Chemistry A Unit 4 Practice Test

Front

What does each row on the periodic table represent?

Back

An energy level.

Front

What type of bond exists between carbon and oxygen in CH₂O?

Back

A double bond.

Front

According to the octet rule, how many valence electrons do most elements need?

Back

8.

Front

How would you classify the bond between lithium and oxygen?

Back

Ionic.

Front

What is the electron geometry of TeBr₄?

Back

Trigonal bipyramidal.

Front

Define the octet rule.

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full set of eight valence electrons.

Front

What is a Lewis structure?

Back

A Lewis structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist.

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 the significance of valence electrons in chemical bonding?

Back

Valence electrons determine how an atom can bond with other atoms and are crucial for understanding reactivity.

Front

What is the shape of a molecule with a tetrahedral electron geometry?

Back

The shape of a molecule with a tetrahedral electron geometry is also tetrahedral.