# What is the overall reaction order for the following rate law: rate = k [a]2[b]?

## What is the overall order of the reaction given the rate law?

The overall reaction order is simply the sum of orders for each reactant. For the example rate law here, the reaction is third order overall (1 + 2 = 3).

## What is K equal to in the rate law?

The proportionality constant, k, is known as the rate constant and is specific for the reaction shown at a particular temperature. The rate constant changes with temperature, and its units depend on the sum of the concentration term exponents in the rate law.

## What is the order of the reaction with respect to A and B?

The overall order of the reaction is found by adding up the individual orders. For example, if the reaction is first order with respect to both A and B (a = 1 and b = 1), the overall order is 2.

## How is the rate of reaction affected if the concentration of B is doubled?

For a reaction A + B → P, the rate is given by Rate = k[A] [B] … (i) Since the given reaction has order two with respect to reactant B, thus if the concentration of B is double in the given reaction, then the rate of reaction will become four times.

## What is the formula of rate constant?

The rate law for a zero-order reaction is rate = k, where k is the rate constant. In the case of a zero-order reaction, the rate constant k will have units of concentration/time, such as M/s.

## What is rate constant k?

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.

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## How do you write a rate law?

A rate law relates the concentration of the reactants to the reaction rate in a mathematical expression. It is written in the form rate = k[reactant1][reactant2], where k is a rate constant specific to the reaction. The concentrations of the reactants may be raised to an exponent (typically first or second power).

## What is the unit of second order reaction?

where k is a second order rate constant with units of M-1 min-1 or M-1 s-1. Therefore, doubling the concentration of reactant A will quadruple the rate of the reaction.

## What is the order of the reaction?

The Order of reaction refers to the relationship between the rate of a chemical reaction and the concentration of the species taking part in it. In order to obtain the reaction order, the rate expression (or the rate equation) of the reaction in question must be obtained.

## How do you know if a reaction is first order?

To test if it the reaction is a first-order reaction, plot the natural logarithm of a reactant concentration versus time and see whether the graph is linear. If the graph is linear and has a negative slope, the reaction must be a first-order reaction.

## What is the overall order of reaction if B is present in large excess?

(ii) What is the overall order of reaction if A is present in large excess? (i) Since the given reaction has order two with respect to reactant B, thus if the concentration of B is double in the given reaction, then the rate of reaction will become four times.

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## What does the rate of reaction tell us?

1. Reaction Rate is the measure of the change in concentration of the disappearance of reactants or the change in concentration of the appearance of products per unit time.