A. Can you use mass alone to predict whether an object will sink or float?

May someone me with these science questions

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?

Nuclear decay is the spontaneous decay of one element into a. an x-ray b. a ray of light c. another element