Chemistry
Chemistry, 27.06.2019 15:00, QueenNerdy889

How many neutrons are in selenium -36?

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Chemistry, 10.07.2019 20:30, logan12345677885675
Plateau creek carries 5.0 m3/s of water with a selenium (se) concentration of 0.0015 mg/l a farmer starts gation, the water water is lost to the ground and plants, and the other half is returned to plateau creek. the irrigation run-off to the creek contains 1.00 mg/l of selenium. selenium is a conservative, nonreactive substance (it does not degrade in the stream), and the stream does not pick up withdrawing 1.0 m3/s of the creek water to irrigate the land. during irri- picks up selenium from the salts in the soil. one-half of the irrigation more selenium from any other source. (a) if the farmer irrigates continuously, what will be the steady-state concentration of selenium in the stream downstream from the farm (after the irrigation run-off returns to the stream)? (b) fish are sensitive to selenium levels over 0.04 mg/l. the farmer agrees not to use more water than will keep the stream selenium level below this critical concentration how much water can the farmer withdraw from the stream to use for irrigation?
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Physics, 26.07.2019 01:00, abbypark0804
Which element’s atoms have the greatest average number of neutrons? germanium (ge) arsenic (as) selenium (se) bromine (br)
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Chemistry, 10.09.2019 18:30, ike9264
Plateau creek carries 5 m3 /s of water with a selenium concentration of 0.0015 mg/l. a farmer starts withdrawing 1 m3 /s of the creek water to irrigate the land. during irrigation, the water picks up selenium from the salts in the soil. one half of the irrigation water is lost to the ground and plants and the other half is returned to plateau creek. the irrigation run off to the creek contains 1 mg/l of selenium. selenium can be treated as a conservative substance for the purposes of this problem. also assume that the stream does not pick up more selenium from any other source. a. if the farmer irrigates continuously, what will be the steady‐state concentration of selenium in the stream downstream from the farm (after the irrigation run‐off returns to the stream)? express your answer in mg/l, g/l, ppm, and ppb. b. fish are sensitive to selenium levels over 0.04 mg/l. the farmer agrees not to use more water than will keep the stream selenium levels below this critical concentration. how much water can the farmer withdraw from the stream to use for irrigation?
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