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What is the decay constant for iodine-131? It decays by beta emission with a half-life of 8.04 days.
A. 1.24*10^-1/day
B. 3.35*10^-1/h
C. 5.18*10^-3/h
D. 5.99*10^-5/min
E. 1.44*10^-6/s
a 10.00g sample of toothpaste contaning stannous fluoride gives0.145g precipitate of stannous phosphate.what is the percentage of snf2 in the toothpast sample.
Hydrochloric acid reacts with zinc metal to form zinc chloride and hydrogen gas. If 345.2 g of zinc metal reacts with 231.6 grams of acid. How many liters of hydrogen gas are produced? How many moles of zinc chloride are produced?
Calculate the change in internal energy of the following system: a balloon is cooled by removing 0.651kJ of heat. It shrinks on cooling, and the atmosphere does 384J of work on the balloon.
A 100. mL sample of 0.10 M HCl is mixed with 50. mL of 0.12 M NH3. What is the resulting pH?(kB FOR NH3= 1.8 x 10^-5)
Hydrogen cyanide (and organic nitriles, which contain the cyano group) can be catalytically reduced with hydrogen to form amines
calculate the approximate volume of a 0.600 mol sample of gas at 15.0 degrees Celcius and a pressure of 1.10 atm.
you are taking a walk when a bid mean dog growls and begins to chase you. The increased epinephrine will increase? a glycolysis in the liver b glycolysis in the muscle
A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each photon to the result of its absorption
A 2.5L bottle of concentrated sulfuric acid H2SO4 (16M) falls and breaks on the floor. What mass of NaHCO3 would be required to neutralize this acid spill through the following reaction HCO3 + H => H2O +CO2
If a solution containing 48.91 g of mercury(II) acetate is allowed to react completely with a solution containing 7.410 g of sodium sulifide how many grams of a solid precipitate will be formed?
Calcium reacts with iodine z=53. If a sample of the compound formed contains 7.4x10^21 calcium ions, how many iodine ions does it contain.
A 2kg iron bar (c of iron is 440 J.kg .K) is heated to 80 Celsius. The bar is dipped in 5kg of water at 20 Celsius in a heat insulated container. What will be the equilibrium temperature inside the container?
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