scotty 11 - Chemistry 13 Notes 13.1 Background Chemists...

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Chemistry 13 Notes 13.1 – Background Chemists must always consider reaction rates when synthesizing compounds. o No matter how stable a compound might be, its synthesis is impossible if the rate at which it forms is too slow. Ludwig Wilhelmy measured how fast sucros, upon acid treatment, hydrolyzed into glucose and fructose in 1850. o The reaction occurred over several hours and showed how the rate depended on the initial amount of sugar present-the greater the initial amount, the faster the initial rate. Today we can measure the rates of reactions that occur in time as short as several femtoseconds (femto = 10 -15 ). 13.2 – The Rate of a Chemical Reaction The rate of a chemical reaction is a measure of how fast the reaction occurs. o If a chemical reaction has a slow rate, only a relatively small fraction of molecules react to form products in a given period of time. o If a chemical reaction has a fast rate, a large fraction of molecules react to form products in a given period of time. The rate of a chemical reaction is measured as a change in the amounts of reactants or products (usually in terms of concentration) divided by the change in time. (570)
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scotty 11 - Chemistry 13 Notes 13.1 Background Chemists...

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