A binary number uses only two digits zero and one. In a binary system, numbers are represented as follows
|NUMBER AS INTEGER||NUMBER IN BINARY|
Ever observed an old glass window? It will be thicker at the base than the top. This shows that glass flows(at a very slow rate) and it can flow because it is amorphous.
3.20 b) Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (iii) 6 Ω
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Question 6. Let ∗ be the binary operation on N given by a ∗ b = L.C.M. of a and b. Find
(v) Which elements of N are invertible for the operation ∗?
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.
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.
4.28 The decomposition of A into product has value of k as at 10°Cand energy of activation 60 kJ mol–1. At what temperature would k be ?
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?
4.25 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 ?
4.24 Consider a certain reaction A Products with . Calculatethe concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol
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.
4.18 For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.