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The LC50 is used in determining toxicity to aquatic species. It is the aqueous concentration of a test chemical that results in 50% mortality in the species during a predetermined time period. The LC50 measurde for fathead minnows, during a 96-h exposure test, is 151 mg/L for caffeine(C8H10N4O2) and 44.1 mg/L for TCE(C2Cl3H).
Is the LC50 exceeded if the aquaous concentration of caffeine is 6.2 X 10^-4 M and TCE is 4.5 X 10^-4 M?
Assume that the partition coefficient, K, for partitioning of compound A between diethyl ether and water is 3; that is, A preferentially partitions into ether.
The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol.C)
A metal, M, was converted to the chloride, MCl2. Then a solution of the chloride was treated with silver nitrate to give silver chloride crystals
15.0 moles of gas are in a 6.00 L tank at 24.1 degrees C. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constantsfor methane are a = 2.300 L^2 atm/ mol^2 and b = 0.0430 L/mol
What is the percent mass concentration of NaCl in a solution that is prepared by adding 15.0 g of NaCl to 90.00 g water? What happens to each of the following properties of a solution when the concentration of solute is decreased?
Which of the following solutions is a good buffer system? A) A solution that is 0.10 M HF and 0.10 M NaC2H3O2 B) A solution that is 0.10 M NaOH and 0.10 M KOH C) A solution that is 0.10 M HC2H3O2 and 0.10 M NaC2H3O2 D) A solution that is 0.10 M HC..
Using the standard entropy values: H2(g), S° = +130.6 J mol-1 K-1 I2(s), S° = +116.12 J mol-1 K-1 HI(g), S° = +206.0 J mol-1 K-1 calculate the standard entropy change, DeltaS°, for the reaction
In the electrolysis of KCl(aq), how many liters of Cl2(g) are formed, measured at STP, by a current of 10.0 amps for 1.5 hours. How many moles of KOH are formed in the same period
How are the opposing pathways of glycolysis and gluconeogenesis prevented from extensive
Need to have a chart of the atoms and elements, so I can tell which is which on the assignment also need to draw a picture of the atom of oxygen
Predict the sign of delta S for each of the following changes.
A solution is initially 0.050M in acetate, CH3COO- (Kb = 5.6 x 10^-10). 10.0mL of 0.10 M HCl is added. Calculate Ka for the conjugate weak acid of CH3COO-
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