Chemical Compounds and Prefixes

The video tutorial explains how to write the chemical formula for phosphorus pentachloride (PCl5). It begins by identifying phosphorus and chlorine as nonmetals, classifying the compound as molecular. The tutorial then details writing the element symbols and determining subscripts based on prefixes, specifically highlighting the prefix 'penta' for five chlorines. The final formula, PCl5, is presented, along with tips for memorizing prefixes.

What type of elements are phosphorus and chlorine?

• Metals

• Nonmetals

• Noble gases

• Metalloids

What kind of compound is phosphorus pentachloride?

• Ionic compound

• Molecular compound

• Metallic compound

• Alloy

What is the element symbol for phosphorus?

• Ph

• P

• Ps

• Po

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

• Four

• Three

• Five

• Two

How many chlorine atoms are in phosphorus pentachloride?

• One

• Seven

• Three

• Five

What is the correct formula for phosphorus pentachloride?

• PCl4

• PCl5

• PCl6

• PCl3

Which of the following is a useful tool for memorizing chemical prefixes?

• Prefix table

• Periodic table

• Element list

• Molecular chart

Who is the presenter of the video tutorial?

• Dr. D

• Dr. A

• Dr. C

• Dr. B