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Bonding, Structures, Polarity and Intermolecular forces
Bonding, Structures, Polarity and Intermolecular forces
The following are materials learned in first semester general chemistry. The student should be able to:
CHM 111 MLO4-1 Determine the polarity of a bond using differences in electronegativity to differentiate between ionic, polar covalent and nonpolar covalent bonds.
CHM 111 MLO4-3 Apply rules for drawing Lewis structures of compounds.
CHM 111 MLO4-5 Predict the electronic and molecular geometry, bond angles, and polarity using the Valence shell electron pair repulsion model.
CHM 111 MLO4-6 Identify the intramolecular (bonding) and intermolecular (attractive) forces between molecules: dipole-dipole, hydrogen bonding, and dispersion forces present in a given substance.
Identify compounds as ionic, molecular (inorganic or organic), metallic, or acids.
Tyler DeWitt about bonding:
Valence Shell Electron Pair Repulsion Model
Valence Shell Electron Pair Repulsion Model
You can use this program to visualize structure of simple and very complicated compound both in 2D or more importantly in 3D with rotation
Wayne Breslyn - A video tutorial for how to draw Lewis Structures in five steps. The video covers the basic Lewis structures you'll see in an introductory chemistry class. Get more chemistry help at www.Breslyn.org.
The five steps are:
Find the total valence electrons for the molecule.
Put the least electronegative atom in the center. Note: Hydrogen (H) always goes outside.
Put two electrons between atoms to form a chemical bond.
Complete octets on outside atoms.
If central atom does not have an octet, move electrons from outer atoms to form double or triple bonds.
Lewis Structures are important to learn because they help us predict:
- the shape of a molecule.
- how the molecule might react with other molecules.
- the physical properties of the molecule (like boiling point, surface tension, etc.).
How to Draw Lewis Structures (with example)
How to Draw Lewis Structures (with example)
chemistNATE Ask the author questions on Facebook: http://www.facebook.com/chemistNATE
How to Draw Lewis Structures (aka Lewis Dot Diagrams)
In this video I explain how to draw simple Lewis Structures, while drawing the Lewis structure for a simple molecule (HCN).
PhET interactives: Molecular Polarity
https://phet.colorado.edu/en/simulation/molecule-polarity
Use this program to explore the simple polarity of 2 atom and 3 atom molecules.
You can use the older Java-flash program to see the polarity a few simple real molecules like carbon dioxide and water.
https://phet.colorado.edu/en/simulation/legacy/molecule-polarity
Use this activity to walk through the program: http://dotterer.weebly.com/uploads/5/6/0/2/56028317/3_polarity_sim_lab.pdf
Tyler DeWitt on
Intermolecular Forces (IMF)
Intermolecular Forces
Intermolecular Forces
Bozeman Science - In this video Paul Andersen explains how intermolecular forces differ from intramolecular forces. He then explains how differences in these forces account for different properties in solid, liquids and gases. Some of these properties include the boiling point, melting point, surface tension, capillary action and miscibility. Intermolecular forces between gas molecules creates variation from ideal gas law.
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