In the late 1800s, experiments using cathode ray tubes led to the discovery of the
(1) electron
3. positron
(2) neutron
4. proton

Which position represents spring in the southern hemisphere? a) b) c) d)

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

Chemical engineering who specializes in negotiating for large purchases and instructing customers in use of the products are