Phosphorus Triiodide Concepts

The video tutorial explains how to write the chemical formula for phosphorus triiodide. It begins by introducing the compound and its name, highlighting the presence of two 'i's in a row. The tutorial then discusses the nature of molecular compounds and the use of the periodic table to identify elements. It explains that phosphorus is represented by 'P' and iodide by 'I', with the prefix 'tri' indicating three iodine atoms. The final formula is given as PI3, and the video concludes with a summary and thanks from Dr. B.

What are the components of phosphorus triiodide?

• Phosphorus and iodine

• Phosphorus and oxygen

• Sulfur and oxygen

• Iodine and sulfur

Why is the prefix 'tri' used in phosphorus triiodide?

• Because it is a salt

• Because it is a metal compound

• Because it contains three iodine atoms

• Because it contains three phosphorus atoms

What is the chemical symbol for phosphorus?

• Pt

• P

• Ph

• Po

What is the chemical symbol for iodine?

• I

• Id

• Io

• In

How many iodine atoms are in phosphorus triiodide?

• Three

• Two

• Four

• One

What is the correct chemical formula for phosphorus triiodide?

• P3I

• PI3

• PI2

• PI