Which substance would you expect to dissolve most rapidly in 100 mL water? A
0.4 g granulated sugar

B
0.2 g powdered sugar

C
0.4 g powdered sugar

D
0.2 g sugar cube

b because it is just 0.2 g and powdered sugar has more contact surface than granulated sugar or sugar cube

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.