If you have 25 g. of a sample that has undergone 4 Half-Lives, how much sample did you have at
the beginning?

Why does a cake rise when you bake it? ♡

Nonpoint source pollution is difficult to control because it

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.