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Physical Science Chapter 20

11 Questions
Physical Science Quizzes & Trivia

Sciecen. Yes.

Questions and Answers
  • 1. 
    The low energy orbital of the pair of molecular orbitals (MOs) formed when two atomic orbitals combine. 
  • 2. 
    The point in a chemical reaction in which the forward and reverse reactions are equal. 
  • 3. 
    The point in a reaction that separates reactants from products on a potential energy surface. 
  • 4. 
    The high energy orbital of the pair of MOs formed when two atomic orbitals combine. 
  • 5. 
    The energy that must be put into a system before a reaction can take place. 
  • 6. 
    The probability waves (orbitals) that describe the possible location for an electron in a molecule are exactly the same as those for an electron in an isolated atom. 
    • A. 

      True

    • B. 

      False

  • 7. 
    Electrons in a bonding molecular orbital are most likely to be found between the nuclei in a molecule. 
    • A. 

      True

    • B. 

      False

  • 8. 
    A reaction usually goes faster at higher temperatures. 
    • A. 

      True

    • B. 

      False

  • 9. 
    A catalyst is a chemical that is present at the beginning of a reaction but not at the end. 
    • A. 

      True

    • B. 

      False

  • 10. 
    A very fast reaction has high activation energy. 
    • A. 

      True

    • B. 

      False

  • 11. 
    Atomic Chlorine (Cl) is known to be a catalyst for some of the reactions that are responsible for the depletion of Ozone (O3) in the upper atmosphere (also known as the ozone hole). As a catalyst, Cl may...
    • A. 

      Be lowering the activation energy of some reaction involving ozone

    • B. 

      Be consumed in the reaction

    • C. 

      For a transition state with O3 in which O3 bonds get weakened

    • D. 

      A and c

    • E. 

      A, b, and c