Daily Archives: October 29, 2014

Hon Chemistry 10-29-14 Molecular Formulas

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HON CHEMISTRY: I was really impressed today with the progress you’ve made on mastering percent composition and empirical formulas! Now it’s time to move on to molecular formulas!

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!

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!

Need some extra practice? Help Session next Tuesday morning, 7:15ish A.M.

HON CHEMISTRY 10-29-14 Molecular Formulas from Tammy Skinner on Vimeo.

flickr photo by Darwin Bell

Physics 10-29-14 Newton’s 2nd & 3rd Laws

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PHYSICS: Wow! What a crazy few days!! Here is the lesson on Newton’s 2nd & 3rd laws. You will need to watch this one to get the rest of the notes on these laws. The beginning has a bit of review, so fast forward if you want to where we left off in class today.

And, for your viewing pleasure, enlightenment and overall edification – Julius Sumner Miller on Newton’s Second and Third Laws. Good stuff! you’ll find them extremely helpful with the conceptual part of the test. I strongly encourage you to watch them!

So an object at rest can be at equilibrium, but what about an object that is moving? And how does equilibrium relate to Newton’s first law? Or Newton’s second law? And what if you don’t have balanced forces. Now remind me, net forces produce what?

PHYSICS 10-30-13 Newton’s 2nd & 3rd Laws from Tammy Skinner on Vimeo.

Photo: Joe Armao