SBEC Chemistry and Physics » empirical formula

Chemistry 3-2-09 Molecular Formulas

Ms. Skinner — Tue, 03 Mar 2009 02:19:28 +0000

CHEMISTRY: You did it! Here’s the last lecture from chapter 7 – molecular formulas. If you can do empirical formulas, then this is a piece of cake! It’s just a couple of steps tacked on to the end of those problems. Practice, practice practice!!

Chemistry 2-27-09 Empirical Formulas

Ms. Skinner — Sat, 28 Feb 2009 02:15:22 +0000

CHEMISTRY: Hallelujah for Fridays! You did a really good job today on emipirical formuals. Make sure you practice them before Monday so you won’t forget everything. Also, don’t forget lab reports due Monday. Make sure your observations are complete. Include everything you measured and all of your calculations. Have a great weekend – I can’t believe February is already over!

Hon Chemistry 2-19-09 Molecular Formulas

Ms. Skinner — Fri, 20 Feb 2009 02:09:01 +0000

HON CHEMISTRY: Hey guys, here’s the lecture from Thursday. We reviewed empirical formulas and then did molecular formulas. You’re doing a great job on these!

Hon Chemistry 2-18-09 Empirical Formulas

Ms. Skinner — Thu, 19 Feb 2009 01:44:32 +0000

HON CHEMISTRY: Great start on empirical formulas today. 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. There’s a little added step you might have to add to the end – I mentioned it at the end of class today, we’ll go over it again tomorrow. Also tomorrow – molecular formulas.