16 October Science 8 Chemical Reactions–Steel wool reactions–conservation of mass–properties of gases–crystal observations–matter observation and theory chart

  1. Mindful moment.
  2. Review previous DSN entry.
  3. Preview today’s blogpost.
  4. Create today’s DSN entry in the Matter folder.
  5. Questions.
  • * * * *

See the video on Brownian motion captured by Aadi and Sumair: https://drive.google.com/file/d/1HJYssXeGZsQ3GL4pjRneAh3ZlHMlP4mL/view?usp=sharing

Why is Brownian motion such important evidence in support of the idea that matter is composed of particles (atoms and molecules) that have certain properties and behaviors?

In his 1905 article: “Investigations on the theory of the Brownian Movement,” Einstein used other areas of science (like Newton’s Laws of Motion and associated concepts) to describe, explain and predict phenomena involving Brownian motion.



  • “What Einstein showed was that the diffusion of an object undergoing Brownian motion will diffuse at a particular rate (known as the mean squared displacement), and that this rate depended upon the number of atoms or molecules in a mole of the fluid in which the object is suspended (Avogadro’s number). From this one could determine the size of molecules or atoms. For the first time, a measurable quantity allowed us to probe the atomic realm. It wasn’t just the idea, but rather the precision of Einstein’s results that many scientists found so convincing.
  • Einstein’s work settled a dispute that had raged for nearly a century, and it placed kinetic theory on an experimental foundation. From this work, Newtonian physics, chemistry, and thermodynamics were connected.”

Do not open your steel wool experiment bottles. Observe them. What do you notice about the appearance of the bottles and the contents? How might you explain what has happened?

Find the mass of the two bottles with the steel wool experiments. Add your data to the spreadsheets.

Enter your data: https://docs.google.com/spreadsheets/d/1rrd1tHdwl83TcklHU6S69Y0vZFU4qgvQ5qrY-VYF2ng/edit?usp=sharing

1718 Class spreadsheet: https://docs.google.com/a/aes.ac.in/spreadsheets/d/14FwGAKLDQq807T-ntdtD4Rp2dzveqX8HuAk3eunY2ws/edit?usp=sharing

Enter your data: https://docs.google.com/spreadsheets/d/1tgEamXHYw64OTPBVGCRu3U9CtvMZCk5lz0oIpvgRqgQ/edit?usp=sharing

1718 Class spreadsheet: https://docs.google.com/a/aes.ac.in/spreadsheets/d/1_UM-F_4LSQtvW3e4PaJiFknqv0wamDnNJbtHj6x2e3c/edit?usp=sharing

Now we will test the gases in the two bottles. Ask questions if you do not understand any part of the procedures or the results.

  • Extracting the gas.
  • Flaming splint.
  • Glowing splint.
  • Density with respect to air.
  • Amount of gas produced or consumed?

View your crystals. Take photos and make sketches. Why is the phenomenon of crystalline substances having characteristic regular forms evidence for the Atomic Theory of Matter?

Work on your matter chart.

Send 1 sketch, 1 photo, 1 reflection from 3 different days to the editors of the current parent newsletter. This is required. Comply if you are asked for an interview.

A scene from the train for WOW8. We will be examining the carbon cycle starting in January. When you look out the train window on the trip to Haridwar, you will see some crops dominating the landscape. There are poplar trees (whose botanical origin is North America) and sugar cane from Asia-Pacific. These plants make important molecules that humans use intensively: cellulose and sucrose. What for–do you think? How do the plants do this–do you think? What are the myriad pathways by which a tree makes cellulose and a giant grass makes sucrose? Science encourages you to see a world full of action, movement, and change at all scales. Science encourages a mindful view of things.

About rfrazier

AES profile = http://aes.ac.in/viewprofile.php?u=6946
This entry was posted in Science 8. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *