Concept12 - Concept 2.4 Chemical reactions make and break...

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Concept 2.4 Chemical reactions make and break chemical bonds In  chemical reactions,  chemical bonds are broken and reformed, leading to new  arrangements of atoms. The starting molecules in the process are called  reactants,  and the final molecules  are called  products. In a chemical reaction, all of the atoms in the reactants must be present in the  products. The reactions must be “balanced”. Matter is conserved in a chemical reaction. Chemical reactions rearrange matter; they do not create or destroy matter. For example, we can recombine the covalent bonds of H 2  and O 2  to form the new  bonds of H 2 O. In this reaction, two molecules of H 2  combine with one molecule of O 2  to form two  molecules of H 2 O. Photosynthesis is an important chemical reaction. Humans and other animals ultimately depend on photosynthesis for food and  oxygen.
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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