Skill 9.5 Describing how temperature, concentrations, and catalysts affect reaction rates

Skill 9.5 Describing how temperature, concentrations, and catalysts affect reaction rates 

The rate of any process is measured by its change per unit time. The speed of a car is measured by its change in position with time using units of miles per hour. The speed of a chemical reaction is usually measured by a change in the concentration of a reactant or product with time using units of molarity per second (M/s). The molarity of a chemical is represented in mathematical equations using brackets. 

The average reaction rate is the change in concentration either reactant or product per unit time during a time interval  

Reaction rates are positive quantities. Product concentrations increase and reactant concentrations decrease with time, so a different formula is required depending on the identity of the component of interest  

The reaction rate at a given time refers to the instantaneous reaction rate. 

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