When chemicals burn, it is really a chemical reaction between the substance and the oxygen in the air. When substances do not get enough oxygen, they don’t burn completely. Below is a video of 30 ml of flour exposed to a flame. Only a small fraction of the flour burns, while […]
Archive for November, 2006
Video Demo: Colorful Water Electrolysis
Published by November 9th, 2006 in Demos and Video. 2 CommentsIn my class students learn about chemical reactions and also the difference between elements and compounds. Students learn that the 5 signs of a chemical reaction are: 1) color change 2) gas production 3) precipitation 4) temperature change 5) change in properties (smell, texture, taste, density, etc.)
Students also learn that compounds are […]
This is a lesson that I got from another teacher, who I think got it from Science Gems. My eighth graders have to learn what chemical reactions are and how to recognize them. Our textbook describes 5 types of evidence that a chemical occurred. They are color change, temperature change, gas production, precipitation and change […]
