Remember, a dead fish can float downstream, but it takes a live one to swim upstream.
Why do some things float and some things sink?
The simplest answer is density. Things that are more dense than water will sink and things that are less dense will float.
It’s phenomenal! Aspartame found in diet soda is less dense than sugar found in regular soda. The density of diet soda is around 0.97 g/mL and the density of full sugar soda is around 1.02 g/mL. If you have a bucket of water, floating a can of diet soda in the same water that regular soda sinks is a great phenomenon to introduce density.
There isn’t a student alive who doesn’t love the density column experiment. You find 3 or 4 or 5 or 6 liquids of different densities and pour them into a graduated cylinder, one at a time, densest liquid first. If you’re smart, you’ll be sure the liquids have different colors to make the effect more dramatic.
I’ve been successful using these liquids:
pancake syrup (density = 1.37 g/mL)
antifreeze (density = 1.11 g/mL)
salt water (density = 1.03 g/mL, add food coloring for more fun)
canola oil (density = 0.92 g/mL)
isopropyl alcohol (density = 0.786 g/mL)
I suppose you could substitute tap water for the salt water, but that’s less fun. The cool thing about this is that the densities of the layers are different enough that they won’t mix. Of course, each layer is a different color which is even cooler.
A more challenging density column includes liquids that will mix next to each other such as isopropyl and water. A little food dye in one or both of the layers will show them mixing at the surface.
I wrote a density workbook for a fifth grade class including the density column lab and lots of worksheets to practice D=M/V. I think it could be used for older students also.
We know that you don’t want them to miss any school. We know it’s hard to find child care for sick children.
And that’s why we want you to keep them home. Please.
If they have a fever that you’re hiding with Tylenol “just so they can make it through the day,” then they need to stay home. If they come to school and ask to see the nurse before 8 am, they should have stayed home.
If you send your sick kid to school, 23 other students in his class are now going to catch his cold. And so will I.
So for the next 3 weeks, I’ll be dealing with my own cold (don’t get me started on how hard it is to make meaningful sub plans) and dealing with 23 students who should be staying home but aren’t, all in various stages of a cold. All with a cold of my own.
In some circles, saying this is forbidden. Somehow, teachers aren’t supposed to think about their own health and welfare, just the educational needs of their students and the day care needs of their students’ parents.
But hear this. Teacher welfare IS important to your children’s educational needs. If I’m out sick for 2 days, that’s a lot of busy work your child is doing instead of actually learning something. That’s 2 days less of extra help learning to read or do long division or balance chemical equations.
I’ll start the unit with an explanation of the difference between mass and weight. I created a worksheet that explains how to calculate your weight on other planets which is kind of fun.
One of the trickiest things to teach in mass is measuring mass of different things. It’s easy to find the mass of a solid object but much harder to find the mass of a liquid or powder so I wrote labs to practice these skills.
Volume can be calculated if the object is a regular rectangular prism or other geometric figure, so I threw in a page of practicing length x width x height. And measuring volume of liquids is pretty easy for students to learn, but it’s much harder to use the displacement method to measure the volume of irregular solids. I included a worksheet for each of those skills. Finally, I wrote a lab measuring volume of liquids, regular solids, and irregular solids.
My name is Jayzee I have been teaching science for more than 30 years. I spent a few years teaching 6th grade earth science, a few years teaching 10th grade biology, another few years teaching 11th grade chemistry, a dozen or so years teaching 7th grade life science and 8th grade physical/chemical science, and a few years teaching 12th grade electives including anatomy and physiology, weather, astronomy, and earth science. Most of this was in 1 district although I have moved once or twice to climb the salary ladder.
What am I doing here?
Because teaching is very isolating if you let it be. There are days when talking to nothing but teenagers changes the way you think. When I start to think that posting videos on TikTok is a great idea or that the new SnapChat filter is cool, I know it’s time to reach out to my amazing coworkers for some adult time.
Every good idea, in teaching and otherwise, is better when it’s shared. If I have a great idea for the classroom and I use it with my 90 students, the world is a better place for those 90 students. But if I share it with 10 other teachers? Well, you can do the math.
I absolutely love what I do, and I wouldn’t quit even if I won the lottery.
This has been my mantra for the 30+ years I’ve been in the classroom, and I hope it remains my mantra until I retire.
And it’s true. I love engaging the kids, crafting new lessons, watching the lightbulbs brighten.
So please let me know I’m not just writing thing into a void! (Although, to be honest, talking to oneself is still better than not talking.) I’d love a comment or an email at JustAddH2OTeacher@gmail.com.