Background: In response to reform recommendations calling for students' engagement in scientific practices and the lack of the enactment of such practices in science classrooms, we explored the implementation of scientific practices with special emphasis on model-based inquiry in a secondary science teacher preparation program. Sample: The participants of this study were 26 preservice secondary teachers who engaged in a specially designed sequence that emphasized scientific practices. Purpose: Our aim in this study was to examine the impact of this specially-designed sequence on the participants' views about the usefulness of scientific practices as a pedagogical approach, their intentions in implementing scientific practices as future teachers, and the nature of the emotions they experienced throughout their engagement in the sequence. Design and methods: Data were collected through a questionnaire, which the participants completed following their participation in the sequence. Results: The statistical analysis of the data showed that the majority of the participants -- (a) perceived that they developed adequate understandings about scientific practices; (b) stated that they would implement scientific practices in their future teaching practices; and, (c) experienced positive emotions throughout their engagement in the sequence. Conclusion: These findings are discussed alongside implications for teacher preparation and future research in the area of scientific practices and emotions.