A container hold 3 gases: oxygen, carbon, dioxide, and helium. The partial pressure for two of the gases are oxygen: 3.00 atm and carbon dioxide: 4.00 atm. If the total pressure in the container is 20 atm what is the partial pressure of helium.​

Fission of uranium-235 products energy and a. isotopes of smaller elements b. isotopes of larger elements c. lighter isotopes of uranium d. heavier isotopes of uranium

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.

The identities of substances are the same before and after which type of change