Informative Speech Outline

Informative Speech Outline

Topic: Science behind Mentos and Coke trick

Specific Purpose: To inform the audience what happens when a Mentos is dropped in coke.

I. Introduction

A. Attention Getter: who knows what happens when we drop Mentos in a 2l diet coke? Now, who knows why that happens?

B. Thesis: well, today I am here to tell you what actually happens, the science behind this act.

C. Preview of Main points: today I will tell you a brief history about when it started and what goes between the coke and Mentos causing it to erupt abnormally.

II. Body:

So, it began when NPR’s David Kestenbaum and Micehle Norris did in April, 2006. After that website called eepybird.com did a series of videos on June of 2006 using just mentos and coke, which then put this stunt to a household stunt. You can watch some of their videos on their website eppybird.com or search for eepybird on YouTube.

Now as to what really happens? According to newscientist.com, this is a physical reaction rather than any chemical reaction. When you put a Mentos into diet coke, it disrupts the surface tension with which they are held together and acts as a growth site for bubbles. And Mentos is a rough candy which has a high ratio of surface area to volume which makes room for more places for the bubbles to go. Each Mentos candy has thousands of tiny pits all over the surface. These tiny pits are called nucleation sites - perfect places for carbon dioxide bubbles to form. As soon as the Mentos hit the soda, bubbles form all over the surface of the candy, and hence the fountain effect. Low surface tension also helps bubbles grow quickly. Study of the measurements showed that the surface tension in water containing the sweetener aspartame is lower than in sugary water, explaining why Diet Coke creates more dramatic fountains than sugary Coke. Again you can find all these information on www.newscientists.com

III. Conclusion

So lets see what I told you guys today. I told you what really...