During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released. If the reaction equation is: 2H (g) -> H2 (g) Is this reaction exothermic or endothermic? Use ideas about bonds to explain why.

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter9: Chemical Bonds
Section: Chapter Questions
Problem 9.21QE
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During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released. If the reaction equation is:

2H (g) -> H2 (g)

Is this reaction exothermic or endothermic? Use ideas about bonds to explain why.

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