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A cache of Hebrew manuscripts known as Dead Sea Scrolls was found in 1947. The activity of Carbon-14 in the linen wrappings of the Book of Isaiah was about 12 disintegration per minute per gram (d/ min*g). Calculate the approximate age of the linen.
(t1/2 of Carbon-14 is 5.73*10^3 years)
(the beta activity of Carbon-14 in living plants and in the air is constant at 15.3 d/min*g)
A canister is filled with 380g of ice and 100. g of liquid water, both at 0 C. The canister is placed in an oven until all the H2O has boiled off and the canister is empty. How much energy in calories was absorbed?
A bu?er was prepared by mixing 1.0 mole of ammonia and 1.0 mole of ammonium chloride to form an aqueous solution with a total volume of 1.00 liter.
Write three orbital designations that would be incorrect and explain why each is incorrect. For example, 1p would be an incorrect orbital designation because there is no p sub-shell in the first orbit.
determine the trend in sizes of the ions o2-n3- f- and also explain why does the trend exist? also describe which of
Fe2O3(s) + 3CO(g)-> 2Fe(s) + 3CO2(g) Based on this equation, how many moles of carbon monoxide (CO) are needed to react completely with 1.75 moles of iron (lll) oxide (FeO3)??
Given the following four substances: Bromine, Water, Carbon , and Air. Indicate whihc is expected to : 1) be a homogeneous mixture. 2) have greatest movement of particles. 3) Exist as molecules. 4) most compact arrangement of particles.
Useful data might be: change in enthalpy of melting=6.0 kj/mol; change in enthalpy of vaporization=40.6 kj/mol; cp(h2O (liquid))=75.3 J/mol K; the density of ice is 0.917 g/cm^3 and the density of water is 1.00g/cm^3.
Determine the rate constant. b. What fraction of the initial N2O5 will remain after 13.0 h? c. What is the half-life? d. If the initial concentration of N2O5 was 0.222 M, then what concentration remain after 24 h?
in 2 solutions of equal volume and mass but with solutes of different identities we learned that the solution that has
hard candy is made from very hot solutions of sugar and water with small amounts of added flavorings. in a typical
if 69.5 kj of heat is applied to a 1036 g block of metal the temperature of the metal increases by 11.4degc. calculate
A student found that her mixture was 15% NH4Cl, 20% NACL, and 75% SiO2. Assuming her calculations are correct, what did she most likely do incorrectly in her experiment?
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