16. Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit. Discuss it with your teacher.
It's called dependence and addiction. If the use or intake of alcohol is suddenly discontinued it leads to withdrawal symptoms.
Let and be the roots of equation
is equal to:
Q.12. What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
4.30 The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.
4.29 The time required for 10% completion of a first order reaction at 298K is equal to that required for its 25% completion at 308K. If the value of A is . Calculate k at 318K and Ea.
4.27 The rate constant for the first order decomposition of is given by the following equation:
Calculate for this reaction and at what temperature will its half-period be 256 minutes?
4.26 The decomposition of hydrocarbon follows the equation . Calculate
4.25 Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, with hours. What fraction of sample of sucrose remains after 8 hours ?
4.23 The rate constant for the decomposition of hydrocarbons is at 546 K. If the energy of activation is 179.9 kJ/mol, what will be the value of pre-exponential factor.
4.22 The rate constant for the decomposition of N2O5 at various temperatures
is given below:
Draw a graph between ln k and 1/T and calculate the values of A and
. Predict the rate constant at 30° and 50°C.
4.21 The following data were obtained during the first order thermal decomposition of at a constant volume.
Calculate the rate of the reaction when total pressure is 0.65 atm.
4.20 For the decomposition of azoisopropane to hexane and nitrogen at 543K, the following data are obtained.
Calculate the rate constant.
4.19 A first order reaction takes 40 min for 30% decomposition. Calculate
4.18 For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.
4.17 During nuclear explosion, one of the products is with half-life of 28.1 years. If of was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.
4.16 The rate constant for a first order reaction is . How much time will it take to reduce the initial concentration of the reactant to its 1/16th value?
4.15 (6) The experimental data for decomposition of in gas phase at 318K are given below:
Calculate the half-life period from k and compare it with (ii).
4.15 (5) The experimental data for decomposition of in gas phase at 318K are given below:
Calculate the rate constant.
4.15 (4) The experimental data for decomposition of in gas phase at 318K are given below:
What is the rate law ?