# Concerning the rate law, rate = k[a]2[b], what are appropriate units for the rate constant k?

## What is the rate law Use K for the rate constant?

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 are appropriate units for the rate constant k?

The units of k depend on the order of the reaction, but the units are never Newtons per metre. As an example, for a first order reaction, k has the units of 1/s and for a second order reaction, units of 1/M.s.

## What is the 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.

## What is K in the rate law equation?

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 are the units of the rate constant for a 1/2 order reaction?

In first order reactions, the reaction rate is directly proportional to the reactant concentration and the units of first order rate constants are 1/sec. In bimolecular reactions with two reactants, the second order rate constants have units of 1/M*sec.

## What are the units of K in a 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.

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## What is the unit of K in a zero order reaction?

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 the unit of the rate of reaction?

Summary. For the purposes of rate equations and orders of reaction, the rate of a reaction is measured in terms of how fast the concentration of one of the reactants is falling. Its units are mol dm-3 s-1.

## How do you determine the rate determining step?

The overall reaction rate depends almost entirely on the rate of the slowest step. If the first step is the slowest, and the entire reaction must wait for it, then it is the rate-determining step.

## Can K value be negative?

A rate constant(k) cannot be negative because it is measuring how fast the concentration changes over time so it cannot be a negative value. … in a single reaction it can’t be negative but in case there are two or more than two chemical reactions rate constant of one reaction may be negative with respect to another one.

## What affects rate constant k?

Increasing the temperature of a reaction generally speeds up the process (increases the rate) because the rate constant increases according to the Arrhenius Equation. As T increases, the value of the exponential part of the equation becomes less negative thus increasing the value of k.

## What is the relationship between K and the rate constants?

The ratio of the rate constants for the forward and reverse reactions at equilibrium is the equilibrium constant (K), a unitless quantity. The composition of the equilibrium mixture is therefore determined by the magnitudes of the forward and reverse rate constants at equilibrium.