Reflective Journal.docx - Reflective Journal During our...

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Reflective Journal During our finals in INOCHEM, I learned many things. First is the Valence Shell Electron Pair Repulsion (VSEPR) Theory is a simple, qualitative model that allows the prediction of an approximate molecular shape, given a valid Lewis structure of a molecule. As such, VSEPR is an extremely powerful tool, because molecular shape offers insight into a wide range of important physical properties VSEPR theory treats each pair of electrons at an atom – either bonds or lone pairs – as a localized region of electron density, directed outward from the atomic center. The predicted molecular shape will be such that the bonds and lone pairs are arranged so as to minimize repulsions and maximize the space among them. The basic arrangements of the electron pairs depends on the number of regions of electron density (bonds + lone pairs), as follows: Regions of Electron Density 2 3 4 5 6 Arrangement Linear Trigonal planar Tetrahedral Trigonal pyramidal Octahedral Bond Angles 180 120 109.5 120 and 90 90 This is the steps to determine a VSEPR structure: Draw the Lewis Structure. Count the bonds and lone pairs about the central atom. Note that multiple bonds are counted as one region of electron density. Determine the basic arrangement of all electron density regions (bonds + lone pairs) about the central atom. Determine the molecular geometry based on resulting positions of atoms. I remember that we had a group activity regarding on our topic which is the VSEPR structure. By that activity we made a model of all the structures and because of that I understand our lesson. I also learned the different reactions, and how to balance it. I have a hard time in balancing the reactions. But then, by the help of practicing, I get used to it. First is the Synthesis Reaction so two or more chemical species combine to form a more complex product.
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