According to le chateliers principle when a change is introduced into a system in chemical equilibrium the equilibrium shifts. a) to the forward reaction. b) to the reverse reaction c) in the direction that relieves the change d) in the direction that requires the most energy

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust

)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.