What mass of ni2+ is produced in solution by passing a current of 67.0 a for a period of 12.0 h , assuming the cell is 90.0 % efficient?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *