Did you figure out how to create a multi-colored mixture? Check out the solution to Chemical Mystery #19: Multi-colored Mixture!
Liquid nitrogen is used to visualize the aerosol particles emitted while speaking, coughing, breathing, and sneezing. The ability of various masks to block these droplets was also tested.
When describing abstract concepts like chemical bonding, it always seems to feel far too easy for both teachers and students to resort to the “wants” and “needs” of atoms. After all, we understand what it means to want, need, or like something, so it often feels appropriate (and easier) to use a relatable metaphor or subtly anthropomorphize these atoms to accommodate our students’ current reasoning abilities. While predicting the types of bonds that will form and the general idea behind how atoms bond can be answered correctly using such relatable phrases or ideas, the elephant in the room still in remains—do our students really understand why these atoms bond?
A light sphere covered with foil can be attracted to or repelled from charged rods.
The electrostatic attraction of a liquid is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
The electrostatic attraction of distilled water is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
The electrostatic attraction of ethanol is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
The electrostatic attraction of acetone is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
The electrostatic attraction of dichloromethane is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
The electrostatic attraction of tetrachloromethane is observed by bringing a charged bakelite rod and a charged glass rod near to a thin stream of the liquid flowing from a buret.
