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Chemical bonds (ionic, covalent, hydrogen)

Biology • Atoms, Water & Chemical Bonds • Knowledge-Based • 5 questions

Chemical bonds (ionic, covalent, hydrogen) Knowledge-Based Download PDF

Biology · Chemistry of Life · Biology · Atoms, Water & Chemical Bonds

5 Biology practice questions on Chemical bonds (ionic, covalent, hydrogen). Questions that assess core concepts and understanding.

Questions

  1. 1.

    Which of the following statements correctly describes a nonpolar covalent bond?

    • A) It occurs when electrons are transferred from one atom to another, resulting in electrostatic attraction between oppositely charged ions.
    • B) It occurs when electrons are shared unequally between atoms with different electronegativities, resulting in partial electric charges.
    • C) It occurs when two atoms share electrons equally because they possess identical or very similar electronegativities.
    • D) It occurs when an electrostatic attraction develops between a partially positive hydrogen atom and an electronegative atom with a partial negative charge.
  2. 2.

    Within the aqueous environment of a living cell, which of the following statements best explains why covalent bonds are generally stronger and more stable than ionic bonds?

    • A) Covalent bonds require the complete transfer of valence electrons, making them resistant to interactions with polar solvent molecules.
    • B) Water molecules form hydration shells around charged ions, shielding electrostatic attractions while leaving shared electron pairs intact.
    • C) Ionic bonds rely entirely on temporary induced dipoles, which instantly collapse when exposed to polar solvent molecules.
    • D) Water molecules form permanent covalent links with dissolved ions, actively destroying the lattice without affecting covalent molecules.
  3. 3.

    Which of the following characterizes a polar covalent bond formed between two atoms?

    • A) The complete transfer of one or more valence electrons from one atom to another
    • B) The electrostatic attraction between a partially positive hydrogen atom and an unshared pair of electrons on an adjacent molecule
    • C) The equal sharing of valence electrons between atoms with identical electronegativities
    • D) The unequal sharing of valence electrons caused by a difference in electronegativity between the bonded atoms
  4. 4.

    Which of the following processes directly leads to the formation of an ionic bond between two neutral atoms?

    • A) The transfer of one or more valence electrons from one atom to another, creating oppositely charged ions that attract electrostatically.
    • B) The equal sharing of a pair of valence electrons between two atoms with nearly identical electronegativities.
    • C) The weak attraction between a partially positive hydrogen atom and a strongly electronegative atom of an adjacent molecule.
    • D) The unequal sharing of valence electrons that generates persistent partial charges within a single polar molecule.
  5. 5.

    Which of the following statements correctly distinguishes a hydrogen bond from a covalent bond?

    • A) Hydrogen bonds involve the direct transfer of electrons between oppositely charged ions, whereas covalent bonds involve electron sharing.
    • B) Covalent bonds form solely between polar molecules due to partial charges, whereas hydrogen bonds occur exclusively between nonpolar atoms.
    • C) A hydrogen bond is an electrostatic attraction involving a partially positive hydrogen atom, whereas a covalent bond involves the sharing of electron pairs between atoms.
    • D) Hydrogen bonds are strong intramolecular bonds that form within a molecule, whereas covalent bonds are transient intermolecular interactions between separate molecules.