Parts per million (ppm) is a common way to express small concentrations of a solute in water. a sample of tap water that is 25 ppm cl−cl− contains 25 grams of cl−cl− for every 1,000,000 grams of water. which units are numerically equal to ppm for dilute aqueous solutions?

a. μg/l
b. cg/l
c. ng/l
d. mg/l
e. g/l

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this