You find a mysterious rock on the ground and determine that 60%% of its uranium-235 has been converted into lead-207. What is the most likely origin of the rock, based on its radiometric age?

Review the branily terms and services guides well u know what i never did so go have a nice ice cream sunday

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?