Chemistry 10-31-19 Coding a Human “Robot” & HW Update

CHEMISTRY: So what’s more important than knowing something? Being able to use it? Being able to effectively communicate it to somebody else? Did you begin to feel the important of that today?!?

Here are some homework updates/clarifications:

  • Common Subst. Research – Due date changed to Tuesday
  • LAB: Energy of Solutions due tomorrow (Friday), 8:00 A.M. – Save as PDF to your Google Drive & Turnitin
  • Sciencegeek.com practice for Friday HW – Do Practice 1 only. Due Tuesday

Physics 10-31-19 Friction & Forces at an Angle

PHYSICS: So what happens to your applied for when you pull or push something at an angle?

Again, 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! πŸ™‚


flickr photo by kbaird

Physics 10-29-19 Newton’s 2nd & 3rd and Friction

PHYSICS: Why don’t things that are moving just keep moving? Here is our intro on friction from today. First though, a look at Newton’s 3rd law and 2nd law.

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! πŸ™‚


flickr photo by kbaird

Hon Chemistry 10-29-19 Moles, 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………


Image source blog.ibts.eu/wp-content/uploads/2009/02/mole2.jpg

Hon Chemistry 10-28-19 Oxidation Numbers

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! πŸ™‚


flickr photo by scottwillis

Hon Chemistry 10-25-19 Binary Molecular Formulas

HON CHEMISTRY: Okay, I’m not saying that learning to name and write chemical formulas is as bad as a jellyfish sting (you’ll get that in a minute!), but you do have to really, really pay attention to the details!! Here’s our discussion on writing formulas and names for binary molecular compounds. Part of it’s really similar to what you learned to do for ionic compounds, don’t you think? The other part is totally different, though!

Make sure you keep everything straight. Find a way to organize all the information for yourself so you won’t get confused. Also, don’t forget the lists you have to memorize – chemical names for common substances, polyatomic ions, acids, and numerical prefixes. And practice, practice, practice!!!


Image source casch52

Chemistry Chapter 1 Pre-Test

CHEMISTRY: Here’s the Chapter 1 Pre-Test. Fill in your answers below. When you are finished, be sure and click Submit and check to see which ones you missed.Check the syllabus for the due date. Let’s see what you know! πŸ™‚

P.S. Click here for a link if that will work better for you!
Chemistry Chapter 1 Pre-Test

Chemistry 10-24-19 Another Look at Energy

CHEMISTRY – Happy Day!! You just took the last notes from the chapter, now it’s time to go apply what you know!!

Great review today! So can energy be destroyed? Good job on tracing the energy transformations from one form to another. Applications, applications! Make sure you can apply what you learned today – on the test (and in life!). Did I mention that already?

Hey, have you had a chance to check out the chapter 1 study suggestion sheet?


Photo by Rodolfo Marques on Unsplash

Physics 10-22-19 And Did the Hammock Crash?

PHYSICS: Great work today thinking through this one and also the “Wanda has a sign” 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 Nomadic Lass