Inside a fuel cell, hydrogen is converted into H+ ions. These ions combine with oxygen to produce energy for the car and water as exhaust. Describe how the fuel cell obeys the law of conservation of mass.

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?