Covalent Bonds

Multiple Choice

Which of the following statements best describes a covalent bond?

• It involves the sharing of electron pairs between two atoms.

• It occurs when metals bond to each other.

• It results from the transfer of electrons from one atom to another.

• It only occurs in ionic compounds.

Open Ended

Explain how the difference in electronegativity between two atoms determines the type of bond formed.

Multiple Choice

Which type of bond is characterized by a difference in electronegativities between 1.7 and 3.3?

• Nonpolar covalent

• Polar covalent

• Ionic

• Metallic

Multiple Select

Which of the following statements are true about non-polar covalent bonds?

• Electrons are shared equally between atoms.

• The negative charge is distributed evenly.

• Examples include hexane and oil.

• Poles of positive and negative charges form at each atom.

Fill in the Blanks

Polar covalent bonds

share electrons equally between the two atoms involved.

Fill in the Blanks

A chemical compound whose simplest units are molecules is called a

compound.

Open Ended

List all the diatomic molecules that exist in nature as mentioned in the lesson.

Multiple Choice

What happens to the potential energy of atoms as they come close enough to form a covalent bond?

• It increases to its highest value

• It stays the same

• It is at its lowest

• It fluctuates randomly

Multiple Select

Which of the following statements about covalent bonds is correct?

• Bond length is the distance at maximum potential energy between two atoms.

• Bond energy is the energy released when a bond forms.

• Atoms release energy as they change from individual atoms to a molecule.

• Bond length is the distance between two bonded atoms at their minimum potential energy.

Open Ended

Explain the octet rule and its significance in chemical bonding.

Fill in the Blanks

Hydrogen can only bond to one other atom because it wants

valence electrons.

Open Ended

What is the purpose of electron dot notation and how is it used to represent elements?

Fill in the Blanks

Electron dot notation can also be used to represent

, showing how atoms are bonded.

Multiple Choice

What are unshared pairs of electrons called in a Lewis structure?

• Lone pairs

• Bonding pairs

• Valence electrons

• Core electrons

Multiple Choice

Which steps are involved in writing a Lewis structure according to the slides?

• Add valence electrons, arrange atoms, add unshared pairs, count electrons

• Arrange atoms, add unshared pairs, count electrons, add valence electrons

• Add unshared pairs, add valence electrons, arrange atoms, count electrons

• Count electrons, arrange atoms, add valence electrons, add unshared pairs

Fill in the Blanks

A covalent bond produced by sharing two pairs of electrons is called a

bond.

Multiple Choice

Which of the following statements about multiple bonds is correct?

• Double and triple bonds have higher bond energies than single bonds.

• Single bonds have higher bond energies than double bonds.

• Triple bonds have longer bond lengths than single bonds.

• Double bonds are weaker than single bonds.

Open Ended

Why can only central atoms have expanded valence, and what condition must be met for this to occur?

Multiple Choice

What is a key characteristic of covalent bonds?

• They result from the sharing of electron pairs between two atoms.

• They occur when metals bond to nonmetals.

• They involve the transfer of electrons from one atom to another.

• They only occur in ionic compounds.