(a) The half-life of the first-order decay of radioactive 14C is about 5720 years. Calculate the rate constant for the reaction. (b) The natural abundance of 14C isotope is 1.1 x 10-13 mol % of living matter. Radiochemical analysis of an object obtained in an archeological excavation shows that the 14C content is 0.89 x 10-14 mol %. Calculate the age of the object and state any assumptions you make.

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.