I need answer of this please Calculate the activity coefficients for K+ and SO4^-2 in a 0.02M solution of potassium sulfate

How many ions that have a +1 charge will bond with an ion that has a -2 charge

In which phase(s) do the molecules take the shape of the container?

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.