## Arrhenius Equation (Dependence of Rate Constant on Temperature)

Arrhenius Equation: Quantitatively, the effect of temperature on the rate of reaction and hence on the rate constant (k) was proposed by Arrhenius in 1889 called Arrhenius Equation. This equation is- k = Ae-Ea/RT Where A = Frequency Factor, Ea = Activation Energy, R = Gas Constant, T = Temperature In this equation, the factor e-Ea/RT …

## Explanation of Increase in the Rate of the Reaction with Temperature

Increase in the Rate of the Reaction with Temperature: According to the collision theory of chemical reaction, the rate of reaction depends upon- Collision Frequency (Z). Fraction of Effective Collisions (f). The effect on these two quantities, which affect the rate of reaction, by a change in temperature is described below- (1) Increase in Collision Frequency- …

## Difference Between Order of Reaction and Molecularity of Reaction

Order of Reaction and Molecularity of Reaction: The following are the points of difference between the order of reaction and molecularity of reaction. Order of Reaction Molecularity of Reaction It is the number of reacting molecules whose concentration actually changes during the reaction. It is the number of reacting species as indicated by the balanced chemical …

## Factors Affecting the Rate of Reaction

Factors Affecting the Rate of Reaction: The rate of any particular reaction depends upon the following factors- Concentration of Reactants- The rate of reaction depends upon the concentration of the reactants. This is clear from the Law of mass action, according to which the rate of reaction is directly proportional to the active mass or molar …

## Determination of Rate Law, Rate Constant and Order of Reaction

Determination of Rate Law, Rate Constant and Order of Reaction: Different experimental methods used for the determination of the rate law, rate constant and order of reaction are briefly described below- (1) Graphical Method- This method can be used when there is only one type of reactant. It is hit and trial method. Example- Consider the …

## Molecularity of Reaction

Molecularity of Reaction: The number of atoms, ions or molecules that must collide with one another simultaneously so as to result into a chemical reaction is called the molecularity of the reaction. It is a theoretical concept and does not convey anything about the mechanism of the reaction. Molecularity of reaction can be 1, 2, 3, …

## Order of Reaction

Order of Reaction: The number of reactant molecules whose concentration actually determines the rate of reaction is called the order of reaction. In other words, the order of reaction is the sum of the powers to which concentration terms are raised in the rate law expression. Example- For a reaction, aA + bB + cC ———-> …

## Rate Constant and Specific Rate Constant

Rate Constant and Specific Rate Constant: According to the law of mass action, the rate of reaction is directly proportional to the concentration of reactants raised to their stoichiometric co-efficient. For a general reaction, aA + bB ———-> Products Rate of reaction ∝ a b or Rate (dx/dt) = k a b Where and are the …

## Rate of Chemical Reaction

What is Chemical Kinetics? Chemical Kinetics is a branch of physical chemistry, that deals with the rates of chemical reactions and the mechanism by which they occur. Rate of Chemical Reaction: It is defined as the change in concentration of any one of the reactants or products in a particular time interval. Consider a hypothetical reaction- …

## Modes of Nutrition

Modes of Nutrition: Two modes of nutrition are recognized in organisms. These are autotrophic or photosynthetic and holotrophic or ingestive. (1) Autotrophic Nutrition- Green plants synthesise their organic food from CO2 and water in the presence of sunlight. The process is called photosynthesis and the mode of feeding is termed autotrophic nutrition. Being a characteristic of …