What can you tell about the rate of the two reactions shown in the graph?
a.
they occurred at the same rate.
b.
one reaction started before the other.
c.
they occurred at different rates.
d.
one reaction prevented the other from 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.

Adepositional also feature that forms where a stream enters a lake or an ocean is a

Which are forms of frozen water? check all that apply. dew frost hail rain sleet