1 / 9

Elephants’ Toothpaste

Elephants’ Toothpaste. A tower of foam emerges from a graduated cylinder. Purpose. To observe the rapid decomposition of hydrogen peroxide when treated with a catalyst . Demonstration. bubble. The hydrogen peroxide had a few drops of detergent in it

yeardley
Download Presentation

Elephants’ Toothpaste

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Elephants’ Toothpaste A tower of foam emerges from a graduated cylinder

  2. Purpose • To observe the rapid decomposition of hydrogen peroxide when treated with a catalyst

  3. Demonstration bubble • The hydrogen peroxide had a few drops of detergent in it • When potassium iodide KI was added it catalyzed the decomposition of the hydrogen peroxide • The oxygen gas bubbled causing the detergent to foam bubble bubble 2H2O2 + O2 2H2O

  4. Concepts 1. Decomposition Reactions 2. Peroxides 3. Gases

  5. 1. Decomposition Reactions • Any reaction of the general form • AB A + B • In a decomposition reaction a single substance breaks into two or more substances • We say the original substance has “decomposed” which means it has broken apart

  6. H O O H 2. Peroxides • A compound which has an oxygen-oxygen bond • Hydrogen peroxide is a common peroxide • Chemical formula H2O2 • Chemical structure

  7. 3. Gases • Occupy much greater volume than the solid or liquid substances from which they are formed • Expand to fill or escape the container they are in • Will foam in the presence of a detergent as in this demonstration

  8. Conclusions • Hydrogen peroxide decomposed to form oxygen gas and water when treated with a catalyst • When trapped in detergent, the oxygen gas bubbles expanded and a foaming tower was produced

  9. Comments • Many different peroxides are known to exist • Benzoyl peroxide is a peroxide used in acne medication which released oxygen to kill facial bacteria

More Related