In a classic demonstration, pepper floating on water runs away from a soapy finger. What has happened? A. Pepper is repelled by soap due to dipole forces between the molecules.
B. Soap on the finger breaks up the surface tension of the water.
C. Cohesive forces cause the water to stick to the pepper.
D. Adhesive forces cause the water at the surface to move away from the finger.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.