# Chemical Kinetics QuestionDetermination of order of reaction

• nishantve1
In summary, the conversation discusses the decomposition of N2O5 and the resulting linear plot between P(N205) and t with a negative slope. The question is whether the reaction follows zero-order or first-order kinetics, with the answer being first-order kinetics due to the negative slope of the plot between ln[A] and time. The conversation also briefly mentions the products of the reaction.
nishantve1

## Homework Statement

So the question says
for the reaction 2N2O5(g) --> 4NO2 (g) + O2(g) provides a linear plot when P(N205) is plotted against t with a negative slope . The decomposition of N2O5 follows ?

## The Attempt at a Solution

I am guessing that P(N205) is pressure of N2O5 since for gases pressure is equivalent to Concentration so the plot will be between Concentration of N2O5 and time and the negative sloe would be -k the rate constant looking at this in my opinion the answer should be "zero-order kinetics" since for zero order kinetics plot between [A] and t has a negative slope .

But the answer in the text is "First order kinetics" how ? I mean yes for first order the plot between ln[A] and time has a negative slope but how is that applicable in this case ?

Err... what can you say about the products?

## 1. What is chemical kinetics and why is it important?

Chemical kinetics is the study of the rates at which chemical reactions occur. It is important because it helps us understand and predict the speed of reactions, which is crucial in fields such as pharmaceuticals, materials science, and environmental science.

## 2. How is the order of a reaction determined?

The order of a reaction is determined by conducting experiments and analyzing the data. The most common method is the method of initial rates, where the initial concentrations of reactants are varied and the change in concentration over time is measured. By comparing the initial rates, the order of the reaction can be determined.

## 3. What factors can affect the order of a reaction?

The order of a reaction can be affected by factors such as temperature, concentration of reactants, and the presence of a catalyst. Changes in these factors can alter the rate of the reaction and therefore change the order of the reaction.

## 4. How does the order of a reaction affect the rate of the reaction?

The order of a reaction directly affects the rate of the reaction. A higher order means that the rate of the reaction is more sensitive to changes in the concentration of the reactants. For example, a second-order reaction will have a faster rate compared to a first-order reaction with the same initial concentrations.

## 5. Can the order of a reaction change over time?

Yes, the order of a reaction can change over time. This is often seen in complex reactions where the reaction mechanism involves multiple steps. In these cases, the order of the reaction may change as the reaction progresses and different reactants or intermediates become more or less important in determining the overall rate of the reaction.

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