The half-lifIf you start with a 256–g sample of Hassium-265, then after 8 seconds grams of Hassium-265 will be left.

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ