For JEE exam:

1. Rate of a reaction: It is the change in concentration of reactants or products with respect to time.
2. Factors affecting the rate of a reaction:
   • Concentration: The rate of a reaction increases with increase in concentration of reactants.
   • Temperature: The rate of a reaction increases with increase in temperature.
   • Surface area: The rate of a reaction increases with increase in surface area of the reactants.
   • Catalysts: The presence of a catalyst increases the rate of a reaction without being consumed in the reaction.
3. Rate constant: The rate constant is a proportionality constant that relates the rate of a reaction to the concentrations of the reactants.
4. Order of reaction: The order of a reaction is the sum of the exponents of the concentrations of the reactants in the rate law.
5. Molecularity of a reaction: The molecularity of a reaction is the number of molecules that participate in the rate-determining step of the reaction.
6. Integrated rate equations: The integrated rate equations are mathematical equations that relate the concentration of reactants or products to time.
7. Arrhenius equation: The Arrhenius equation relates the rate constant of a reaction to the activation energy and temperature.
8. Collision theory of reaction rates: The collision theory of reaction rates states that the rate of a reaction is proportional to the number of collisions between the reacting molecules.
9. Transition state theory: The transition state theory states that the rate of a reaction is determined by the formation of a high-energy transition state.
10. Lindemann mechanism: The Lindemann mechanism is a theory of unimolecular reactions that involves the formation of an excited molecule that then reacts with another molecule.
11. Hinshelwood mechanism: The Hinshelwood mechanism is a theory of heterogeneous reactions that involves the adsorption of reactants onto a surface and subsequent reaction.
12. Chain reactions and free radical mechanisms: Chain reactions are reactions that involve a series of steps, each of which produces a free radical that reacts with another molecule to continue the chain. Free radical mechanisms are chain reactions that involve the formation and reaction of free radicals.

For CBSE board exam:

1. Concept of rate of reaction: It refers to how quickly a chemical reaction takes occurs.
2. Factors affecting the rate of a reaction:
   • Concentration: Higher concentrations lead to faster reactions.
   • Temperature: Increased temperatures accelerate reactions.
   • Surface Area: Larger surface areas for solids and greater contact for liquids and gases enhances reactions.
   • Catalysts: These are substances that speed up reactions without getting consumed in the process.
3. Graphical representation of the rate of the reaction: You can plot a graph with time (x-axis) and concentration or pressure (y-axis) to get a visual representation of the reaction’s progress.
4. Order of a reaction: Defines how the reaction rate is related to the concentration of reactants involved, calculated by the rate law.
5. Units of rate constant: This depends on the order of reaction, for first order it’s s^(-1), for second order it’s dm^3 mol^(-1) s^(-1).
6. Half-life of a reaction: The time taken for the concentration of reactants to reduce by half of the original value.
7. Arrhenius equation and energy barrier: The equation connects rate constant (k), activation energy (Ea), universal gas constant (R), and temperature (T). It showcases how increasing the temperature raises the reaction rate.
8. Effect of temperature on rate constant: Higher temperatures increase rate constant.
9. Collision theory of reaction rate (qualitative treatment): This theory suggests that particles have to collide to bring about a reaction, and effective collisions give rise to products.