Molecular Shapes and Smell Relationships in Chemistry
Explore the correlation between molecular structures and scents in chemistry through space-filling models. Learn how the shape of a compound influences its smell, with a focus on practical applications and group activities.
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Presentation Transcript
Living By Chemistry SECOND EDITION Unit 2: SMELLS Molecular Structure and Properties
Lesson 39: What Shape Is That Smell? Space-Filling Models
ChemCatalyst What similarities and differences do you see between these two different types of models? Space-filling model of citronellol Ball-and-stick model of citronellol
Key Question How is the shape of a molecular compound related to its smell?
You will be able to: build a space-filling molecular model given the structural formula begin to relate the overall shapes of molecules to their smell categories
Prepare for the Activity Work in groups of four.
Discussion Notes A space-filling model is a three-dimensional model that a chemist uses to show how the atoms in a molecule are arranged in space and how they fill this space. In order to identify the space-filling models, you might have found it useful to start by figuring out the molecular formulas of the models and of the illustrations. The shape of a molecular compound appears to be directly related to its smell.
Wrap Up How is the shape of a molecular compound related to its smell? Space-filling models provide another way of looking at the three-dimensional shape of molecules one that represents the space occupied by atoms. Smell appears to be directly related to the three- dimensional molecular shape of a compound. The shapes of some large molecules can be described as stringy, ball-shaped, or frying pan.
Check-In What smell do you predict for the substance in vial Y? Explain your reasoning. Vial Y Molecular formula: Chemical name: C12H20O2 bornyl acetate
