2025 Unit 7 Exam Review

Draw an electron dot structure of the oxygen molecule. Use the structure to show how many shared pairs of electrons are present in a diatomic molecule of O₂.

• 1

• 2

• 3

• 4

How many single covalent bonds can carbon form?

• 1

• 2

• 3

• 4

A compound formed from the sharing of electrons is called a what?

• formula unit

• molecule

• crystal

• ion

How many valence electrons does the ion PO₄⁻³ have? (Hint: draw the Lewis Structure)

• 8

• 13

• 23

• 32

Which property is generally associated with nonpolar covalent compounds? (Choose all that apply.)

• extreme hardness

• low boiling point

• brilliant luster (luster means shiny)

• high melting point

Sodium and flourine will form what type of bond?

• ionic

• covalent

• metallic

• polyatomic

What type of bond will form between N and O atoms?

• ionic

• covalent

• metallic

• polyatomic

A pure copper wire, which is the bond between copper atoms is a classic example of what type of bond?

• ionic

• covalent

• metallic

• polyatomic

Which is the correct name for the molecule P₂O₅?

• triphosphorus dioxide

• dioxygen phosphate

• diphosphorus pentoxide

• phosphorus (II) oxygen

Which is the correct name for the compound PCl₅?

• monophosphorus tetrachloride

• phosphorus pentachloride

• pentaphosphorus chloride

• phosphorus chloride