Practice with Names
Prefix Names for Covalent Compounds
Lets look at how to name the compounds we just worked with (from exercise 15).
Now, name the compounds for which you determined the formulas (in exercise 15-e) using the prefix method. The correct answers follow.
The prefix name for SiH4 is silicon tetrahydride. Its common name is silane. The prefix name for PH3 is phosphorus trihydride. Its common name is phosphine. The proper prefix name for H2S dihydrogen sulfide. Since this is the simplest, most common, most expected and most reasonable of the sulfur-hydrogen compounds it is quite often simply called hydrogen sulfide. The lack of prefixes in this name leaves it to you (and your understanding of bonding and electron structure) to figure out that there are two hydrogens and one sulfur. HBr is called hydrogen bromide.
E-mail instructor: Eden Francis
Clackamas Community College