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Chapter 6: Chemical Reactions

chemical reactions

Fatima Salazar

on 21 April 2010

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Transcript of Chapter 6: Chemical Reactions

Chapter 6: Chemical Reactions Chemical Reactions change substances chemical reactions occur when substances undergo chemical changes to form new substances. Production of gas and change of color are signs of chemical reactions a chemical change happens almost every time there is a change in color. Chemical reactions rearrange atoms The product and reactants contain the same types of atoms: Carbon, Hydrogen, and Oxygen. Energy and Reactions
A small spark provides enough energy to start an isooctane-reaction. Isooctane can be found in gasoline. Energy must be added to make bonds Many forms of energy can be used to break bonds. Forming bonds release energy when new bonds form, energy is released. Energy is conserved in chemical reactions. The total energy before a reaction is total to the energy of the products and their surroundings. Reactions that release energy are exothermic. Reactions that absorb energy are endothermic.
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