The video tutorial explains how to write the chemical formula for phosphorus pentafluoride (PF5). It begins by identifying phosphorus and fluorine as nonmetals, indicating a covalent compound. The tutorial then details the process of writing the formula by using element symbols and applying prefixes to determine the number of atoms. The video concludes with tips for memorizing prefixes and a summary of the formula.

What type of elements are phosphorus and fluorine?

• Noble gases

• Metalloids

• Metals

• Non-metals

What type of compound is formed when two non-metals combine?

• Ionic compound

• Metallic compound

• Alloy

• Molecular compound

What is the element symbol for phosphorus?

• Ph

• P

• Po

• Ps

How many fluorine atoms are in phosphorus pentafluoride?

• Three

• Seven

• One

• Five

What does the prefix 'penta' indicate in chemical nomenclature?

• Three

• Five

• Four

• Two

What is the correct formula for phosphorus pentafluoride?

• PF3

• PF6

• PF4

• PF5

Why is the number '1' not written as a subscript for phosphorus in PF5?

• It's a mistake

• It's not needed for non-metals

• It's only used for metals

• It's assumed by convention

What might help in memorizing chemical prefixes?

• A chemistry textbook

• A molecular model

• A prefix table

• A periodic table