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Postby Meachelle_Lum_1I » Fri Jan 18, 2019 3:33 pm

For 11.87 in the 6th edition, the textbook states that X2 (g) —->2X (g) is an endothermic reaction since it takes heat to break the molecules of gas apart.

However, I thought catabolic (breaking down) reactions were exergonic?

Letizia Ye 4F
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Re: Endothermic

Postby Letizia Ye 4F » Fri Jan 18, 2019 4:30 pm

Energy is required for bonds to break, and in the decomposition of halogens more energy is used to break the bond than released in the formation of the products. Thus the overall reaction is endothermic.

Jerome Mercado 2J
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Re: Endothermic

Postby Jerome Mercado 2J » Fri Jan 18, 2019 4:40 pm

The process is endothermic since it requires energy therefore essentially absorbing energy. It may use energy to break a bond which may release some energy but the whole process has a net gain of energy. When you look at a free energy graph of reactants and products of an endergonic reaction, you may see a long slope into a peak but heads back down just a little to create the products. The energy in your example is used as activation energy.

Here is a good picture of the process: https://en.wikipedia.org/wiki/Endergoni ... action.svg

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