Daily Archives: February 14, 2022

Chemistry 2-14-22 Making Gases Pre-Lab & Another Look at Chemical Equations

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CHEMISTRY: Happy Monday. Here’s our quick look at the Balancing Equations Worksheet 3 and then our discussion of the positive tests for carbon dioxide, oxygen, and hydrogen gases for the experiment: Making and Testing for Gases. If you were absent on Monday, be sure and watch this vodcast – it’s required before you can do the lab.

Because of the super short class scheduled for Friday, we’ll move this lab to next Tuesday. Be sure and watch for it on the syllabus. Remember that your pre-lab quiz for this lab is to show me the three balanced equations you’ll need for the experiment and the positive test you expect to see for each gas. I think you’ll have lots of fun with this one. 🙂


Photo by Yaoqi on Unsplash

Physics 2-14-22 Escape Velocity & Chapter 7 Test Overview

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PHYSICS: …… and to continue, escape velocity. And that’s it!! Here’s our look back at the chapter.


Photo by SpaceX on Unsplash

Hon Chemistry 2-14-22 Isotopes & Average Atomic Mass

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HON CHEMISTRY: Here’s the full lesson for Monday – even the part we didn’t quite get to! Isn’t God awesome to give us minds to understand the world around us – even the parts we can’t see!

Today we talk about isotopes and calculating average atomic mass. Make sure you practice all the ways to write nuclear symbols. Also make sure you can use them to determine the number of protons, neutrons, electrons, etc., AND be sure you can use the formula to find average atomic mass!

Here are some answers for tonight’s homework:

#19) 39.95 u
#20) 10.00 u
#34) 9 x 10^12 more dense

Can you believe atoms are that small – and the nucleus even waaaaaay smaller! The thumbnail is a picture of atoms from the IBM Almaden Research Center. These are iron atoms on top of copper. Being able to move atoms around like this was a giant leap in the field of nanotechnology! (Sorry about that, bad pun! 🙂 )


Image source IBM Almaden Research Center