If you had a cup of salt water, could you get the salt out by pouring it through a cloth?

I'm just trying to figure something out and my brain is deciding to malfunction. I'm hoping this can help organize things. You know, maybe.

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.

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

How does concentration affect reaction rate