Are useful in science because they provide a way to investigate things that are too small, large, complex, or
distant to observe or investigate directly.
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What produces wave a)sound b) heats c)transfer of energy d)vibrations

What is the mass of phosphorous in a 51-kg person

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?