Physics Quiz: Conservation of Energy, Isotopes, and Covalent Bonds
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Questions and Answers

Which scientist proposed the Law of Conservation of Energy?

  • Hermann von Helmholtz (correct)
  • Frederick Soddy
  • Dmitri Mendeleev
  • Marie Curie

    • What is the significance of isotopes in chemistry?

  • They provide a tool for understanding atomic mass.
  • They have the same number of protons but different numbers of electrons.
  • They help in determining the age of ancient artifacts. (correct)
  • They exhibit identical chemical properties.

    • How is atomic mass calculated?

  • By summing the results of multiplying each isotope's mass by its abundance. (correct)
  • By dividing the mass of an isotope by its abundance.
  • By adding the number of protons and neutrons.
  • By multiplying the number of protons by the number of neutrons.

    • What did Frederick Soddy propose in 1913?

    <p>The concept of isotopes</p> Signup and view all the answers

    Why are valence electrons important in chemistry?

    <p>They are involved in chemical bonding and reactions.</p> Signup and view all the answers

    In what year did Dmitri Mendeleev devise the first periodic table?

    <p>1869</p> Signup and view all the answers

    What is electronegativity?

    <p>A measure of an atom's ability to attract and hold onto electrons in a chemical bond</p> Signup and view all the answers

    Who proposed the concept of electronegativity?

    <p>Linus Pauling in 1932</p> Signup and view all the answers

    What is the main difference between an ionic bond and a covalent bond?

    <p>Ionic bonds involve sharing electrons, while covalent bonds involve transferring electrons</p> Signup and view all the answers

    What is the Lewis dot structure used for?

    <p>To represent the valence electrons in an atom or molecule</p> Signup and view all the answers

    Who developed the concept of the Lewis dot structure?

    <p>Gilbert N. Lewis in the early 20th century</p> Signup and view all the answers

    What is activation energy in a chemical reaction?

    <p>The minimum energy required for a reaction to occur</p> Signup and view all the answers

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