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Chapter 11 Reaction Kinetics Chemistry 11th Class Punjab Short Questions

Question No. 1 - How rate of reaction is determined by electrical conductivity method?

Answer No. 1 - The rate of reaction involving ions can be studied by electrical conductivity method. The conductivity of such a solution depends upon the rate of change of concentration of the reacting ions or the ions formed during the reaction. The conductivity will be proportional to the rate of change in the concentration of such ions.

Question No. 2 - Define catalytic poisoning with example?

Answer No. 2 - Deactivation of catalyst by small amount of impurities is called catalytic poisoning.It may be temporary or permanent.
E.g. In Haber's process of CO as an impurity with hydrogen decreases the catalytic activity of catalyst

Question No. 3 - How higher temperature increase the rate of reaction?

Answer No. 3 - When we increase the temperature the average energy of the molecules increases. The number of those molecules also increase which can form an activated complex after collision. So by increasing temperature, number of effective collision increased and rate of reaction also increases.

Question No. 4 - Define and give an example of the process of activation of catalyst?

Answer No. 4 - A substance which promotes the activity of catalyst is called promoter or activator or catalyst for a catalyst.
E.g.Nickle is used as catalyst fro hydrogenation of vegetable oil and copper is used as activator.

Question No. 5 - Define negative catalyst along with an example?

Answer No. 5 - A substance which decreases the rate of reaction is called negative catalyst or inhibitor.
E.g. Tetra-ethyl is added to petrol because it control pre-ignition of petrol.

Question No. 6 - Define catalysis. Name its two types?

Answer No. 6 - The process which take place in the presence of a catalyst is called catalysis.
There are two types of it.
1. Homogeneous catalysis
2. Heterogeneous catalysis

Question No. 7 - Define Activation Energy and Activated Complex.

Answer No. 7 - The minimum amount of energy required for an effective collision is called activation energy.
Activated complex is an unstable combination of all the atoms involved
In the reaction for which the energy is maximum. It is a short lived species and decomposes into the products immediately.It has a transient existence, that is why it is also called a transition state.

Question No. 8 - How does the catalyst affect the rate of a reaction?

Answer No. 8 - A catalyst provides anew reaction path with low activation energy barriers. A greater number of molecules are able to get over the new energy barrier and reaction rate increases.

Question No. 9 - Name two Physical methods used to determine the rate of a reaction?

Answer No. 9 - 1. Spectrometry
2. Electrical conductivity method
3. Dilatometric method
4. Refractometric method

Question No. 10 - State rate of chemical reaction and give its units?

Answer No. 10 - The rate of reaction is defined as the change in concentration of reactant or a product divided by the time taken for the change.
The rate of reaction has the units of concentration divided by time,Usually the concentration is expressed in mole dm-3 And the time in second, thus the units for the reaction rates are moles dm-3s-1.

Question No. 11 - Compare order of reaction and molecularity?

Answer No. 11 - Orde:
1. The number of molecules whose concentration change in a
chemical reaction.
2. It is an experimental quantity.
3. It may be fractional.
4. It may be zero.

Question No. 12 - A final divided catalyst may prove more effective why?

Answer No. 12 - When a catalyst is finely divided, it has greater surface areas and possibilities of atoms and molecules of reactants to come in contact with each other increase and rate exchange.
E.g. CaCO3 Reacts much more rapidly in powder form, as compared to its big pieces.

Question No. 13 - Define energy of Activation. How it is affected by temperature?

Answer No. 13 - The minimum amount of energy which molecules must have in addition to their average K.E to form an activated complex is called activation energy. It is denoted by "E".
Many chemical reactions do not take place at room temperature because molecules have low K.E than the activation energy.Thus the activation energy is necessary to start a reaction.

Question No. 14 - Give two characteristics of enzyme catalyst?

Answer No. 14 - There are following characteristics of an enzyme.
1. Enzymes catalysis is highly specific.
2. Rate of enzymatic reaction is maximum at optimum
temperature and pH.
3. Enzymatic activities are enhanced by the presence of an
activator.

Question No. 15 - The radioactive decay is always first order reaction. Explain?

Answer No. 15 - The rate of radioactive decay depends on the amount of radioactive substance.Since only of substance is involved in this process therefore it is always a first order reaction.

Question No. 16 - Define instantaneous and average rate of reaction?

Answer No. 16 - Instantaneous Rate of Reaction: The rate at any one instant during a specific interval of time is called instantaneous rate of reaction.
Average Rate of Reaction: The rate of reaction between two specific intervals of time is called average rate of reaction.

Question No. 17 - What is pseudo first order reaction? Give an example.

Answer No. 17 - The rate of reaction remains effectively independence of the concentration of water because being a solvent it is present in very large excess.Such type of reactions has been named as pseudo-first order reaction.
E.g. Hydrolysis of tertiary butyl bromide.

Question No. 18 - How are enthalpy changes of reaction and energy of activation of reaction distinguished?

Answer No. 18 - Energy of Activation: The minimum amount of additional kinetic energy required by the reactants in addition to average kinetic energy for effective collisions and product formation Energy of activation.

Chapter 11 Reaction Kinetics Chemistry 11th Class Punjab Short Questions

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