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PPT: Chemical Kinetics
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FAQs on PPT: Chemical Kinetics
| 1. What is the difference between rate of reaction and rate constant in chemical kinetics? |  |
Ans. The rate of reaction measures how fast a reaction proceeds and changes with concentration, temperature, and time. Rate constant (k) is a fixed value for a specific reaction at a given temperature that relates reactant concentration to reaction rate through the rate law equation. Rate constant remains unchanged during a reaction, while reaction rate varies as concentrations change.
| 2. How do I calculate the order of a reaction from experimental data? | |
Ans. Reaction order is determined by analyzing how changes in reactant concentration affect the overall reaction rate using experimental observations. Plot concentration versus time data in different ways: linear plots for zero-order, logarithmic plots for first-order, and reciprocal plots for second-order reactions. The straight-line graph indicates the reaction order for CBSE and competitive exams.
| 3. Why does increasing temperature speed up chemical reactions even with the same concentration? | |
Ans. Higher temperature increases the kinetic energy of reacting molecules, helping more of them overcome the activation energy barrier required for the reaction to proceed. The collision frequency and fraction of effective collisions both rise with temperature. This exponential relationship between temperature and reaction rate is explained by the Arrhenius equation in chemical kinetics.
| 4. What's the difference between elementary reactions and complex reactions in mechanism? | |
Ans. Elementary reactions occur in a single step as written and have a stoichiometry matching their mechanism exactly. Complex reactions involve multiple elementary steps combined sequentially, where the overall rate-determining step controls total reaction speed. Understanding reaction mechanisms helps predict rate laws and intermediate species formed during multi-step processes in NEET Chemistry.
| 5. How do catalysts work to lower activation energy without being consumed? | |
Ans. Catalysts provide an alternative reaction pathway with lower activation energy by forming temporary intermediates with reactants, speeding up both forward and reverse reactions equally. They remain chemically unchanged after the reaction completes, allowing reuse in multiple reaction cycles. Enzyme catalysis and heterogeneous catalysis demonstrate this principle in biological and industrial applications respectively.
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Document Description: PPT: Chemical Kinetics for NEET 2026 is part of Chemistry Class 12 preparation. The notes and questions for PPT: Chemical Kinetics have been prepared according to the NEET exam syllabus. Information about PPT: Chemical Kinetics covers topics like and PPT: Chemical Kinetics Example, for NEET 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT: Chemical Kinetics.
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