Cesium-137 is a radioactive byproduct of the fission process. Much Cesium-137 was deposited in the Bikini Atoll (in the Southwestern Pacific Ocean) during atomic bomb tests of the 1940s. How many years will it take 128-grams of Cesium-137 to decay to only 4-grams of Cesium-137 if its half-life is 30 years?

Under what conditions will a gas be most likely to exhibit the ideal gas properties predicted by the ideal gas law? 1)high pressures and high temperature, because particles are forced closer together with higher kinetic energy, so intermolecular forces of attraction are weaker 2)high pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant 3) low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker 4)low pressure and low temperature, because particles are spread farther apart with lower kinetic energy, so the volume of the particles is less significant