Need some quick , : )
the molecular masses of four substances are as follows: a = 16, b = 58, c = 86,
d = 116. which substance will have the highest boiling point?

List four observations that indicate that a chemical reaction may be taking place

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.

Element before carbon on the periodic table