Label one cup Water and the other Alcohol. Pour water and isopropyl alcohol into their labeled cups until each is about ½ full. Show students the two liquids and point out that they look very similar.

The unknown in this lesson is salt water. Remind students to wash their hands after completing the activity. Isopropyl alcohol should be disposed of according to local regulations. All other common ...

Isopropyl is pure alcohol with no other ingredients. Rubbing alcohol is a mixture of isopropyl and water, sometimes containing additional ingredients. Unlike rubbing alcohol, undiluted isopropyl ...