CONCEPTS REACTION RATE

1. Definition of Reaction Rate

The rate stated how fast or how slow a process. The rate also said the magnitude of change that occurs in one satua time. Time unit can be seconds, minutes, hours, days or years.
A chemical reaction is a process of change reactants into products. Along with increasing the reaction time, the amount of substance peraksi the less, while more and more products. The reaction rate is expressed as the rate of reduction in the rate of formation of reactants or products.

2. The expression rate of reaction for Homogeneous Systems

For the homogeneous system, the general reaction rate is expressed as the molar concentration of reactants penguragan rate or the rate of molar concentration of products for a time,


3. The average of the rate and rate of moment

a. The rate of average

The rate of the average is the average rate for a specified time interval. The difference between the average rate of the instantaneous rate can be likened to the vehicle speed. For example, a vehicle a distance of 300 km in 5 hours. The rate of the average vehicle is 300 km / 5 hr = 60 km / h. Of course, the vehicle speed is not always 60 km / h. The rate of instantaneous indicated by the vehicle speedometer.

b. The rate of moment

The rate is the instantaneous rate at any given moment. As we have seen before, the reaction rate changes from time to time. In general, the smaller the rate of the reaction along with increasing reaction time. therefore, the shape of the plot of concentration versus time curve, as shown below. The rate of a moment in time t can be determined from the slope (gradient) is tangent at t, as follows.

     Painting tangent at t
     Paint the triangle to determine the slope
     instantaneous rate = slope of the tangent