Physical Science Chapter 20

11 Questions
Chapters Of Physical Science Quizzes & Trivia

Welcome to the twentieth chapter of our ongoing study of science, with specific reference to the topic of physics, which is comprised of motion, matter, force, energy and behaviour through space and time. Let’s take a look.

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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