Small pieces of copper at 100.0°C are placed in 110.0g of water at 25.0°C in a perfectly insulated calorimeter. The water and copper reach the same final temperature. The initial and final temperatures of the water are shown. The heat capacity of water is 4.18J/(g⋅°C). How much heat is transferred during the experiment?

A 220J

B 230J

C 460J

D 920J

920J

D

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.