Chemistry 1-15-21 Polymers & Empirical & Molecular Formulas HW

CHEMISTRY: We finally finished the chapter! Did you realize molecules could be that large? And so many of them. But don’t you think polymers are cool? The first vodcast below is the rest of the lecture that you need for polymers. Fast forward to the part where we left off in your class. Some items for contemplation: why are certain plastics recyclable and others not…and what about dishwasher and microwave safe? Hmmmmm…

Below that is what we actually did first in class yesterday – our look at the homework from last night – empirical and molecular formulas. Great stuff to review as you study for the test!

Polymer Lecture – Fast forward to the part that you need:

Image source: http://www.packtech.ca/pb/images/img32161428fffbe41e07.jpg

Empirical and Molecular Formulas HW:

Photo by ThisisEngineering RAEng on Unsplash

Physics 1-15-21 Chapter 6 Review & Help Session

PHYSICS: Here’s our short review of from today of some of the momentum concepts and problems from ch 6: #10 from the worksheet – the rollercoaster, and #47 from the textbook – the billiard balls. Below that is the help session from this morning – more about bouncing.

God bless you as you study for your test. I’ll be praying for you!


Photo by Robert Zunikoff on Unsplash

Help Session from Tuesday morning:

Photo by Web Donut

Chemistry 1-14-21 Empirical Formulas & Molecular Formulas

CHEMISTRY: Hey guys! Awesome job with empirical formulas, and now you’ve conquered writing molecular formulas! Here’s the lecture from Thursday. Don’t you think that molecular formulas are just like writing empirical formulas but with a twist at the end?

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 – then the twist at the end if it’s a molecular formula

Have you started preparing for the test? It will be over ALL of chapter – plus the small bit from chapter 3. Be sure and checked out the Stuff to Know sheet for all of chapter 7 under the Test Info tab!


flickr photo by Sebastian Mary

Hon Chemistry 1-13-21 Double Replacement & Combustion Reactions

HON CHEMISTRY: You realize what we did? We finished all 17 types of reactions today!

Are you working on memorizing all 17 types of reactions?! But don’t just memorize them. Make sure you can apply them as well. When you start to work any equation, first determine what type of reaction it is, then figure out what rule applies and follow it to determine the products. I believe in you! You can do it!! (and yes, I realize I am repeating myself, but I do and you can!)

Physics 1-13-21 Collisions Problems Review 2

PHYSICS: Great job with some of the more advanced momentum and energy problems! Here’s a look at the student in the middle of a frozen pond, bird on the wire, and car crash with coefficient of friction.

Ready for the test? Take another look at some of the concepts!


Photo by Jenny Salita on Unsplash

Physics 1-12-21 Collisions Problems with Energy & Bouncing

PHYSICS: Great job on the problems so far!! Here’s our look how kinetic and potential energy get involved – dart in the block of wood and the bird on the swing. This cute little bird isn’t on a swing, but he is one I came beak to nose with on a mission trip to Costa Rica!

What about even more practical applications? Hmmmm…..

Chemistry 1-12-21 Percent Composition

CHEMISTRY: Great job today! Way to apply chemistry to your everyday life!!

I think you’ll find that percent composition problems are super easy to catch on to. First, though, be sure you know which “type” of percent composition you’re trying to fine. Also make sure you can write chemical formulas (I won’t give them to you!) and that you’ve memorized the formulas for acids and those chemical names and formulas for common substances. It’s just plug and play from there! 🙂


flickr photo by Τϊζζ¥

Hon Chemistry 1-12-21 Single Replacement Reactions & the Activity Series

HON CHEMISTRY: Moving right along with the 17 types of chemical reactions, here are the single replacement reactions – and you also got a head start on the activity series!

This makes 15 reactions so far, and we’ll do the rest tomorrow. Careful though, memorize, but don’t just memorize them. Make sure you can apply them as well. When you start to work any equation, first determine what type of reaction it is, then figure out what rule applies and follow it to determine the products. I believe in you! You can do it!!


flickr photo by bobtravis

Physics 1-11-21 Collisions

PHYSICS: Collisions – they’re all around us and they all obey the law of conservation of momentum. Here’s more specific information about the proper way to differentiate and name them.

Great job with the conceptual review and setting up the problems! As you practice tonight, be sure and check for connections between the conservation of momentum and the conservation of energy. 🙂


flickr photo by chavil brasil