Which statement describes one feature of a mineral's definite chemical composition? O lt always occurs in pure form.
Olt always contains certain elements.
O lt cannot form from living or once-living materials.
O It cannot contain atoms from more than one element.

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?