Lesson Worksheet: Covalent Bonding Chemistry

In this worksheet, we will practice describing covalent bonding in terms of the electrostatic attraction between atomic nuclei and pairs of shared electrons.

Q1:

How many electrons are shared in a triple bond between two nitrogen atoms?

Q2:

How many electrons are shared in a double bond between two oxygen atoms?

Q3:

How many electrons are shared in a single bond between two hydrogen atoms?

Q4:

Which of the following pairs of atoms are most likely to form a covalent bond?

  • ATwo metal atoms
  • BTwo nonmetal atoms
  • CA metal atom and a nonmetal atom

Q5:

Which of the following pairs of elements is likely to bond covalently?

  • AMg and Cl
  • BFe and H
  • CS and Ne
  • DBa and K
  • EP and F

Q6:

The word “covalent” can be broken into two parts: “co” and “valent.” The “co” part means “together.” To what does the “valent” part refer?

  • AOuter electrons
  • BAtoms
  • CProtons
  • DNuclei
  • EInner electrons

Q7:

Halogen atoms form diatomic molecules with single covalent bonds. Shown in the graph are the atomic radii of three halogen elements and the bond energies of their diatomic molecules.

What is the main reason for the variation in bond energy between Cl2 and I2?

  • ABonds become weaker when the separation of nuclei and bonding electrons increases, because the electrostatic attraction between them decreases.
  • BBonds become stronger when the separation of nuclei and bonding electrons increases, because the electrostatic repulsion between them decreases.
  • CBonds become stronger because the separation of bonding electrons increases, reducing the electrostatic repulsion between them.
  • DBonds become weaker when the separation of nuclei increases, because the electrostatic attraction between them decreases.
  • EBonds become stronger because the separation of nuclei increases, reducing the electrostatic repulsion between them.

Q8:

Iodine monochloride (ICl) is a diatomic molecule with a single polar covalent bond. Electrons are more strongly attracted to the chlorine atom. This polarity may be represented by labeling the structural formula with an arrow, as shown.

ICl

In which of the following structural formulas is the covalent bond polarity not correctly labeled?

  • A
    HCl
  • B
    ClF
  • C
    BrI
  • D
    HF
  • E
    BrCl

Q9:

Which of the following substances contains polar covalent bonds?

  • AH2
  • BHO2
  • CNaO2
  • DO2
  • ENaH

Q10:

Which of the following substances contains both covalent and ionic bonds?

  • ACO2
  • BHCO23
  • CBaCO3
  • DBaO
  • EHO2

This lesson includes 36 additional questions and 8 additional question variations for subscribers.

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