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Use effective half-life found in part (a) to find out percentage of radioactive iodine remaining in human thyroid gland five weeks after its ingestion.
A pharmaceutical drug, Lipitor that has been shown to lower "bad" cholesterol levels while raising the"good" cholesterol levels in the patients taking the drug, had over $11 billion in sales in 2006
A gas sample is a mixture of butane and ethane. A bulb having 215.0 cm3 capacities to a pressure of 108.5 x103 Pa is filled with the gas at 19.2 degrees Celsius.
Explain how you would go about finding the number of "chalk molecules "it takes to write your name on the board?
Assume that 1¢ is deposited in the savings account paying 1% annual interest compounded continuously. How much money will have accrued in account after 2000 years?
In a titration the following data were collected. A 10. mL portion of an unknown monophonic acid solution was titrated with the 1.0 M NaOH; 40.mL of the base were needed to neutralize the samp
At last, mix of no Dumbium, 4 cc of Sillium, 3 cc of Deludium and 4 cc of Ignorium weighed 41.2 gms. Provided all this find weight of pure Deludium per cc, correct to nearest tenth of a gm/cc?
Calculate if the heat of solution is endothermic and exothermic from the magnitude of the lattice energy and the hydration energy and vice versa and define the difference among the hydration energy
Determine how are Elements and compounds, protons, electrons, , Neutrons, mass number and Atomic number, radioactive and the Isotopes are related under the structure and the bonding sub topics? &n
If Epsom salt, MgSO4, H2O, is heated to 250degrees C, all the water of hydration is lost.0.824g of MgSO4remains, on heating a 1.687-g sample of the hydrate. Determine how many molecules of wat
Determine number of bacteria present in culture after7 hours. Determine time that it takes culture to grow to20 times its initial size.
Ascorbic acid, Vitamin C is a water-soluble vitamin. At 55 C a solution having the 80.5 g of ascorbic acid dissolved in the 210 g of water has a density of 1.22 g/ml.
With a volume of 59.7ml a metal slug weighing 25.17g is added to a flask. It is found that to fill the glass the 43.7g of methanol (d=0.791g/ml) must be added to the metal. Discuss the
At 20oC the solubility of barium hydroxide in water is1.85g/100g water and the solution is made up in 35.0g of water of 256mg. Explain, Is the solution saturated? If not, determine the number of ba
Determine values of trigonometric functions of angle (in standard position) whose terminal side passes through given point. Coordinates are approximate. (37.71,21.86)
Determine the binding energy of the nucleus of56Fe, given that the proton mass = 1.00728 amu, the isotopic mass is 55.92068 amu and the neutron mass= 1.00866 amu. Answer in joules to two sig figs.
To create the same antifreeze protection as 3.00 gallons of ethylene glycol, determine the volume of propylene glycol in gallons.
The CCL3F and CCl2F2 have been linked to ozone depletion in the Antarctica. As of 1994 these gases were found in quantities of 261 and 509 parts per trillion by volume.
Determine excact value of expression cos (a+B), sin (a+B) and tan (a+B) under the given conditions. cos (a) = 15/17, a lies in quadrant IV, and sin (B) = -6/13, B lies in quadrant III.
Compute amplitude, perod and displacement of given function. y = 2 cos (x - pi/6). Find amplitude, perod and displacement of given function. y = -5 cos (2x - pi/2)
Draw graph of the following. Define period and midline 1) y= 3sin 2t 2) y= -cos1/2 t. Compute coordinates of point at given angle on the circle with radius 3.8 centered at origin. a) 45°
Determine the formula for Cos(4theta) in terms of Cos{Theta}. Suppose that V is in interval (-pi/2, 0)...Tan V=-1/12 find sin(2V)
Write down equation in standard form of conic with given characteristics. parabola: vertex (3,-3) and focus (3, -9/4) ellipse: center (2,-1), vertex (2, 1/2), length of minor axis: 2.
The initial invesment of $14000 is appreciated for 5 years in the account which earns 14% interest, compounded semiannually. Determine amount of money in account at the end of the period.
There is linear relationship between number of units, N(x), of the product which the company sells and amount of money, x, spent on advertising. Write interpretations of slope and x- and y- intercep