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examples of endergonic and exergonic reactions

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Question:I'm very confused. I thought that exergonic reactions didn't need energy to go; they were spontaneous. Yet they still have to overcome an activation energy barrier. What's the difference between activation energy and the energy required to run an endergonic reaction? I appreciate the help; I really want to understand this.

Answers:The energy required to start a "spontaneous" exergonic reaction is much less than the energy needed to start an endergonic reaction. Once this small amount of activation energy is put in THEN the exergonic reaction becomes spontaneous and continues by itself, whereas energy needs to be constantly applied during an endergonic reaction. For example, burning gas is exergonic - you need a spark, a tiny amount of activation energy, and then the gas will burn on its own releasing much more energy. Gas doesn't just light itself.

Question:The hydrolysis of sucrose to glucose and fructose is exergonic. However, if sucrose is dissolved in water and the solution is kept overnight at room temperature, there is no detectable conversion to glucose and fructose. Why? Here are the choices: A. The change in free energy of the reaction is positive. B. The activation energy of the reaction is high. C. The change in free energy of the reaction is negative. D. This is a condensation reaction. E. The free energy of the products is higher than the free energy of the reactants

Answers:SINCE THE REACTION SHOULD GO SPONTANIEOUSLY DUE TO THE FACT THAT THE PRODUCTS HAVE A LOWERE FREE ENERGY THAN THE REACTANTS, THE ACTIVATION ENERGY HAS NOT BEEN MET. ADDING AN ENZYME WILL LOWER THE REQUIRED ACTIVATION ENERGY For this reaction, Free energy and chemical equilibrium This chemical reaction can run in both the forward and reverse directions, but the products glucose and fructose are at a lower energy level than the reactant sucrose. The difference between a spontaneous and nonspontaneous reaction can be distinguished by the following relationships: Spontaneous Reaction Nonspontaneous Reaction Keq > 1 Keq < 1 G < 0 G > 0 Exergonic Endergonic Forward reaction favored Reverse reaction favored The hydrolysis of sucrose This is a spontaneous reaction beginning with sucrose because Keq > 1.

Question:A)The reaction requires the input of free energy. B)The free energy of glucose is larger than the free energy of maltose. C)The reaction is not spontaneous. D)The reaction releases free energy. E)At equilibrium, the concentration of maltose is higher than the concentration of glucose.

Answers:D exergonic reactions release more energy than they use (think energy exits) endergonic reactions use more energy than they release

Question:can anyone list types of chemical reactions you encounter every day? and can you indicate if they are endergonic or exergonic? i am having trouble trying to remember the difference. so im just looking for a few examples to help me remember.

Answers:Cooking is usually endergonic; using a car is mostly exergonic. What's hard? Endergonic reactions take in energy; exergonic reactions release energy...

From Youtube

8. Energy and cells - Respiration 1 of 3 :This video looks at the realtionship between exergonic (catabolic) and endergonic (anabolic) reactions, the atp/adp cycle, and introduces aerobic respiration and the three main stages of this.

The ATP Cycle :Energy in cells are accounted for through metabolic processes, which store and produce the energy. One of these metabolic processes is known as the ATP cyle. The ATP cycle is how ATP and ADP are produced in cells. ATP, also known as Adenosine Triphosphate, contains one adenosine molecule and three phosphate groups. ADP or Adenosine Diphosphate also contains one adenosine molecule, but contains two phosphate groups. Dephosphorylation is the process that makes ADP. It removes one of the phosphate groups from ATP, therefore ADP only has two phosphate groups. Dephosphorylation gives off energy, which is why it is known as an exergonic reaction. The energy given off by dephosphorylation is used for many functions in the cell, like many enzymatic reactions. There are also functions in the cell that require energy. ATP is made by a process called phosphorylation, which is what adds a phosphate group to make ATP. Phosphorylation is an endergonic reaction, which requires energy. The energy used to phosphorylate ATP may come out of the oxidation of carbohydrates. Active transport is another example of an energy-consuming process in the cell. The energy stored in ATP provides the universal energy for cells to function.