The quantity of oxygen that can dissolve in water depends on the temperature of the water. (So thermal pollution influences the oxygen content of water.) The graph shows how ox solubility S varies as a function of the water temperature T. (mg/L) 16- 12- 8 4. 8 16 24 32 40 T(°C) (a) What is the meaning of the derivative S (T)? O S (T) is the rate at which temperature changes with respect to the oxygen solubility. O S (T) is the rate at which oxygen solubility changes with respect to the water temperature. O S (T) is the rate at which oxygen solubility changes with respect to the oxygen solubility. O S (T) is the current level of oxygen solubility for a given temperature. O s (T) is the rate at which temperature changes with respect to the temperature. (b) Estimate the value of S '(32). (Round your answer to three decimal places.) S (32) = (mg/L)/°C

4. CHEMISTRY Boyle's Law states that when a sample of gas is kept at a constant temperature, the volume varies inversely with the pressure exerted on it. Write an equation for Boyle's Law that expresses the variation in volume V as a function of pressure P.

Level curves (isothermals) are shown for the water temperature (in °C) in Long Lake (Minnesota) in 1998 as a function of depth and time of year. Estimate the temperature in the lake on October 7 (day 280) at a depth of 5 m and on June 9 (day 160) at a depth of 10 m. X°C (day 280 and depth 5 m) X°C (day 160 and depth 10 m) Enter a number. Depth (m) 0 sti 10- 15+ 12 16 + 120 20 160 20 Day of 1998 16 200 240 280