Why does a reaction slow down with time? O A. The rate constant decreases over time.
B. The reactant concentrations decrease.
C. Molecules stop reacting when they collide.
D. The exponents in the equation change.

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.