The temperature at 12 noon was `10^oC` above zero. If it decreases at the rate of `2^oC` per hour until midnight, at what time would the temperature be `8^oC` below zero? What would be the teperature at midnight?

A certain freezing prosess requires that room temperature be lowered from 40^oC at the rate of 5^oC every hour. What will be the room temperature 10 hours after the process begins?

A what temperature, the rate of effusion of N_(2) would be 1.625 times that of SO_(2) at 50^(@)C ?

In general it is observed that the rate of a chemical reaction doubles with every 10 degree rise in temperature. If the generalization holds good for the reaction in the temperature range 295 K to 305 K, what would be the value of activation energy for this reaction ? [R = 8.314 mol^(-1)JK^(-1)]

Two narrow bores of diameters 3.00mm and 6.0mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube? Surface tension of water at the temperature of the experiment is 7.3 times 10^-2 N m^-1 .Take the angle of contact to be zero and density to water to be 1.0 times 10^3 kg m^-3

Ethylene bromide C_(2)H_(4)Br_(2) , and 1,2 -dibromopropane, C_(3)H_(6)Br_(2) ,form a series of ideal solutions over the whole range of composition. At 85^(@)C , the vapour pressure of these two pure liquids are 173 and 127 torr, respectively. . If 10.0 g of ethylene bromide is dissolved in 80.0 g of 1,2-dibromopropane, calculate the partial pressure of each component and teh total pressure of the solution at 85^(@)C . b. Calculate the mole fraction of ethylene bromide in the vapour in equilibrium with the above solution. c. What would be the mole fraction of ethylene bromide in a solution at 85^(@)C equilibrated with a 50 : 50 mole mixture in the vapour?

What is the excess pressure inside a bubble of soap solution of radius 5.00 mm. given that the surface tension of soap solution at the temperature (20^@C) is 2.50 times 10^-2 N m^-1 ? If an air bubble of the same dimension were formed at depth of 40.0 cm inside a container the soap solution (of relative density 1.20] what would be the pressure inside the bubble?[1 atmospheric pressure is 1.01 times 10^5 Pa ).

Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases. {:("Gases",H_(2),He,O_(2), N_(2)),("Critical temperature in Kelvin",33.2,5.3,154.3,126):} From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first.

A student forgot to add the reaction mixture to the round bottomed flask at 27@ C but put it on the flame.After a lapse of time,he realised his mistake.By using a pyrometer,he found that the temperature of the flame was 477^@C . What fraction of air would have been expelled out?(2+3)

The lower end of a capillary tube of diameter 2.00mm is dipped 8.00cm below the surface of water in a beaker. What is the pressure required in the tube in order to blow a hemispherical bubble at its end in water? The surface tension of water at temperature of the experiments is 7.30 times 10^2 Nm^-1 .1 atmospheric pressure =1.01 times 10^5 Pa density of water =1000 kg//m^3,g=9.80 ms^-2 . Also calculate the excess pressure.