Water / Water Chemistry

The Liquid Nitrogen Cloud

Have you ever seen the liquid nitrogen cloud? Do you wonder how the cloud forms when hot water is thrown onto liquid nitrogen? This post explores the liquid nitrogen cloud and possible explanations for its formation.

Earth Day 2014

Earth Day is just around the corner. If you are looking for some ideas to highlight environmental issues, the Journal of Chemical Education is offering free access to many articles and activities that you will find interesting.

Water Filtration

In this Activity, students make a water filtration column using a 2-liter plastic beverage bottle that contains layers of gravel, sand, and activated charcoal. They prepare a contaminated sample of water and examine the filtration ability of the column. This environmental chemistry Activity can be used to complement a celebration of Earth Day.

The Nature of Hydrogen Bonding

In this Activity, students build models of polarized water molecules using K’nex toy components and adhesive Velcro. Students investigate hydrogen bonding by shaking the models in various ways. They observe the resulting interactions and relate their observations to physical states of water and the difference between strong bonds and weak attractions.