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ORDER OF A REACTION
MOLECULARITY OF A REACTION
It is sum of the concentration terms on which the rate of reaction actually depends or it is the sum of the exponents of the concentrations in the rate law equation.
It is the number of atoms, ions or molecules that must collide with one another simultaneously so as to result into a chemical reaction.
It need not be a whole number i.e. it can be fractional as well as zero.
It is always a whole number.
It can be determined experimentally only and cannot be calculated.
It can be calculated by simply adding the molecules of the slowest step.
It is for the overall reaction and no separate steps are written to obtain it.
The overall molecularity of a complex reaction has no significance. It is only slowest step whose molecularity has significance for the overall reaction.
Even the order of a simple reaction may not be equal to the number of molecules of the reactants as seen from the unbalance equation.
For simple reactions, the molecularity can usually be obtained from the Stoichiometry of the equation.
What else can I help you with?
What is the relationship between concentration and reaction rate?
In general (but not always), the reaction rate will increase with increasing concentrations. If the reaction is zero order with respect to that substance, then the rate will not change.
In a first order chemical reaction the velocity of the reaction is proportional to the while in a zero order reaction the velocity of the reaction is proportional to the .?
In a first-order chemical reaction, the velocity of the reaction is proportional to the concentration of the reactant. In contrast, in a zero-order reaction, the velocity of the reaction is independent of the concentration of the reactant and remains constant over time.
What is the reaction order of the decomposition of nitrogen pentoxide?
The decomposition of nitrogen pentoxide is a first-order reaction. This means that the rate of the reaction is directly proportional to the concentration of nitrogen pentoxide raised to the power of 1.
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
What is the order of reaction if the half life of a reaction is halved as the initial concentration of the reactant is doubled.?
Second order. If the half life of a reaction is halved as the initial concentration of the reactant is doubled, it means that half life is inversely proportional to initial concentration for this reaction. The only half life equation that fits this is the one for a second-order reaction. t(1/2) = 1/[Ao]k As you can see since k remains constant, if you double [Ao], you will cause t(1/2) to be halved.
How is the molecularity of the rate-controlling step related to the overall reaction order?
The molecularity of the rate-controlling step may not necessarily be the same as the overall reaction order. The rate-controlling step is determined by the slowest step in a reaction mechanism, while the overall reaction order is the sum of the individual reactant concentrations in the rate law equation. It is possible for the molecularity of the rate-controlling step to influence the overall reaction order, but they are not always directly correlated.
Why order is zero while molecularity is not zero?
Molecularity can only have integer values(1,2,3...).So,its value canot be zero.It can be calculated by simply adding the molecules involved in a chemical reaction.
Whether order and molecularity be equal in any case?
for every elementary reactions, order and molecularity are equal
Define Pseudo unimolecular reaction with example?
there is no meaning in pseudo unimolecular reaction. Explanation: molecularity of a reaction is "the no. of species(ions, molecules or atoms) which collide simultaneously to give rise a chemical change or chemical reaction. a reaction can be called unimolecular (decomposition of ammonium nitrite to nitrogen and water) as single molecule decomposes to give rise to products a reaction can be called bimolecular (HI decomposes to H2 and I2) as two HI molecules are colliding. that means molecularity says about "actually how many species collide and there is nothing ambiguity (pseudo) in it. but a reaction can be called pseudo first order reaction (hydrolysis of sucrose) as rate of reaction depends on only sucrose conc. and water solvent conc. as is in excess do not affect the rate. if any one is having doubts in chemistry u can mail me at chemistry_krish@yahoomail.com
What are differences between credit card companies?
In order to find out what the major companies are and what the differences between said companies are, you are going to have to talk to a representative from each company and ask questions in order to do a comparison.
What differences do you detect between the three order of Greek architecture?
its epic
Is hydrochloric acid and calcium carbonate a first order reaction?
No, the reaction between hydrochloric acid and calcium carbonate is not a first order reaction. It is a decomposition reaction where the rate of reaction will not be constant as the concentration of the reactants change over time.
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.
1 What are the differences between propositional and first order logic?
Difference between Propositonal and Predicate logic
What is the relationship between the rate law and zero order in a chemical reaction?
In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactants. The rate law for a zero-order reaction is rate k, where k is the rate constant. This means that the rate of the reaction is constant and does not change with the concentration of the reactants.
How to calculate the reaction order from concentration and time?
To calculate the reaction order from concentration and time, you can use the integrated rate laws for different reaction orders. By plotting the concentration of the reactant versus time and determining the slope of the line, you can identify the reaction order. The reaction order can be 0, 1, or 2, depending on the relationship between concentration and time.
Why third order reaction usually not is not possible?
Third order reactions imply reaction between three molecules, which implies collision between three molecules. From a probability standpoint this is much less likely than, say, a second-order reaction, where only two molecules must come together.
