# What is the rate law for the reaction a B –> C?

The rate law of the overall reaction A + B to C is rate = k(A)^2.

## How do you find rate laws?

To determine the rate law from a table, you must mathematically calculate how differences in molar concentrations of reactants affect the reaction rate to figure out the order of each reactant. Then, plug in values of the reaction rate and reactant concentrations to find the specific rate constant.

## How do you write a rate law in chemistry?

In general, a rate law (or differential rate law, as it is sometimes called) takes this form: rate=k[A]m[B]n[C]p… in which [A], [B], and [C] represent the molar concentrations of reactants, and k is the rate constant, which is specific for a particular reaction at a particular temperature.

## What is rate of reaction formula?

The rate could be expressed in the following alternative ways: d[Z]/dt, –d[A]/dt, –d[B]/dt, dz/dt, −da/dt, −db/dt where t is the time, [A], [B], and [Z] are the concentrations of the substances, and a, b, and z are their amounts. Note that these six expressions are all different from one another but are simply related.

## How do you find the rate law from a graph?

Using the appropriate data from the table and the linear graph corresponding to the rate law for the reaction, calculate the slope of the plotted line to obtain the rate constant for the reaction.

## How do you find the rate law from a slow step?

The rate equation is derived by the slowest step in the reaction. When writing a rate equation you set up the equation by writing rate is equal to the rate constant of the slowest step times the concentrations of the reactant or reactants raised to there reaction order.

## What is the rate constant for the reaction 2A B → C?

The rate equation for the reaction 2A + B → C is found to be: rate = k[A][B].

## How do you calculate reaction order from concentration and time?

Take three consecutive points from the concentration versus time data. Calculate ΔyΔx for the first and second points. The concentration is the y value, while time is the x value. Do the same for the second and third point.

## How do you find the order of a reaction from an equation?

Add the exponents of each reactant to find the overall reaction order. This number is usually less than or equal to two. For example, if reactant one is first order (an exponent of 1) and reactant two is first order (an exponent of 1) then the overall reaction would be a second order reaction.

## What is K in a rate law?

The specific rate constant (k) is the proportionality constant relating the rate of the reaction to the concentrations of reactants. The rate law and the specific rate constant for any chemical reaction must be determined experimentally. The value of the rate constant is temperature dependent.

## What is the rate law for a second order reaction?

Second order reactions can be defined as chemical reactions wherein the sum of the exponents in the corresponding rate law of the chemical reaction is equal to two. The rate of such a reaction can be written either as r = k[A]2, or as r = k[A][B].

## What is the rate law for a first order reaction?

In a first–order reaction, the reaction rate is directly proportional to the concentration of one of the reactants. A first–order reaction depends on the concentration of one reactant, and the rate law is: r=−dAdt=k[A] r = − dA dt = k [ A ] .

## What is rate law in Chemistry 12?

A rate law shows how the rate of a chemical reaction depends on reactant concentration. For a reaction such as aA → products, the rate law generally has the form rate = k[A]ⁿ, where k is a proportionality constant called the rate constant and n is the order of the reaction with respect to A.

## What is the rate equation for reaction 2A+ B → C if the order of the reaction is zero?

Solution : For reaction `2A+BrarrC` if the rate of reaction is zero then it can be represented as
`” “”Rate”=k[A]^(0)[B]^(0)=k`
i.e., rate of reaction is independent of concentration of A and B.

## What are the units for rate law?

A The rate law contains only one concentration term raised to the first power. Hence the rate constant must have units of reciprocal seconds (s−1) to have units of moles per liter per second for the reaction rate: M·s−1 = M/s.

## What variables are in a rate law?

The variables In the rate law the rate is dependent on the reaction concentrations so: R the reaction rate is the dependent variable representing the change in concentration of any species related to time and can be expressed in terms of either reactants or products.

## What is rate constant in chemistry?

The rate constant, or the specific rate constant, is the proportionality constant in the equation that expresses the relationship between the rate of a chemical reaction and the concentrations of the reacting substances.

## How do you determine if a reaction is first or second order?

Initial Rate (M/s) Determine the reaction order and the rate constant. If a plot of reactant concentration versus time is not linear but a plot of 1/reaction concentration versus time is linear, then the reaction is second order.

## Does rate law only include reactants?

The mathematical relationship of reaction rate with reactant concentrations is known as the rate law. This relationship may rely more heavily on the concentration of one particular reactant, and the resulting rate law may include some, all, or none of the reactant species involved in the reaction.

## How do you find K for a 2nd order reaction?

So to find the rate constant k, we need to divide the slope by two, which gives us 0.0817. To find the units for K, remember that slope is equal to change in y over change in x, and on our Y axis, our units are one over molar, and the x axis the units are seconds.