Thermal energy is flowing from the 1) to the 2). This flow of thermal energy is a system 3).

If 90.0 grams of ethane reacted with excess chlorine, how many grams of dicarbon hexachloride would form

Which compound contain an iron with a 3+ charge

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?