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ERIC Number: EJ1014553
Record Type: Journal
Publication Date: 2013-May
Pages: 4
Abstractor: As Provided
ISSN: ISSN-0021-9584
Energy Diagram for the Catalytic Decomposition of Hydrogen Peroxide
Tatsuoka, Tomoyuki; Koga, Nobuyoshi
Journal of Chemical Education, v90 n5 p633-636 May 2013
Drawing a schematic energy diagram for the decomposition of H[subscript 2]O[subscript 2] catalyzed by MnO[subscript 2] through a simple thermometric measurement outlined in this study is intended to integrate students' understanding of thermochemistry and kinetics of chemical reactions. The reaction enthalpy, delta[subscript r]H, is determined by a conventional thermometric method, where a modified calorimetric vessel with negligible thermal leakage is used. Thermometric curves for the reactions at different initial temperatures can be converted to different series of kinetic rate data under nonlinearly changing temperatures. The apparent activation energy, E[subscript a], is easily determined by the differential kinetic relationship at the fixed degree of reaction among the different series of kinetic rate data. By determination of both delta[subscript r]H and E[subscript a], students can draw a schematic diagram of the energy change accompanying the reaction. The laboratory activity and post lab data treatments are useful in general chemistry courses at the university or college level and also applicable in advanced chemistry courses in high schools. (Contains 4 figures and 1 table.)
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:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: High Schools; Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A