How do you find the half life of (Uranium) U-238? using the graph above.

10. translate each of the following chemical equations into a sentence. a. 2 zns(s) + 3 o2(g) -> 2 zno(s) + 2 so2(g) b. cah2(s) + 2 h2o(l) -> ca(oh)2 (aq) + 2 h2(g)

Freya built a model of the earth, sun, and moon. freya can cause her model to move in three different ways. she can turn the crank to model how the earth revolves around the sun, she can spin the globe to model how the earth rotates on its axis, and she can push the moon with her fingers to model how the moon revolves around the earth. how could freya best use her model to demonstrate the cause of the day/night cycle on earth?

The osmotic pressure exerted by a solution is equal to the molarity multiplied by the absolute temperature and the gas constant r. suppose the osmotic pressure of a certain solution is measured to be 12.atm at an absolute temperature of 317k. write an equation that will let you calculate the molarity c of this solution. your equation should contain only symbols. be sure you define each symbol other than r. equation: c=? definition of symbols: ? = 12 atm ? = 317 k