please help yo answer the questions from the photo above. I don\'t understand ex

Question

please help yo answer the questions from the photo above. I don't understand exergonic or endergonic.

is be? on 50. Reflect and Apply In biochemistry, the exergonic process of con- verting glucose and oxygen to carbon dioxide and water in aero- bic metabolism can be considered the reverse of photosynthesis, in which carbon dioxide and water are converted to glucose and oxygen. Do you expect both processes to be exergonic, both en- solu dergonic, or one exergonic and one endergonic Why? Would you expect both processes to take place in the same way? Why?

Explanation / Answer

The chemical equation for the (aerobic) respiration of glucose is:

C6H12O6 + 6 O2 ---> 6 CO2 + 6 H2O + ATP (energy)

6 CO2 + 6 H2O + energy (light) C6H12O6 + 6 O2 + 6

Respiration is exergonic while photosynthesis is an endergonic reaction.

Aerobic cellular respiration is exergonic because energy is released from the reaction. Cellular respiration is a catabolic pathway in which bigger molecules like glucose is break down into smaller, more stable molecules. Since glucose has more energy than the smaller molecules produced at the end of cellular respiration, there is some extra energy left over, which is then stored in ATP. The free energy change of the oxidation of a mole of glucose is -686 kcal. - G indicating the reaction is spontaneous. Consequently, the enthalpy change is negative and hence the reaction is exergonic.

Photosynthesis is an endergonic reaction. An endergonic reaction absorbs energy from its surroundings.

This is an endergonic reaction which takes energy to build these complex molecules. Oxygen is given off as a byproduct. The free energy change of formation of glucose is 686 kcal. +G indicating the reaction is nonspontaneous. Consequently, the enthalpy change is positive and hence the reaction is endergonic. Photosynthesis is a reverse process of cellular respiration.

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