Determine the direction of the following reaction from the relative strengths of acids and bases.

H2S(aq) + CHO2 (aq) <=> HC2H2O2(aq) + HS-(aq)

Calculate the number of molecules present in 0.750 mol of mgo.

What are the similarities of physical and chemical change ?

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?