Physics 10-25-13 Forces & Equilibrium

PHYSICS: So, how is the balance in your life? Here’s the lecture from Friday on net force, equilibrium, and equilibrants. Were you experiencing a little déjà vu? Tonight’s homework is Pg. 143 – 146: 7 – 12 AND the Equilibrant Forces worksheet.

Short lesson, but good job today! Thank you, Will and Van, for being such good sports!!!

PHYSICS10-25-13 Forces & Equilibrium from Tammy Skinner on Vimeo.

Image source…/2009/08/tug-o-war1.jpg

Hon Chemistry 10-25-13 Empirical & Molecular Formulas

HON CHEMISTRY: Awesome job today!! You just about figured out how to find an empirical formula all by yourself! I love the way you were able to think through what you knew and what you needed to find a solution!

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.

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!

HON CHEMISTRY 10-25-13 Empirical & Molecular Formulas from Tammy Skinner on Vimeo.

flickr photo by Elizabeth The Queen Of All Things