Chemical reactions occur all around us every single day, and some reactions even occur within us! This week, we take a closer look at chemical reactions. Learn about a chemical reaction that makes old pennies shine, a reaction to form a precipitate, and how to make both an endothermic and exothermic reaction.
Online Videos: Use these links to educate and entertain!
- Early Elementary: Physical and Chemical Changes
- Upper Elementary: Chemical Changes Fast and Slow
- Middle School: Chemical Change Making Oxygen Gas
- High School: Chemical and Physical Change Demonstrations
Cleaning Pennies – One sign of a chemical change is a change in color. In this experiment, you’ll see a change in some everyday items. This experiment shows how chemistry exists everywhere and lets students try chemistry at home.
Cloudy with a Chance of Precipitate – Precipitates form in aqueous (in water) solutions when positively and negatively charged molecules, called ions, crystallize and form solids. These solids are insoluble in water: they do not dissolve well. In this activity, two soluble ionic compounds—sodium carbonate and magnesium sulfate—are combined in water. While the separate solutions appear clear, the combination of both results in a solid precipitate.
Cool Reactions, Hot Reactions – How do you know when a chemical reaction is taking place? One way is to look for a temperature change and there are two great examples in your kitchen and the laundry!
For additional resources, check out our STEM @ Home page!