Class 12 Chemistry — Chapter 3: Chemical Kinetics

What you'll learn

• ▸Rate of a Chemical Reaction
• ▸Average and Instantaneous Rate
• ▸Stoichiometry and Rate Expressions
• ▸Graphical Determination of Reaction Rate
• ▸Introduction to Chemical Kinetics
• ▸Units of Reaction Rate

Chapter Summary

--- PAGE 1 --- Unit 3 Chemical Kinetics Objectives After studying this Unit, you will be able to * define the average and instantaneous rate of a reaction; * express the rate of a reaction in terms of change in concentration of either of the reactants or products with time; * distinguish between elementary and complex reactions; * differentiate between the molecularity and order of a reaction; * define rate constant; * discuss the dependence of rate of reactions on concentration, temperature and catalyst; * derive integrated rate equations for the zero and first order reactions; * determine the rate constants for zeroth and first order reactions; * describe collision theory. Chemical Kinetics helps us to understand how chemical reactions occur. Chemistry, by its very nature, is concerned with change. Substances with well defined properties are converted by chemical reactions into other substances with different properties. For any chemical reaction, chemists …

Practice Questions from this Chapter

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1. Explain reaction speed simply. Get Solution →
2. How does temperature affect reaction rates? Get Solution →
3. Give examples of everyday slow reactions. Get Solution →
4. What is the primary focus of the branch of chemistry known as chemical kinetics? Get Solution →
5. The word 'kinetics' is derived from the Greek word ‘kinesis’, which means what? Get Solution →
6. Which branch of science can predict the feasibility of a chemical reaction, for example, by determining if ΔG < 0? Get Solution →
7. If concentration is measured in mol L⁻¹ and time is in seconds, what are the units for the rate of a reaction? Get Solution →
8. Why is a negative sign used in the rate expression for a reactant, such as -Δ[R]/Δt? Get Solution →

Did you know?

• 💡 Diamonds are slowly turning into graphite, but it takes billions of years.
• 💡 Food spoils faster outside a refrigerator because heat speeds up chemical reactions.
• 💡 Rusting of iron is a chemical reaction so slow it can take many years to observe.
• 💡 Your body uses special proteins called enzymes to quickly digest your food.
• 💡 Mixing baking soda and vinegar causes a very fast chemical reaction with bubbles.

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