Which compound is an isomer of ch3ch2oh

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.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Chemistry worksheet - i am not sure what they are asking for exactly?