How to Write Molecular Compounds

Next Video:
The Molecular Formula for an Alkane Molecule....5

Writing molecular compounds will require you to make sure that you're using the right prefixes. Find out how to write molecular compounds with help from an experienced chemistry and science professional in this free video clip.

Part of the Video Series: Chemistry Help
Promoted By Zergnet


Video Transcript

Hi, I'm Robin Higgins. And this is how to write molecular compounds. Alright, so to write molecular compounds, we're going to need our handy-dandy prefix list, I've written that up here. And so, let's just start in with an example. Let's look at this guy. So, the first thing we need to do, is we're going to find how many numbers we have in each element. So, our first one's sulfur, we have one, for oxygen, we have two. So, a rule is that if we have our element and it only has one, we eliminate the prefix, we just don't use it. So, this would be mono sulfur, if we using the prefix, but we're not going to, so it's just sulfur. And now, we need to use two, so that's Di and we have oxygen. And another rule is that our last element ends in the letters, IDE or Ide. So, instead of oxygen, we're going to say oxide. So, this name is sulfur dioxide. Let's look at one more example. So, everyone;s favorite, H-two-O (H2O) or water. But let's give its formal name. So, our first element is hydrogen and we have two, so Di, hydrogen, that's easy. And now, we have one oxygen and remember we only eliminate the mono prefix if it's first. This is second, so were going to use it. So, we have mono. And once again, we're going to end oxygen in IDE, so we're going to say oxide. This already has an O right here, so we're just going to say, monoxide. So, the formal name if water is dihydrogen monoxide. Let's look at one more example. So, if we have this guy, we can name it carbon with no mono, since it's first. Now, you have to look for four, tetra and the CL stands for chlorine, but again we're going to end in Ide, so chloride. And that's it. I'm Robin Higgins, and this has been how to name molecular compounds.


Related Searches

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!