A student says that since the atomic theory is just a theory, it should not be considered useful. Which statement best argues against the student’s opinion? Scientific theories change over time.
Scientific theories are the results of many experiments and observations.
Scientists often do not agree about specific details of scientific theories.
Scientists often propose competing theories.
Scientific theories do not become Scientific Laws.

Nickel crystallizes in the face-centered cubic (fcc) lattice. the density of the metal is 8902 kg/m3. calculate the radius of a nickel atom.

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.

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?