Choose whether the reaction is exothermic or endothermic 2C(s) + 2H2(g) → C2H4(9) --Select--
2H2(g) + O2(g) → 2H20() --Select--
N2(g) + 3H2(g) → 2NH3(9) --Select--

Noble gases are the most reactive elements on the periodic table. a. true b. false

Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?

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?