Chemistry 9-5-18 Homework Conversion Factor & Density Problems

CHEMISTRY: Here is our discussion from today of some of the conversion factor problems from the homework. Are you getting an answer, or are you showing proper work that shows that you understand the process? Are you practicing them the correct way? You want to get great at working these yourself, not just get great at watching me work them!

What about the test coming up – have you started preparing? Be sure and check out the Test Info tab here on the website!


flickr photo by Enokson

Chemistry (and Honors) 9-4-18 Using Density

CHEMISTRY – Hey guys, here’s a pic of some “high density” koi that I saw in Hawaii (at the Dole Pineapple Plantation, of all places!). Great review on density problems today, and more! Remember, in chemistry we use math as a tool, therefore we might work problems a little differently in chemistry than you do in your math class.

When working these problems, don’t forget to follow the problem solving steps we discussed today:

  • Analyze – write down what you’re given and what you’re looking for
  • Plan – write a formula where you isolate the unknown on one side by itself
  • Compute – plug in your data, numbers and units; then cancel the units, and if they cancel correctly, go on to the calculator. Be sure and give your answer what the correct units.
  • Evaluate – does your answer make sense, have you used the correct units, do you have the correct sig figs?

Need more practice? Help session TOMORROW morning, 7:30ish A.M.

Physics 9-1-18 Acceleration, Pt. 2

PHYSICS: Watch out for bunnies on ski slopes!! Here’s the last of the acceleration formulas. Good job with the derivations! You’re doing really well with them – stay with it! Carefully examine what you know with the formulas you have that might fit. And if they don’t, examine what you do know that could lead you to what you need to know. You know? πŸ™‚

Tonight’s problems may be a little challenging, but you can do it!! Do you need some extra practice rearranging the formulas, or just working the problems? Help session?

Physics 9-8-16 Acceleration, Pt. 2 from Tammy Skinner on Vimeo.

flickr photo by DaPuglet

Physics 8-31-18 Acceleration

PHYSICS: Thanks Gigi and Joseph for the awesome illustration of constant acceleration! πŸ˜‰

Also – love how you began deriving formulas! I think you’ll come to find these are a ton better than some of the velocity problems you did. List what you are given and what you’re looking for – don’t forget things like “starts from rest” and “came to a stop.” Easy peazy! Okay, maybe not that easy! πŸ˜‰


flickr photo by Marxpix

Hon Chemistry 8-31-18 Another Look at Problem Solving

HON CHEMISTRY – Great job on the homework problems! Remember, in chemistry we use math as a tool, therefore we might work problems a little differently in chemistry than you do in your math class.

If you are converting, even if it’s not an “official SI conversion”, you MUST show your work using the Q Formula. When working other problems, don’t forget to follow these problem solving steps:

  • Analyze – write down what you’re given and what you’re looking for
  • Plan – write a formula where you isolate the unknown on one side by itself
  • Compute – plug in your data, numbers and units; then cancel the units, and if they cancel correctly, go on to the calculator. Be sure and give your answer what the correct units.
  • Evaluate – does your answer make sense, have you used the correct units, do you have the correct sig figs?

Have a great extra long weekend!!


Photo by Ian Espinosa on Unsplash

Physics 8-30-18 Tortoise & the Hare and Intro to Acceleration

PHYSICS: Great work on the tortoise and the hare problem! And great intro to acceleration!

How are you doing on the “tough” problems? I’ve said it before, but remember a few things: You weren’t born knowing how to do these – give yourself a little time. On the really good ones, just one formula won’t work – begin with writing what your know. These are some of the hardest problems we’ll work in physics – not because the formulas are hard, but because knowing how to reason through them is so challenging.

You are doing a great job! Some good advice – go work them again! I promise, it will be good for you. Remember, don’t open the solutions you wrote in your notes! Try them without it!! If you have to, peek, but then don’t stop until you can work the entire problem through without looking!


flickr photo by Marxpix

Hon Chemistry 8-30-18 Conversion Factors, Pt. 2

HON CHEMISTRY: Great job with our start on using conversion factors to work more advanced conversions! It’s good to able to convert from one unit to another, but can you use that info to solve a real world problem?

Remember, this isn’t just about getting an answer – some of you can do that in your head. This is about being able to convert from one unit to another using the Q-formula. (And yes, you have to do it that way!). Now go forth and conquer!


flickr photo by A. Jarrett

Chemistry 8-30-18 Conversion Factors

CHEMISTRY: Great job with our start on using conversion factors to work problems! Hopefully this was a review from your earlier academic life. We’ll crank it up a notch tomorrow!! πŸ˜‰

Remember, this isn’t just about getting an answer – some of you can do that in your head. This is about being able to convert from one unit to another using the Q-formula. (And yes, you have to do it that way!)

Make sure you practice using your notes tonight, it’ll help you remember the steps we followed today in class!

If you need more practice on these or other problems, what about a HELP SESSION?


flickr photo by vnysia