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FAQs on Chemical kinetics practice set-3 (JAM) - Additional Documents & Tests for IIT JAM

1. What is chemical kinetics?
Ans. Chemical kinetics is the branch of chemistry that studies the rate at which chemical reactions occur and the factors that influence these rates. It involves the measurement and analysis of reaction rates, the determination of reaction mechanisms, and the prediction of reaction outcomes.
2. What are the factors that affect the rate of a chemical reaction?
Ans. Several factors influence the rate of a chemical reaction. These include temperature, concentration of reactants, presence of catalysts, surface area, and pressure (in case of gaseous reactions). Increasing the temperature and concentration generally increases the reaction rate, while the presence of catalysts can speed up the reaction. Similarly, increasing the surface area of reactants and pressure (in case of gaseous reactions) can also enhance the reaction rate.
3. How is the rate of a chemical reaction 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 various techniques such as monitoring absorbance or color change, measuring gas evolution, or using techniques like spectroscopy. By analyzing the data obtained, the rate equation and rate constant for the reaction can be determined.
4. What is the difference between the rate constant and reaction rate?
Ans. The rate constant (k) is a proportionality constant that relates the concentration of reactants to the rate of a chemical reaction. It appears in the rate equation and is specific to a particular reaction at a given temperature. On the other hand, the reaction rate is the speed at which reactants are consumed or products are formed during a chemical reaction. It is determined experimentally and depends on the concentrations of reactants and the rate constant.
5. How does temperature affect the rate of a chemical reaction?
Ans. Temperature has a significant effect on the rate of a chemical reaction. Increasing the temperature generally increases the reaction rate. This is because at higher temperatures, reactant molecules possess more kinetic energy, leading to more frequent and energetic collisions between them. As a result, the number of successful collisions with sufficient energy to overcome the activation energy barrier increases, resulting in a faster reaction rate.
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