Endothermic Vs. Exothermic

1. Endothermic Vs. Exothermic Amber Lucas Period B2

2. Energy States Endothermic takes in energy as a reaction occurs, whereas an exothermic reaction gives off energy during a reaction. (As shown in the pictures to the right.)

3. Endothermic As an endothermic reaction takes in energy it will give off a cold feeling, after the reaction has taken place. If you dissolve ammonium nitrate in water it will give off the cold feeling (the essence of commercial cold packs) Such as the reaction Mr. Listorti did in class when the beaker of water stuck to the block of wood, because the drop of water froze under the beaker.

4. Exothermic As an exothermic reaction gives off energy, it will give off heat, after the reaction has taken place. As the temperature of the reaction increases the molecules move slower. An example could be lighting a match, lighting a piece of paper on fire and let it burn, or a camp fire. All give off heat, but different amounts.

5. Conclusion Endothermic is and energy state when it absorbs heat and gives off a cold feeling and molecules move at a faster rate. Exothermic is the energy state when it gives off heat and molecules move at a slower rate.

6. Work Cited http://en.wikipedia.org/wiki/Exothermic http://www.citycollegiate.com/chapter2a.htm http://en.wikipedia.org/wiki/Endothermic http://chemistry.about.com/cs/generalchemistry/a/aa051903a.htm