What did rutherford's gold-foil experiment him conclude?
a. the mass of the atom is equivalent to the number of protons alone.
b. the mass of the atom is negligible.
c. the mass of the atom is mostly located in a small nucleus.
d. the mass of the atom is equivalent to the number of neutrons alone.

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

)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.

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.