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FAQs on Revision Notes: Chemical Kinetics - Chemistry Class 12 - NEET

1. What is chemical kinetics?
Ans. Chemical kinetics is the branch of chemistry that deals with the study of the rates of chemical reactions and the factors that influence them. It involves the measurement and analysis of reaction rates, including how the concentration of reactants and temperature affect the speed at which a reaction occurs.
2. What are the factors that affect the rate of a chemical reaction?
Ans. Several factors can influence the rate of a chemical reaction. Some of the key factors include the concentration of reactants, temperature, surface area, presence of catalysts, and the nature of the reactants. Increasing the concentration of reactants, raising the temperature, or using a catalyst can accelerate the reaction rate, while decreasing the surface area or changing the nature of the reactants may slow it down.
3. How is the rate of a chemical reaction determined?
Ans. The rate of a chemical reaction can be determined by measuring the change in concentration of reactants or products over time. This can be done by monitoring the appearance or disappearance of a particular substance using techniques such as spectroscopy or titration. By collecting data at different time intervals, a graph can be plotted to determine the rate of the reaction.
4. What is the difference between reaction rate and rate constant?
Ans. The reaction rate refers to the speed at which a chemical reaction takes place, while the rate constant (k) is a proportionality constant that relates the rate of a reaction to the concentration of reactants. The rate constant is specific to a particular reaction at a given temperature and is independent of reactant concentrations. It is used in mathematical expressions, such as the rate equation, to describe the relationship between reactant concentrations and reaction rate.
5. How does temperature affect the rate of a chemical reaction?
Ans. Temperature has a significant effect on the rate of a chemical reaction. As the temperature increases, the average kinetic energy of the reactant molecules also increases. This leads to more frequent and energetic collisions between the reactant particles, resulting in a higher reaction rate. According to the Arrhenius equation, the rate constant (k) of many reactions approximately doubles for every 10-degree Celsius increase in temperature.
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