Hydrogen: Chemical Element Facts
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Questions and Answers

What is the most abundant chemical substance in the universe?

  • Oxygen
  • Hydrogen (correct)
  • Helium
  • Carbon

    • At standard conditions, hydrogen is a gas of diatomic molecules with the formula?

  • H4
  • H2 (correct)
  • H3
  • H

    • In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first?

  • Day after the Big Bang
  • Minute after the Big Bang
  • Second after the Big Bang (correct)
  • Hour after the Big Bang

    • Which type of bond does hydrogen readily form with most nonmetallic elements?

    <p>Single covalent bond (A)</p> Signup and view all the answers

    What role does hydrogen play in acid–base reactions?

    <p>Donates protons (C)</p> Signup and view all the answers

    What is the enthalpy of combustion for hydrogen gas?

    <p>286 kJ/mol (A)</p> Signup and view all the answers

    At what temperature does hydrogen autoignite in air?

    <p>500 °C (C)</p> Signup and view all the answers

    What types of mixtures form explosive combinations with hydrogen gas?

    <p>Air and chlorine (A)</p> Signup and view all the answers

    What type of flames do pure hydrogen-oxygen flames emit?

    <p>Ultraviolet light (C)</p> Signup and view all the answers

    What is the key role of hydrogen in the development of quantum mechanics?

    <p>It is the only neutral atom for which the Schrödinger equation can be solved analytically (A)</p> Signup and view all the answers

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