ERIC Number: EJ1195680
Record Type: Journal
Publication Date: 2018-Sep
Pages: 7
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0021-9584
EISSN: N/A
Trends in Bond Dissociation Energies for the Homolytic Cleavage of Successive Molecular Bonds
Donnelly, Julie; Hernández, Florencio E.
Journal of Chemical Education, v95 n9 p1672-1678 Sep 2018
The students in our physical chemistry course pointed out an interesting trend in the bond dissociation energies (BDEs) of successive homolytic cleavages of hydrogens from methane and water. Namely, while there is an increase in BDE from CH[subscript 4] to CH[subscript 3], there is a decrease in BDE from H[subscript 2]O to OH. In order to explain this trend, we employed a theoretical approach that could be used in an undergraduate setting. We compare our theoretical results with experimental and highly accurate theoretical values readily available in the literature. Having validated our theoretical approach, we use equilibrium molecular structure as evidence of the change in dominating attraction and repulsion effects of the central atom nucleus and nonbonding electrons and explain the anomaly in BDEs in undergraduate chemistry terms.
Descriptors: Chemistry, Science Instruction, Scientific Concepts, Undergraduate Students, Molecular Structure, College Science
Division of Chemical Education, Inc. and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: eic@jce.acs.org; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A