Express each aqueous concentration in the unit indicated. a). 25 mg of trichloroethylene in 9.5 l of water, as ppb of trichloroethylene b). 38 g cl2 in 1.00x 104 l of water, as ppm cl2 c). 2.4 ppm f -, as molarity of fluoride ion, in [mol f - /l] d). 45 ppm no3 -, as molarity of nitrate ion in [mol no3 - /l] e). why do some scientists prefer to express concentrations of water contaminants in the units ppm and ppb rather than molarity

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

What is the formula for the compound dinitrogen pentoxide? a. n4o5 b. n5o4 c. n4o6 d. n5o2 e. n2o5

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.