High Quality Content by WIKIPEDIA articles! In chemistry, a stressor is something that either speeds up a reaction rate or keeps the reaction rate the same. Stressors include light, temperature and elevated sound levels. Stressors also include the phenomena of substance concentration, catalysis, substance surface area, and the nature of the reactants. In accordance with Le Chatelier's Principle, reactions shift away from stressors. For example, see the following equilibrium reaction. There are three distinct species: CO, H2 and CH3OH. CO + 2H2 ? CH3OH If the concentration of any of these species is changed, the reaction will shift accordingly. If [CO] is increased, the reaction will progress towards the products. If [CH3OH] is increased, the reaction will progress towards the reactants.

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