Classify each of the following as an atom, a compound, or a molecule:
the smallest possible “piece” of gold (au)
the smallest possible “piece” of quartz (sio2)
water (h2o)
what a molecule of co2 is made of
hydrogen gas (h2)

answer; ///i believe that the correct answer is (e); check first good

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.