Unknown (Lake Water) Lead Concentration. Using the analysis values above, calculate the lead ppb via,

Choose from the list below the system properties that can change only with time: a) Density, b) Pressure, c) Energy, d) Specific volume, e) Volume , f) Mass, g) Temperature.

O THERMOCHEMISTRY Understanding the definitions of heat and work 15 ARLYC A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. (See sketch at right.) 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to absorb 393. kJ of energy. water bath The position of the piston is monitored, and it is determined from this data that the piston does 194. kJ of work on the system during the reaction. gases O exothermic Is the reaction exothermic or endothermic? O endothermic O up Does the temperature of the water bath go up or down? O down O neither O in Does the piston move in or out? O out O neither O in Does heat flow into or out of the gas mixture? O out O neither How much heat flows? Be sure your answer has the correct…