CHEM 1620 Chapter Notes - Chapter 16: Arrhenius Equation, Reaction Rate Constant, Rate Equation

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silvercamel857

15 Mar 2016

School

University of Virginia

Department

Chemistry

Course

CHEM 1620

Professor

Metcalf Dave

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Document Summary

Chemical reactions vary greatly in the speed at which they occur. Some are essentially instantaneous, while others may take years to reach equilibrium. The reaction rate for a given chemical reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time. The speed of a chemical reaction may be defined as the change in concentration of a substance divided by the time interval during which this change is observed: For a reaction of the form a+b c, the rate can be expressed in terms of the change in concentration of any of its components rate= [a]/ t rate= [b]/ t rate= [c]/ t. Consider now a reaction in which the coefficients are different: Example 1 - for the oxidation of ammonia. Rate=- [a]/ t=- [b]/3 t= [d]/2 t it was found that the rate of formation of n2 was 0. 27 mol l 1 s 1.

Related Questions

The rate of reaction indicates the speed at which the reaction can occur. It can be expressed in terms of a change in the concentration of reactants or products per unit of time:

rate = concentration changetime change

The rate of reaction can be defined either as a decrease in the concentration of a reactant per unit of time or as an increase in the concentration of a product per unit of time.

Select the image to explore the activity that shows the different ways in which the rate of a reaction can be expressed.

When you click on the "Disappearance of reactants," "Appearance of products," or "Rate law expression" button, you will observe different expressions for the rate of the reaction.

Consider the following reaction:

2A+3Bâ3C+2D

Use the following data to determine the rate of reaction in terms of the disappearance of reactant A at time = 20 s.

Time (s)	0	20	40
[A](M)	0.1200	0.0720	0.0540

Express your answer in molar concentration per second to three significant figures.

Part B

Consider the following reaction:

2A+3Bâ3C+2D

Use the following data to determine the rate of reaction in terms of the appearance of product C when the time is 20 s.

Time (s)	0	20	40
[C](M)	0.000	0.0720	0.1440

Show transcribed image text

The rate of reaction indicates the speed at which the reactioncan occur. It can be expressed in terms of a change in theconcentration of reactants or products per unit of time:

The rate of reaction can be expressed either as a decrease in theconcentration of a reactant per unit of time or as an increase inthe concentration of a product per unit of time.

rate=concentrationchenge/time change

a) consider the follwing reaction:
2A+3B---->3C+2D
use the following data to determine the average rate of ractionbetween time0 s and 20s
time(s)0 20 40
[A](M) 0.0800 0.0480 0.0360

express answere in molar concentration persecond to threesignificant figures.

The rate of reation= ? M*s^-1

CHEM 1620 Chapter Notes - Chapter 16: Arrhenius Equation, Reaction Rate Constant, Rate Equation

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