# Hon Chemistry 10-31-17 Mass to Moles to Molecules

HON CHEMISTRY: So what do you think is the mass of a mole of skittles? Awesome job today using a chemical formula as a tool!

It turns out there are tons of ways that you can use a chemical formula! Like finding molar mass, moles, and maybe how many skittles are in a mole of skittles? Let’s practice it tomorrow!

P. S. Did you realize how super important it’s going to be for you to be able to correctly write chemical formulas (and memorize all that formula stuff)?!?

# Physics 10-31-17 Friction & Normal Force

PHYSICS: Why don’t things that are moving just keep moving? Here is our intro on friction from today.

Remember a few key things. One of the most important – net forces produce acceleration.

You can find Ff a couple of different ways – it’ll be part of a net force equation and can be found from the coefficient of friction equation. If and ONLY if your object is moving at a constant velocity, Ff will equal Fa. Fn is only sometimes equal to Fw. If your object is pulled at any angle (or pushed), Fn will be a part of Fnet in the vertical direction.

Whew! π

# Hon Chemistry 10-27-17 Moles, Molar Mass & Avogadro’s Number

HON CHEMISTRY: So….you think if his work helped us understand something as significant as the number of something in a mole they might name something after him? They did! Go figure! Another name for the number of anything in a mole is Avogadro’s Number. That would be how many?

You caught on super fast today! Remember, it’s all in terms of one mole. The mass of one mole, the molar mass, is the average atomic mass of the element in grams (periodic table). And the number of atoms in one mole is …. well you know that. Speaking of moles, isn’t he cute? Well, beauty being in the eye of the beholder and all. Hmmmm………

# Physics 10-25-17 Newton’s 2nd & 3rd Laws

PHYSICS: 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. Here’s the lecture from today on just that! Now remind me, net forces produce what?

Oh, and while we’re at it, you’d rather hit a hay stack than a brick wall why?

(Thanks, Arlie and Nathan – and all, for being great volunteers!)

# Hon Chemistry 10-25-17 Oxidation Numbers & Help Session

HON CHEMISTRY: So how are the chemical formulas and chemical names coming? With oxidation numbers, you now have a few guidelines to help polish up what you already know!

And don’t forget to add one more thing to your “make sure you memorize for the test” list: polyatomic ions, chemical names and formulas for common substances, binary acids, oxyacids, prefixes, and from today oxidation rules. Oxidation rules! We’ve really already been using oxidation numbers, you just didn’t know it! π

But does it all matter? These complicated rules about naming compounds, I mean. Let’s find out tomorrow in lab!

# Physics 10-24-17 A Woodpecker, a Gorilla & ZORBA

PHYSICS: Here’s our walk through the woodpecker, gorilla, and Zorba problems today. Question – you did a great job watching me work through the problems, what about you? Were you brainstorming, applying information you’ve previously learned?!?

Now you try it! Can you go and do the Zorba problem on your own?

# Physics 10-23-17 Hanging Signs

PHYSICS: Great work today thinking the “Wanda has a sign” and the “street light blow askew” problems! How you look at problems from the beginning can make a huge difference – huh?

A couple of things that work for me when doing equilibrium, etc., problems – first, draw them. Then go back through and separate resultants into components. If an object is in equilibrium, then there are no net forces – all the forces in the x direction balance – everything left equals everything right, and all the forces up equal all the forces down.

You’ve got all the ammo you need, now go forth and conquer!

Answers for the Equilibrants II worksheet are below:

1. Fn = 3430 N upward against feet
2. Fn1 = Fn2 = 1890 N upward on each foot
3. F forward = 4.59 N
4. T1 = T2 = 1760 N
5. T1 = 1360 N and T2 = 680. N

flickr photo by loop_oh

# Chemistry 10-23-17 Chapter 1 Test Overview

CHEMISTRY – Are you ready? God bless you as you study! Here’s the overview of the test that we did in class today. Speaking of videos – have you watched the video clips on Cu, P, and Si? You can find them at www.periodicvideos.com.

Make sure you aren’t just reading your book and notes. First, memorize the facts, then go back and make sure you can apply the concepts. Study examples, make your own examples, practice making questions. And don’t forget, if you are getting lost with everything you need to know, or if you’re not sure how to study, Chapter 1 Stuff to Know Sheet under the Test Info tab

Also, don’t forget the great review games that are in the Student Premium section of the online textbook. You can do this – I believe in you! I’m praying for you!!

# Hon Chemistry 10-23-17 Binary Molecular Formulas & Chemical Formulas Review

HON CHEMISTRY: So is it a little clearer now? Did today’s homework review help? Here it is, just in case you need to save it for the future. π

# Physics 10-20-17 Forces & Equilibrium

PHYSICS: So, how is the balance in your life? Here’s the lesson from Friday on net force, equilibrium, and equilibrants. Were you experiencing a little dΓ©jΓ  vu?

Great job today! Thank you, all of you, for being such good sports!!!

Image source phoenix.fanster.com/…/2009/08/tug-o-war1.jpg