Molecules are only available for basic reactions they are one-step reactions And the rate depends on the concentration of each molecule, and in the case of complex reactions, multiple reactions are involved, so the molecules don’t make sense.

Why do molecules only work for basic reactions and order for basic and complex reactions?

A: Complex reactions occur through multiple steps, the basic reactions. The number of molecules involved in each basic reaction may vary, i.e. the number of molecules in each step may vary. so, Talking about molecularity is meaningless overall complex response.

Are the number and order of molecules in the basic reaction the same?

The kinetic order of any elementary reaction or reaction step is equal to its number of moleculesso the rate equation for the fundamental reaction can be determined from the number of molecules by examining it.

Why are molecules undefined in complex reactions?

Reacting molecules can only be defined for elementary reactions, because Complex reactions are not done in one step It is almost impossible that all molecules of all reactants are in an encounter state at the same time.

Can the number of molecules for a reaction be zero?

The number of reacting substances involved in the basic reaction, which must collide at the same time to cause a chemical reaction, is called the number of reacted molecules. Molecules are a theoretical concept. Molecules cannot be zero, negative, infinite and imaginary.

Why molecularity only applies to elementary reactions and order to elementary reactions

21 related questions found

Is molecular structure only defined for RDS?

Number of molecules is only defined in RDS complex reaction.

Can molecule and order be the same?

The molecules of the slowest step involved in a complex reaction are in the same order as the reaction. However, The order of the basic reactions and the number of molecules are the same.

Which reaction order and molecular formula are the same?

basic reaction have the same order and numerator values.

For example, what are the basic reactions?

A basic reaction is a chemical reaction in which reactants directly form products. …examples of basic reactions include Cis-Trans Isomerization, Thermal Decomposition, and Nucleophilic Substitution.

Can a numerator be negative?

this Numerator value cannot be zero, negative, fractions, infinite and imaginary numbers. Therefore, it can only be a positive integer. The number of molecules cannot have a value greater than 3, as more than three molecules may not collide or come close to each other during a chemical reaction.

Why are trimolecular fundamental reactions so rare?

The number of molecules reacted is the number of molecules reacted in the basic step. … molecular reactions are Relatively rare because they involve three molecules colliding in the correct orientation at the same time, a rare event. When trimolecular reactions do occur, they tend to be very slow.

What is a molecule, for example?

Simplest case: unimolecular reactions

Similarly, a single-step chemical reaction is said to have one molecule if only one molecule is converted to the product. We call this a unimolecular reaction.An example is Decomposition of N2 O4. N2 O4 (g) → 2NO2 (g)

What are the 3 complex reactions?

Chemical kinetics fall into three categories, Mathematical, detailed and applied dynamicswhile their basic reactions are described as unimolecular, bimolecular, and trimolecular reactions.

Which reaction cannot be determined experimentally?

The order, rate, and rate constant can be determined experimentally, but molecular It cannot be determined experimentally.

Does a zero-order reaction have zero molecules?

Answer: No, The number of molecules in the reaction will never be zero. . . so a zero molecule means that there are no reactants, so no reaction will occur.

What does special molecule mean?

Intermolecular reactions: A fundamental reaction involving the simultaneous collision of any combination of three molecules, ions, or atoms.

What is the type of reaction defined by +Δ?

Exothermic reaction is « a reaction in which the total standard enthalpy change ΔH⚬ is negative ». Exothermic reactions typically release heat and require the replacement of weaker bonds with stronger ones. …most of the spectacular chemical reactions shown in class are exothermic and exothermic.

Why are higher-order reactions rare?

– The probability of three or more molecules colliding at the same time in a chemical reaction is very small. … – so higher-order (>3) reactions are rare Due to the low probability of all reacting species colliding at the same time.

Can a reaction have zero activation energy?

The activation energy Ea of a reaction is the limit that should be overcome for the conversion of reactants to form products. …which suggests that every collision could lead to an unlikely chemical reaction. therefore, Chemical reactions cannot have zero activation energy.

What is the reaction order of radioactive decay?

Calculation using the first-order rate equation: r = k[N]

Since the radioactive decay rate is first order, we can say: r = k[N]1, where r is a measure of the decay rate, k is the first-order rate constant of the isotope, and N is the amount of radioisotope at which the rate is measured.

When the molecule is not defined?

this minimum amount The number of molecules, atoms or ions of reactants required for a basic reaction to occur is represented by the sum of the stoichiometric coefficients of the reactants in a chemical equation, called the molecular degree of the reaction. So molecularity doesn’t make sense for complex reactions.

Are molecular structures defined for complex reactions?

Molecular numbers are only defined for elemental reactions, i.e. reactions that take place in a single step.A sort of Complex reactions cannot have an overall molecular structure. Only each step of a complex reaction has a molecular structure.

Does molecular structure have any significance for complex reactions?

molecular Meaningless for complex reactions.