Uranium-238 decays to lead-206 with a half-life of 4.5 x 109 yr. determine how much uranium-238 decays in milligrams (to three significant figures) if a 4.60 mg sample of uranium-238 decays for 4.1 x 109 yr.

Which position represents spring in the southern hemisphere? a) b) c) d)

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Phosgene (carbonyl chloride), cocl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures: co(g) cl2(g)⇌cocl2(g) carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 477 ∘c . at equilibrium, the concentrations were measured and the following results obtained: gas partial pressure (atm) co 0.830 cl2 1.30 cocl2 0.220 what is the equilibrium constant, kp, of this reaction