Improving communication between people in science, technology, engineering, and mathematics (STEM) fields and the public is critical to the future of STEM. Partnerships between institutions of higher education with K-12 schools are identified as one effective strategy to support community engagement. We have employed a service-learning model to develop a chemistry course (Chemistry 010) that engages undergraduate students in developing and teaching chemistry experiments for a secondary school audience. This service-learning course design provided us with the consistency and flexibility to sustain substantive learning experiences for both the undergraduates and secondary students. In addition to describing the model of this course in detail, we evaluate this course's impact on undergraduate scientific communication skills. Analysis of reflections written by the undergraduates reveals that Chemistry 010 is an effective course structure for them to explore and assess their competencies to teach and communicate scientific concepts. The course's influence on the secondary students, teacher partners, and university instructors will be the focus of future studies to ensure the mutual benefit of all involved parties.