Sunday, 26 April 2020

1st year Chemistry Chapter 11 Short Questions Notes

1st year Chemistry Chapter 11 Short Questions Notes
Looking for the 11th class Chemistry Chapter 11 Chemical Kinetics notes? Here we have shared the 1st year Chemistry Chapter 11 Short Questions Notes.

02. The rate of a chemical reaction is the ever-changing parameter under a given condition. Justify it.
 The rate of a chemical reaction is directly proportional to the concentration of reactants. As the reaction precedes the concentration of reactants decreases so the rate of reaction also decreases. The rate is maximum at beginning and minimum at the end of the reaction.
 03. The reaction rate decreases every moment but the rate constant “k” is a constant quantity under the given conditions. Explain.
 The rate of reaction depends upon the concentration of reactants which changes every moment so the rate also changes. But the rate constant “k” is equal to the rate of reaction when the concentration of reactants is one.
 A + B ------> C + D
 Rate = k [A] [B]
 04. 50% of a hypothetical first-order reaction completes in one hour. The remaining 50% need more than one hour to complete. Explain.
 The concentration of reactants decreases with the passage of time. The half-life period of the first-order reaction is independent of initial concentration. If the initial concentration is “a” then after the half-life period “a/2” concentration remains. And after the next half-life period, “a/4” concentration remains.
 05. The radioactive decay is a first-order reaction. Explain.
 The radioactive decay is directly proportional to the number of nuclei in the sample. It is the first-order reaction because in the first-order reaction rate of reaction depends upon the concentration of only one reactant or unstable isotope which decays at that time.

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