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Molecules in Two Dimensions

Explore how different molecules with identical formulas can have different smells. Predict and compare the smells of ethyl pentanoate, butyric acid, and ethyl acetate. Record your predictions and compare them to the actual smells detected by most students.

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Molecules in Two Dimensions

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  1. Molecules in Two Dimensions • Structural Formulas

  2. Chem Catalyst • You will smell samples of three molecules: Vial F: Ethyl pentanoate: C7H14O2 Vial G: Butyric acid C4H8O2 Vial H: Ethyl acetate C4H8O2 • Predict how their smells might compare. Give evidence for your predictions.

  3. Team Work • Print and tape instructions on the left page. • Draw the table on the right page. Fill in your predictions.

  4. Results • Most students agreed on the following actual smells when they opened the vials: • Vial F: sweet • Vial G: putrid • Vial H: sweet • Use this data to complete the table. Then go on and complete Part 2 of the activity (see instructions, then come back to notes on the next slide).

  5. Notes • Structural Formula: A drawing or diagram of a molecule that shows how the atoms in the molecule are bonded (covalent). • Molecules with identical formulas can have different structures, giving them different properties, like smell. • Isomers: Molecules with the same molecular formula but different structural formulas. • Merely rotating the molecule or bonds does not change the structural formula or properties of the molecule (1-propanol).

  6. Homework • Lesson 2: Molecules in Two Dimensions • Pages 149-153. • Questions #1-6.

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