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first-year undergraduate

Egg-lectrons and McLewis Structures

Dean Campbell | Fri, 02/28/2025 - 22:13

Egg cartons and beverage holders can be used as models of atoms, with their dimples representing orbitals. Each dimple can hold up to two objects such as milk jug caps, plastic eggs, and cup pieces to represent electrons in the orbitals. Partially overlapping the trays by stacking the dimples represents chemical bonding and produces molecular models resembling Lewis structures. The models can be easily made from materials that can be readily found grocery stores and fast-food restaurants.

Bookend Activities to Highlight Chemistry as the Central Science

Amanda Patrick | Wed, 02/12/2025 - 11:45

General chemistry is often perceived as a gatekeeping course for STEM students, particularly in large-enrollment settings. To enhance student engagement and understanding, this study introduces two "bookend" activities—one at the beginning and one at the end of the semester—designed to connect chemistry concepts with students’ interests and career goals.

The first activity, conducted during the first week, prompts students to explore chemistry subfields and career paths via the American Chemical Society (ACS) website, helping them see chemistry’s relevance to their own aspirations. The second activity, due before the final exam, requires students to analyze a chemistry-related news article, linking course concepts to real-world applications. Both assignments promote active learning, a sense of belonging, and an appreciation for chemistry’s role in various fields.

Implemented in large lecture courses, these activities have been well received, fostering engagement and personal connections to chemistry. This approach offers an adaptable model for integrating real-world relevance into general chemistry curricula, potentially improving student buy-in and academic persistence.