- Students are given the word and chemical reactions for the production of Sevin and the reactions that occurred on the night of the disaster.
- To fully understand these chemicals, it is necessary to consider their bonding. All the chemicals have covalent bonding.
- Students should use the Valence Shell Electron Pair Repulsion model to draw the structure of each compound. They should follow these instructions;
Molecular structure VSEPR Model
Valence Shell Electron Pair Repulsion
To find the shape of the molecule, find the number of regions of high electron density (including lone pairs) and remember that each region will repel each other and be equally spaced around the central atom. The final shape does not include lone pairs.
Procedure for finding shape
- Draw the lewis structure of the molecule.
- Count the # of high energy density regions around the central atom. Include the lone pairs. Double, triple and single bonds are considered to be just one region.
- Predict the structure.
- Name the actual structure (without the lone pairs).
Students review what they learned so far.
Successful drawing of 50% of the structures from the Bhopal disaster should indicate adequate understanding of the concept.