Chemistry Unit 2 Test Review

Front

What is the Lewis dot structure for the molecule fluorine (F2)?

Back

The correct Lewis dot structure for F2 shows two fluorine atoms, each with three lone pairs and one bond between them.

Front

What charge does a calcium (Ca) ion have?

Back

A calcium ion has a charge of +2.

Front

What is the correct Lewis structure for ammonia (NH3)?

Back

The correct Lewis structure for NH3 shows a nitrogen atom bonded to three hydrogen atoms with one lone pair on nitrogen.

Front

How many bonds can an atom with four valence electrons make?

Back

An atom with four valence electrons can make 4 bonds.

Front

What is the name of the compound P4S5?

Back

The name of the compound P4S5 is tetraphosphorus pentasulfide.

Front

Define a covalent bond.

Back

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form bonds in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.

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 between atoms.

Front

What is a molecular formula?

Back

A molecular formula shows the number and types of atoms in a molecule, indicating the actual number of each atom present.

Front

What is the significance of valence electrons in bonding?

Back

Valence electrons are the outermost electrons of an atom and are involved in forming bonds with other atoms.