What is the concentration of an hbr solution if 29.0 ml of a 0.200 m naoh solution are needed to titrate 54.0 ml of the acid?

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids

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 anyone would be able to me out with these three questions it would be these are from the chem 2202 course.