Select all the correct answers. Which equations represent precipitation reactions? (There is more than one correct answer)

Na2S + FeBr2 → 2NaBr + FeS

MgSO4 + CaCl2 → MgCl2 + CaSO4

LiOH + NH4I → LiI + NH4OH

2NaCl + K2S → Na2S + 2KCl

AgNO3 + NaCl → AgCl + NaNO3

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

i think slash and

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