(will give first correct answer ) which option correctly describes glucose catabolism? 1. glucose is broken down in glycolysis, yielding two atp molecules; after the krebs cycle, 34 molecules of atp are formed in ets reactions. 2. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, two molecules of atp are formed in ets reactions. 3. glucose is broken down in glycolysis, yielding two atp; after the krebs cycle, nadh and fadh2 are formed, yielding nad+ and fad in ets reactions. 4. glucose is broken down in glycolysis, yielding pyruvic acid; after the krebs cycle, nadh and fadh2 are formed, yielding 34 adp in ets reactions.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.