Molecules in Two Dimensions Structural Formulas Chem Catalyst

Molecules in Two Dimensions Structural Formulas

Chem Catalyst ✤ ✤ You will smell samples of three molecules: Vial F: Ethyl pentanoate: C 7 H 14 O 2 Vial G: Butyric acid C 4 H 8 O 2 Vial H: Ethyl acetate C 4 H 8 O 2 Predict how their smells might compare. Give evidence for your predictions.

Team Work ✤ Print and tape instructions on the left page. ✤ Draw the table on the right page. Fill in your predictions. Vial Chemical Name Molecular Formula F ethyl pentanoate C 7 H 14 O 2 G butyric acid C 4 H 8 O 2 H ethyl acetate C 4 H 8 O 2 Predicted Smell Actual Smell

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).

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).

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