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A new method for the determination of mercury in oyster tissue is compared with NIST SRM 1566B (Oyster tissue). The NIST standard is said to contain 0.0371 mg/kg mercury in oyster tissue. Five replicates through the new method gave a mercury content of 42 ppb with a standard deviation of 2 ppb.
Perform a t-test at the 95% confidence level to determine if the new method contains bias.
What is the calculated value of t for the new method (to two sig. figs)?
What is the critical value of t (to two sig. figs)?
Does the new method contain bias at the 95% confidence level?
Determine the mass of sodium phosphate that yields 1.00 g of calcium phosphate precipitate.
What is the mass change (in grams) accompanying the formation of CO and H2 in the water gas reaction?
If 8.8 mg of iodine-123 is used in an experiment, how many milligrams of iodine-123 should remain after 50 hours? Assume that iodine-123 has a half-life of 10 hours.
The equilibrium constant Kc for this reaction is 1.2 102 at 150°C. What is the direction (forward or reverse) needed to attain equilibrium at 150°C
Orange juice is an aqueous solution that derives much of it's acidity from citric acid. There are variations in the acidity of each brand depending on many factors
compound p binds with x to form the complex px. a series of solutions was prepared with the total p concentration
Explain, using kinetic Theory, why balloons sink in cold air, and how perfumes can permate the air in a room over time.
A voltaic cell consists of a half-cell and a half-cell at 25 . The initial concentrations of and are 5.10×10-2 and 1.40 , respectively.
A 25.0 mL sample of 0.400 M NH3(aq) is titrated with 0.400 M HCl(aq). What is the pH at the equivalence point. (Kb of NH3 = 1.8 ´ 10-5)
The human body obtains 1091 kJ from a candy bar. If this energy were used to vaporize water at 100°C, how much water in liters could be vaporized? (Assume that the density of water is 1.0 g/mL.)
A sample of gas with a mass of 6.87g occupies 3.25L at STP. What is the molecular weight?
Choose the selection which correctly characterizes all three of the following substances in terms of whether they are polar or nonpolar
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