Chemistry Chapter 7 Short Questions For Class 11

Last Updated on June 10, 2026 by Ahsa.Pk

The most important Chemistry chapter 7 short questions for Class 11. The 1st-year chapter 7 of Chemistry is related to thermochemistry. These questions are for the Punjab Textbook Board and can be used within all of Punjab where this syllabus is taught.

Students are advised to prepare these questions in order to perform the best in the board examination.

Chemistry Chapter 7 — Reaction Kinetics Short Questions for Class 11

What do you understand by the rate of a reaction?
Give the difference between the enthalpy change of reaction and the energy of activation of reaction.
Differentiate clearly between order and molecularity of a reaction.
Why does the instantaneous rate change during a reaction?
Briefly summarize the effects of temperature and surface area on the rates of reactions.
Justify that radioactive decay is always a first-order reaction.
A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration is doubled and reduced to half?
What is meant by “half-life,” and what is it used for?
Why does wood burn more rapidly in pure oxygen than in air?
A catalyst lowers the activation energy of a chemical reaction. Illustrate it.
The rate constant for a certain reaction is 3.5×10⁻⁴ s⁻¹ at 25°C. What is the order of the reaction? Explain based on the units of the rate constant.
If the initial concentration of the reactant is 0.50 mol dm⁻³, calculate the initial rate of the reaction.
How would the rate of this reaction change if the concentration of the reactant were doubled?
A certain first-order reaction has a rate constant of 2.5×10⁻³ s⁻¹. Calculate the half-life of the reaction in minutes.
A radioactive isotope decays by a first-order process with a half-life of 12 hours. Calculate the rate constant for the decay in s⁻¹.
Differentiate between instantaneous and average rates of reaction.
Differentiate between the rate and rate constant of a reaction.
Radioactive decay is always a first-order reaction. Justify.
What is a zero-order reaction? Give one example.
The order of reaction may be a fraction. Explain.
Differentiate between order of reaction and rate of reaction.
Define the half-life period of a reaction. Give one example.
What is the rate-determining step? Give a suitable example.
Differentiate between a fast step and the rate-determining step.
The sum of the coefficients of a balanced chemical equation is not necessarily important to give the order of reaction. Give reasons in support of your answer.
Define energy of activation. How is it affected by temperature?
Describe the half-life method to determine the order of reaction.
Define catalysis. Write two characteristics of a catalyst.
Define catalysis. Give its different types, with one example in each case.
Differentiate between homogeneous and heterogeneous catalysis. Give an example.
Describe the effects of a catalyst on a reversible reaction.