An atom’s emission of light with a specific amount of energy confirms that atoms must have a dense central mass surrounded by electrons at a distance. electrons emit and absorb energy based on their position around the nucleus. electrons can only be found within predicted areas surrounding the nucleus. atoms are made of positive and negative charges.

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.