Nickel-63 has a half-life of 100 years. How much of a 10 gram sample remains after 400 years? A.
0.3125 grams

B.
2.5 grams

C.
1.25 grams

D.
0.625 grams

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?