# Write an expression for the reaction rate law

## Order of reaction

Rate laws are laws as defined in Chapter 1 ; that is, they are mathematical descriptions of experimentally verifiable data. We have already established that a change in concentration can affect the rate at which a reaction proceeds collision theory. So let's say we wanna figure out what the effect of the concentration of A has on our rate of our reaction. And so those would also be your units for K. So we've increased the rate by a factor of nine. One typically measures the initial rate for several different sets of concentrations and then compares the initial rates. All right, we could have done it for our other comparison as well. What is the rate expression with respect to time if 2A are converted to 3C? Key Takeaways Reaction rates can be determined over particular time intervals or at a given point in time.

So we've increased the rate by a factor of nine. Given the following data, what is the reaction order? What correlation does the reaction order have with the stoichiometry of the overall equation? So we've increased the concentration of B, not A, and let me change that laughs. Conversely, increasing or decreasing the concentration of water has no effect on the reaction rate. So now we think to ourself, two to what power, I'll make it Y, two to what power is equal to four? And let's write a general rate law.

So one over seconds times molar squared. The rates of the reactions of nitrogen oxides with ozone are important factors in deciding how significant these reactions are in the formation of the ozone hole over Antarctica Figure 1.