Apiece of 18-carat gold was heated with a sample of nitric acid containing 63.0% of hno3 by mass and a density of 1.42 g cm-3. calculate the concentration, in mol dm-3, of hno3 in the sample.

Which of the following are correct values for the ideal gas laws constant r

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating