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Chapter 6, Lesson 7 Multimedia

Thermite Reaction

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  • Iron oxide, aluminum, and a catalyst are placed in a flower pot.
  • The reaction is extremely exothermic resulting in molten iron and aluminum dripping into sand below the flower pot. The demonstration shown in this video is very dangerous. Do not attempt to perform this demonstration.

Nitrogen Triiodide Reaction

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The nitrogen triiodide is so unstable that the slightest touch will cause it to decompose in an exothermic reaction. The demonstration shown in this video is very dangerous. Do not attempt to perform this demonstration.

White Phosphorous Reaction

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  • White phosphorous dissolved in a solvent is dripped onto a piece of paper.
  • When the solvent evaporates, the phosphorous combines with oxygen in an exothermic reaction. The demonstration shown in this video is very dangerous. Do not attempt to perform this demonstration.

Methane Combustion Energy

The combustion of methane is an example of an exothermic reaction. More energy is released when the bonds in the products are formed than is used to break the bonds of the reactants. This is shown by larger energy arrows coming out of the products and smaller energy arrows going into the reactants.

Baking Soda and Calcium Chloride Reaction

The chemical equation for the reaction between baking soda and calcium chloride. Calcium chloride and sodium bicarbonate react to yield calcium carbonate, sodium chloride, water, and carbon dioxide.
  • In this reaction, the temperature goes up so it is exothermic.
  • In an exothermic reaction, more energy is released when bonds in the products are formed than is used to break the bonds in the reactants.

Baking Soda and Vinegar Reaction

  • In this reaction, the temperature goes down so it is endothermic.
  • In an endothermic reaction, more energy goes into breaking the bonds of the reactants than is released when the bonds in the products are formed.

Endothermic Reaction

  • Energy is used to break the bonds of the reactants.
  • Energy is released when the bonds of the products are formed.
  • Since more energy is absorbed when the bonds are broken than is released when new bonds are formed, the reaction is endothermic and the temperature goes down.

Exothermic Reaction

  • Energy is used to break the bonds of the reactants.
  • Energy is released when the bonds of the products are formed.
  • Since more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants, the reaction is exothermic and the temperature goes up.