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Threshold / NOEL Levels of Chemical Toxins
The threshold/NOEL level found for a particular chemical from animal studies is 0.006 mg/kg body weight per day. The only source for the chemical is freshwater fish, where it occurs at an average level of 0.2 ppm. What is the maximum average daily consumption(g) of such fish that would keep exposure level below the ADI or RfD for the compound?
At 25 degree celcius ,the second order reaction NOCL(g) - NO (g) + 1/2 CL2 (g) is 50 % complete after 5.82 hours when the initial concentration of Nitrosyl chloride is 4.46 ml/L.what time will it take for the reaction to be 75 % complete.
A mixture of sand and iron pieces weighs 53.29 g. Using a magnet, the iron is removed and weighs 15.63 g. What is the percent composition of sand in the mixture?
A molecule of N2 in air travels at about 1000 ft/sec. If the supersonic transport Concorde travels at 1500 miles/hour, how fast does it travel in ft/sec? (1 mile = 5280 ft)
A compound with empirical formula C 2 H 2 N dissolved its 0.0800 gram in 10.00 g of C 6 H 6 , freezing point of resulting solution= 4.99 degree celsius
Calculate the probability of finding an electron that is described by this wavefunction in a volume of 1.0 pm3 (i) centred on the nucleus.
Solutions of sodium carbonate and silver (I) nitrate react to form solid silver (I) carbonate and a solution of sodium nitrate.
Drag the flask and drop it on the lower half of the burette to connect them. Open the Data window and click on the flask. Click the Pushpin icon in the blue bar of the Data window to lock its display to the flask's contents.
If 25.0 mL of AgNO3 is needed to precipitate all the Cl- ions in a 0.795 mg sample of KCl(forming AgCl), what is the molarity of the AgNO3 solution.
If the methane contained in 3.00 L of a saturated solution at 25 was extracted and placed under STP conditions, what volume would it occupy.
Explain why a mercury-in-glass thermometer with a uniform-bore capillary that is correct at 0 celsius and 100 celsius read 49.9 celsius when the temperature is actually 50 celsius.
3H2 + N2 -> 2NH3. At 200 degrees C in a closed container, 1.00atm of nitrogen gas is mixed with 2.00atm of hydrogen gas. At equilibrium, the total partial pressure is 2.00atm.
A 1 L solution of 1.5 M acetic acid and 1.5 M sodium acetate has a ph of 4.74. 10 ml of 0.1 M NaOH were added to the solution followed by the addition of 50 ml of 0.02 M HCl.
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