Which place describes a community? A. a desert of sand, rock, hawks, and snakes

B. the desert

C. a forest birds, insects, and squirrels

D. a hole in which a snake lives

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Displacement is the slope of a velocity vs. time graph a. true b. false

)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.