How do you determine the order of a chemical reaction?

The order of a chemical reaction is defined as the sum of the powers of the concentration of the reactants in the rate equation of that particular chemical reaction. Consider a general reaction: a A + b B ⇒ c C + d D .

Is a negative K possible?

No. 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.

Can order be fractional?

The order can be a positive integral value which indicates that the rate of the reaction is affected directly by the concentration of the reactants. The order can also be equal to a fractional value. It indicates an intricate relationship between the rate of the reaction and the concentration of the reactants.

What is order of reaction explain different type of order of reaction?

The order of a chemical reaction with respect to each reactant is defined as the exponent to which the concentration term of that reactant, in the rate law, is raised. The overall order of the reaction is defined as the sum of the exponents to which the concentration terms in the rate law are raised.

Is K negative first order reaction?

Zeroth-Order Reactions. rate=k. Because rate is independent of reactant concentration, a graph of the concentration of any reactant as a function of time is a straight line with a slope of −k. The value of k is negative because the concentration of the reactant decreases with time.

Can the activation energy be negative?

An elementary reaction can not have a negative activation energy: it must be zero or positive. However, a reaction mechanism that is composed of several steps may have a negative activation energy. Negative activation energy is possible even for elementary reactions.

Why is order of reaction zero or fractional?

Order of reaction can be zero or fractional as order of reaction is directly related to sum of power of reactants.

What’s the difference between first order and second order reactions?

The key difference between first and second order reactions is that the rate of a first order reaction depends on the first power of the reactant concentration in the rate equation whereas the rate of a second order reaction depends on the second power of the concentration term in the rate equation.

Why can’t a reaction have a negative activation energy?

No, it’s not possible to have a negative activation energy in a simple reaction such as an isomerisation because there is no possible way to draw to potential energy curves to give a negative activation energy.

Can the activation energy of a reaction be zero or negative comment?

Thus, a chemical reaction could not have zero energy of activation. With the support of the Arrhenius equation, we could determine the temperature, presence of catalyst, frequency, orientation of collisions, and effect of energy barrier.