Iron reacts with sulfur in the following process: Fe(s)+S(l)→FeS(s). If 7.5 g iron reacts with 9.1 g sulfur, what is the excess reagent and how much of that reagent is left at the end of the reaction?

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?