The density of a 100 g sample of lead is approximately 11 g/CM3. If the sample is cut into two 50-g pieces, what is the density of each half? Help please

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.