If the concentration of mercury in water of a polluted lake is 0.33 μg (micrograms) per liter of water, what is the total mass of mercury in the lake, in kilograms, if the lake has a surface area of 10.0 km^2 and an average depth of 15 m? (1 kg = 10^9 μg)

Which statement best describes how atoms combine to form sodium chloride (nacl)? a. a positively charged sodium ion and a positively charged chlorine ion form an covalent bond. b. a positively charged sodium ion and a negatively charged chlorine ion form an covalent bond. c. a positively charged sodium ion and a positively charged chlorine ion form an ionic bond. d. a positively charged sodium ion and a negatively charged chlorine ion form an ionic bond.

What is the number of atoms in 3.54 mol s

Which of the following steps is not likely to take place during cellular respiration? (5 points) select one: a. oxygen combines with carbon of simple sugar. b. energy molecule transfers energy to cells. c. simple sugar breaks down. d. energy is used up.