view all the answers

    What does the rate law equation rate = k[A]^x[B]^y signify?

    <p>It relates the reaction rate to the concentrations of reactants.</p> Signup and view all the answers

    What characterizes an irreversible process?

    <p>It cannot be undone by exactly reversing the change.</p> Signup and view all the answers

    What occurs at the transition state of a reaction?

    <p>Atoms are in an unstable arrangement at the peak of the activation-energy barrier.</p> Signup and view all the answers

    In the formula ΔG = ΔH - TΔS, what does a positive value for ΔS imply?

    <p>The system has increased randomness.</p> Signup and view all the answers

    Which statement about activation energy is true?

    <p>It is the energy barrier that must be crossed for reactants to become products.</p> Signup and view all the answers

    If a system loses 354 J of heat and does 94 J of work, what is the correct formula to find the change in internal energy?

    <p>ΔU = -354 J + 94 J</p> Signup and view all the answers

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