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CHEM 151 (35)
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Lecture 12

CHEM 151 Lecture 12: Chem 151- Unit 4 Module 3
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Department
Chemistry
Course
CHEM 151
Professor
kumirov
Semester
Spring

Description
Chemistry Unit 4 Module 3 Tracking Energy A common signature of a chemical change is the release or absorption of energy - The system absorbs energy: endothermic - The system releases energy: exothermic Energy is needed to separate a pair of bonded atoms - The energy provided is transformed into potential energy of the separated atoms. Heteronuclear bonds are stronger than homonuclear bonds (hydrogen is an exception H-H) A-A + B-B → 2 A-B (weak bonds to stronger bonds = exothermic reaction = net energy release) 2 A-B-C →
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