Chemistry Test Chemical Bonding 3

Question 1

What is the hybridization of the carbon atom in ethylene (C₂H₄)?

Accepted Answer

sp²

Answer

Carbon in ethylene is sp² hybridized because it forms three sigma bonds and one pi bond via an unhybridized p orbital.

Question 2

Which statement correctly describes a pi (π) bond?

Accepted Answer

It forms by lateral overlap of p orbitals and prevents free rotation

Answer

Pi bonds form through lateral overlap of parallel p orbitals, creating electron density above and below the internuclear axis and restricting rotation.

Question 3

What does bond dissociation energy represent?

Accepted Answer

The energy required to break one mole of a bond in the gas phase

Answer

Bond dissociation energy is the energy needed to homolytically break one mole of a specific bond in gaseous molecules.

Question 4

In which compound are the bonds best described as metallic?

Accepted Answer

Cu

Answer

Copper (Cu) is a pure metal where atoms release valence electrons into a delocalized 'sea,' forming metallic bonds.

Question 5

How many lone pairs are on the nitrogen atom in ammonia (NH₃)?

Accepted Answer

1

Answer

Nitrogen in NH₃ has 5 valence electrons; 3 are used for bonding, leaving 1 lone pair.

Chemistry Practice Test

Chemistry Practice Test

Chemistry Test Chemical Bonding 3