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Chemical kinetics is the branch of chemistry that deals with the study of the rates of chemical reactions and the factors that influence those rates. It focuses on understanding how and why reactions occur at different speeds and how reactants are transformed into products over time.

Graph Depicting Activation EnergyGraph Depicting Activation Energy

The following Index outlines the essential Key Concepts and Terms that we will explore and grasp in this section. 

Index: Chemical Kinetics | Chemistry Class 12 - NEET

1. Rate of a chemical reaction

The rate of a chemical reaction is the change in concentration of reactants or products per unit of time. It is often expressed as the rate of disappearance of a reactant or the rate of appearance of a product.

You can understand the Rate of Reaction through:

2. Factors influencing rate of a reaction

The rate of a chemical reaction can be influenced by various factors. Some of the key factors that affect the rate of a reaction are mentioned here:

3. Rate expression, order and molecularity

The rate expression, order, and molecularity are key concepts in chemical kinetics that describe and quantify how chemical reactions occur. Explore the concepts here:

4. Integrated rate equation

The integrated rate equation is an expression that relates the concentrations of reactants or products in a chemical reaction to time. Here are the most common integrated rate equations for different reaction orders:

5. Zero order reaction

Index: Chemical Kinetics | Chemistry Class 12 - NEET

6. First order reaction

Index: Chemical Kinetics | Chemistry Class 12 - NEET

7. Energy of activation

8. Temperature dependence on reaction

9. Half life of a reaction

10. Collision theory of chemical reaction

11. NEET Questions

12. NCERT Materials

13. Chapter tests and other docs

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FAQs on Index: Chemical Kinetics - Chemistry Class 12 - NEET

1. What is chemical kinetics?
Ans. Chemical kinetics is the branch of physical chemistry that studies the rates of chemical reactions and the factors that influence them. It involves the study of how fast or slow chemical reactions occur, the mechanisms by which they occur, and the factors that affect the rate of reaction.
2. What are the factors that affect the rate of a chemical reaction?
Ans. Several factors can affect the rate of a chemical reaction. These include temperature, concentration of reactants, presence of catalysts, surface area, and pressure (for gas-phase reactions). Increasing temperature generally increases the rate of reaction, while increasing the concentration of reactants and the surface area of the reactants also tend to increase the rate. Catalysts can speed up reactions by providing an alternative reaction pathway with lower activation energy.
3. How can the rate of a chemical reaction be determined experimentally?
Ans. The rate of a chemical reaction can be determined experimentally by measuring the change in concentration of reactants or products over time. This can be done by monitoring the absorbance or color change of the reaction mixture, measuring the volume of gas evolved, or using techniques such as chromatography or spectroscopy. The initial rate of reaction can be determined by measuring the rate at the beginning of the reaction when the reactant concentrations are highest.
4. What is the order of a chemical reaction?
Ans. The order of a chemical reaction refers to the mathematical relationship between the rate of the reaction and the concentrations of the reactants. It can be determined experimentally by varying the concentrations of reactants and measuring the corresponding change in reaction rate. The order can be zero, first, second, or even fractional. For example, a zero-order reaction means that the rate is independent of the reactant concentration, while a first-order reaction means that the rate is directly proportional to the concentration of one reactant.
5. How do catalysts affect the rate of a chemical reaction?
Ans. Catalysts increase the rate of a chemical reaction by providing an alternative reaction pathway with lower activation energy. They do not undergo any permanent change themselves during the reaction, so they can be used repeatedly. Catalysts work by lowering the energy barrier (activation energy) that must be overcome for the reaction to occur. This allows more reactant molecules to have sufficient energy to react, increasing the rate of the reaction.
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