Chemistry 11-16-22 Binary Molecular Formulas

CHEMISTRY: Do you feel like you have letter and numbers swimming in your eyes? This is one of those times that paying attention to details is super, super important! Here’s the lecture from Thursday on writing formulas and names for binary molecular compounds. Part of it’s really similar to what you learned to do for ionic compounds, but another part is totally different. Details!!

Make sure you keep everything straight. Do something that will organize all the information for you, so you won’t get confused. Also, don’t forget the lists you have to memorize – it’s getting larger and larger!! And practice, practice, practice!!!

Need extra practice? Help session Thursday morning, 7:30 AM


flickr photo by Roger Smith

Physics 11-15-22 Work & Energy

PHYSICS: Funny thing about words, all this work you thought you’d been doing, was it work after all?

Great job today on making connections between work and energy! I think you’ll like using the work-energy theorem, it’ll save you some time and a couple of steps. Don’t forget about friction!

Physics 11-17-16 Work & Energy from Tammy Skinner on Vimeo.

flickr photo by *hb19

Hon Chemistry 11-15-22 Empirical & Molecular Formulas

HON CHEMISTRY: Now that you know how to write chemical formulas, you are going to be amazed at what you can do with them! I love the way you are able to think through what you know and what you need to find a solution. Today you are going to use that to find empirical formulas and molecular formulas all by yourself – well, almost by yourself. 🙂

Be sure and practice – if you don’t it’ll get all turned around and you’ll end up leaving off an important step. The hardest part is that it’s not a set formula for you to plug and play, but if you’ll keep in mind that you’re really just looking for subscripts which are just moles, you’ll be able to think it through. Percent to mass, mass to moles, moles to smallest whole number ratio.

Are you starting to catch on to the steps? It will be good for you to memorize them, but would it not be just tons better to understand why you need each step – backwards and forwards, so then you wouldn’t need to memorize them at all!

And then, also remember what molecular formulas are – just a multiple of the empirical formula. Keep that concept in mind, and you’ll have no problem remembering to divide the molecular formula mass by the empirical formula mass to find X! Easy peasy! 🙂


flickr photo by Darwin Bell