The rock in the image is marble, which has many layers and is extremely hard. it was formed under high heat and pressure. marble is an example of rock changing rock.

)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.

How do you know when a chemical reaction has occurred

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next