Laboratory works are widely used all over the world in order to help students understand the nature of science and learn conceptually. Most of the laboratory activities are based on the principle of introducing basic information about the course and providing a conceptual frame for learning. This study was carried out with teacher trainees who have taken the General Chemistry Course and Chemistry Laboratory in Elementary Science Education and Mathematics Education programs. The study consists of two stages. In the first stage, 191 elementary science and mathematics teacher trainees worked on a work sheet prepared on the subjects of "balancing chemical equation" and "naming chemical equation". Analysis of the data collected from trainees revealed that trainees achieved a higher degree of success on "balancing chemical equation" when compared to their work on "naming chemical equation". In the second stage, a questonnaire investigating the attitudes on the General Chemistry Laboratory practices was given to 122 elementary science and mathematics teacher trainees who are from the same target group involved in the first stage of the research. Analysis of the data indicated that teacher trainees have understood the importance of chemistry laboratory practices in the chemistry lesson. Work sheet and the questionnaire results were analyzed by using SPSS 13.0 packet program. Data analyses were done by Independent Samples t-test. Answers to questionnaires were evaluated using Khi-square techniques.