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Why half life of first order reaction does not depend upon the concentration?
Wiki User
∙ 12y ago
- half life of a chemical reaction is the time which is required and it does not depend upon concentration of reactantuired to convert hlaf of reactant into product and it depend upon the nature of reaction and condition of r
Wiki User
∙ 12y ago
Wiki User
∙ 12y agoSecond order reaction rate equation in differential form:
-dA/dt = 2.k.[A]2
which after integration gives :
([A]t)-1 = ([A]o)-1+ k.t
from which t1/2 is distilled by using [A]1/2 = 1/2*[A]0 , so
t1/2 = 1 / k.[A]o
[Cf. link to 'Summary for all reaction orders: 0, 1, 2, and n' in Related links just below this answer page.]
Wiki User
∙ 14y agoNo, the half life for the first order reaction is not dependent on concentration, the half life equals 0.693 divided by a constant, k
Wiki User
∙ 11y agoYes! Only first order reactions have a constant half-life
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How do you prove graphically that a reaction is first order?
If a reaction is first order, a graph of reaction rate against reagent concentration will be a straight line.
How is the effect of concentration changes on the reaction rate seen in the rate?
That depends on the order of the reaction. If the reaction is zero order with respect to a reactant, then changing the concentration will have no effect on rate. If it is first order, then doubling the concentration will double the rate. If it is second order, then doubling the concentration will quadruple the rate.
How is order of reaction determined graphically?
in our syllabus there is only the first and the zero order reaction in which if the graph is plotted between the concentration and time then it is a zero order reaction while if the graph is between the log of concentration and time then the reaction is of the first order.hope this will help u.
According to the rate law how do concentration affect rate?
The rate will be dictated by the rate law. The concentration may have NO effect on rate in a zero order reaction, or it may be directly proportional to the concentration in a first order reaction. Also, in second order reaction, doubling the concentration will increase the rate by FOUR times.
How does the concentration of reactant affect the rate of a reaction?
Increasing the concentration increases the molecules' collision frequency.
How do you prove graphically that a reaction is first order?
If a reaction is first order, a graph of reaction rate against reagent concentration will be a straight line.
How is the effect of concentration changes on the reaction rate seen in the rate?
That depends on the order of the reaction. If the reaction is zero order with respect to a reactant, then changing the concentration will have no effect on rate. If it is first order, then doubling the concentration will double the rate. If it is second order, then doubling the concentration will quadruple the rate.
How is order of reaction determined graphically?
in our syllabus there is only the first and the zero order reaction in which if the graph is plotted between the concentration and time then it is a zero order reaction while if the graph is between the log of concentration and time then the reaction is of the first order.hope this will help u.
According to the rate law how do concentration affect rate?
The rate will be dictated by the rate law. The concentration may have NO effect on rate in a zero order reaction, or it may be directly proportional to the concentration in a first order reaction. Also, in second order reaction, doubling the concentration will increase the rate by FOUR times.
If you double a concentration of a reactant then the rate of the reaction doubled The order with respect to the reactant is?
First order; the rate is directly proportional to the concentration of reactant.
How is rate of a chemical reaction usually expressed?
Rates of reaction can be expressed depending upon their order.For example say you have a reaction between two chemicals and the initial rate for that reaction is known :-when:-The concentration of one of the reactants is doubled and the other reactants concentration remains the same and the overall rate of reaction does not change - reaction is zero orderwith respect to chemical which was doubled.The concentration of one of the reactants is doubled and other reactants concentration remains the same and the overall rate of reaction doubles - reaction is first order with respect to chemical which was doubled.The concentration of one of the reactants is doubled and other reactants concentration remains the same and the overall rate of reaction quadruples - reaction is second order with respect to chemical which was doubled.Zero Orderrate = kFirst Orderrate = k [A] (reaction is 1st order with respect to [A] and 1st order overall)Second Orderrate = k [A][B] (reaction is first order with respect to [A] and first order with respect to[B], reaction is second order overall)rate = k [A]2 (reaction is second order with respect to [A] and second order overall)Orders are simply added together in order to determine the overall order of reaction :-rate = k [A][B][C] would be third order overall and first order with respect to each of the reactantsThere are other orders of reaction, for example 2 and 3 quarter orders and third order reactions, but these are a little more complex.
What effect does the concentration of reactants have on the rate of speed?
The effect of concentration of reactants on rate of reaction depends on the ORDER of the reaction. For many reactions, as the concentration of reactants increases, the rate of reaction increases. There are exceptions however, for example a zero order reaction where the rate of reaction does not change with a change in the concentration of a reactant.
How does the concentration of reactant affect the rate of a reaction?
Increasing the concentration increases the molecules' collision frequency.
What effect does the concentration of reactants have on the the rate of a reaction?
The effect of concentration of reactants on rate of reaction depends on the ORDER of the reaction. For many reactions, as the concentration of reactants increases, the rate of reaction increases. There are exceptions however, for example a zero order reaction where the rate of reaction does not change with a change in the concentration of a reactant.
Why radioactivity is considered as a first order reaction?
Radioactivity is the disintegration of the substance by its own. This means disintegration depends only on one reactant concentration i.e.,on itself. So this is a first order reaction.
What is meant by the order of a chemical reaction?
The reaction order is the law in which determines which elements will begin the process first. It is dependent upon the Kinetic energy of each element. The reaction order in chemistry is difficult to determine.
What is the unit of first order reaction?
A zero-order reaction is a reaction that proceeds at a rate that is independent of reactant concentration. Typically with increasing or decreasing reactants
