Touch-Initiated Reaction of Nitrogen Triiodide as a Template for Activation Energy Classroom Discussions

Touch-Initiated Reaction of Nitrogen Triiodide as a Template for Activation Energy Classroom Discussions

Activation energies form an energy barrier to a chemical reaction taking place. Simple collision theory, i.e. that particles need to collide to react, would suggest that activation energy is the energy needed to overcome a coulombic barrier provided by the negatively charged electrons contained with...

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Bibliographic Details
Published in:School science review Vol. 98; no. 364; pp. 41 - 46
Main Author: Short, Duncan
Format: Journal Article
Language:English
Published: Association for Science Education 01-03-2017
Subjects:
Barriers
Chemistry
Computation
Demonstrations (Educational)
Energy
Molecular Structure
Science Instruction
Scientific Concepts
Thermodynamics
Online Access:Get more information
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Summary:Activation energies form an energy barrier to a chemical reaction taking place. Simple collision theory, i.e. that particles need to collide to react, would suggest that activation energy is the energy needed to overcome a coulombic barrier provided by the negatively charged electrons contained within energy shells surrounding an atomic nucleus. Deriving activation energy from experiment is usually beyond the school curriculum. What can be demonstrated, however, is an almost barrierless reaction initiated by the slightest touch or vibration for the decomposition of nitrogen triiodide. This spectacular demonstration can be combined with calculations on bond enthalpies to help further understanding.
ISSN:0036-6811