If you burn a piece of wood you will feel heat see water vapor and be left with ashes how come the matter was not destroyed

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.

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

What is the molecular weight of copper