Oriana touches a positively charged metal plate to a neutral metal sphere. How does the charge of the metal
sphere change?
It has an excess of positive charge.
It has an excess of negative charge.
It has a negative charge inside of the sphere,
It has a positive charge inside of the sphere.

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

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.

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter