Which statement is true for a cooling curve? a.) it shows how the temperature of the substance falls as heat is removed. b.) it shows how the temperature of the substance changes when heat is applied. c.) it shows the increase in the average kinetic energy of the particles. d.)it shows how heat absorption affects the motion of particles. e.) it shows how energy gain causes the temperature to fall.

)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.

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1

A0.100-kilogram apple hangs in a tree 1.50 meter above the ground. ignore frictional effects, the total mechanical energy of the apples is