Will a precipitate form when each of the following pairs of solutions is mixed? If so, give the formula of the precipitate, and write the net ionic equation for the reaction. a) Barium hydroxide + potassium carbonate b) Ammonium chloride + silver nitrate c) Sodium sulfate + aluminum chloride

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.