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environmental chemistry

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Are these endothermic or exothermic?
A) cracking large hydrocarbon molecules
B) digesting a candy bar

I don't get these. Could someone help me and explain why they are endo or exothermic?

  • environmental chemistry - ,

    a. breaking large hydrocarbon molecules is definitely endothermic, usually the heat is supplied from a superheated catalyst.
    b. digesting a candy bar? exothermic. ATP is given off in cell processes (Krebs cycle and electron transport cycle).

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