7C Exam Review

Front

What is a covalent bond?

Back

A covalent bond is a type of chemical bond where two atoms share one or more pairs of electrons.

Front

Which compound is NOT formed by a covalent bond?

Back

K2S (Potassium Sulfide) is formed by ionic bonds, not covalent bonds.

Front

What is the Lewis Dot Structure for ammonia (NH3)?

Back

The Lewis Dot Structure for NH3 shows nitrogen in the center with three hydrogen atoms bonded to it, and a lone pair of electrons on nitrogen.

Front

What is the molecular structure of carbon dioxide (CO2)?

Back

The molecular structure of CO2 is linear, with the carbon atom in the center and two oxygen atoms on either side.

Front

What is the correct Lewis Structure for the bond between magnesium (Mg) and chlorine (Cl)?

Back

The correct Lewis Structure shows Mg donating two electrons to two Cl atoms, forming MgCl2.

Front

What is the significance of lone pairs in Lewis Structures?

Back

Lone pairs represent non-bonding electrons that can affect the shape and reactivity of molecules.

Front

How do you determine if a Lewis Structure is drawn correctly?

Back

A correct Lewis Structure must satisfy the octet rule for main group elements and show all valence electrons.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form bonds until they are surrounded by eight valence electrons.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons.

Front

What is a molecular geometry?

Back

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule.