Chapter+14,+Section+1

S11.A.1.3.2 Describe or interpret dynamic changes to stable systems (e.g.,chemical reactions, human body, food webs, tectonics, homeostasis).

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 * This page contains information that is specific to Chapter fourteen material. Click here to see the procedure for the lab that we will be completing for this chapter (Reaction rates).**======

Chemical Reaction Rates
The reaction rates of chemical reactions are the amounts of a reactant reacted or the amount of a product formed per unit time, (moles per second). Often, the amount can be expressed in terms of concentrations. code **//amount reacted or produced Rate// = --- units: g/s, mol/s, or %/s //time interval//**

code At certain conditions, the rates are functions of concentrations. Depending on the time interval between measurements, the rates are called However, a more realistic representation for a reaction rate is the change in concentration per unit time, either the decrease of concentration per unit time of a reactant or the increase of concentration per unit time of a product. In this case, the rate is expressed in Mol/(L sec). code **//concentration change of           a reactant or product Rate// = --- units: g/(M s), M/s, ppm/s etc //time interval//**
 * average rate**: rate measured between long time interval
 * instantaneous rate**: rate measured between very short interval
 * initial rate**: instantaneous rate at the beginning of an experiment

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