Visualization techniques in the chemistry classroom are used to promote more expert-like mental models in students. A chemist can visualize a chemical reaction on the macroscopic level, what the reaction will look like to the human eye in the laboratory, and on the particulate level, what changes are taking place in the atoms and molecules. Techniques to help students create these mental images include laboratory simulations and demonstrations on the macroscopic level. Techniques that promote mental images on the particulate level include physical models, role-playing, fixed computer models, dynamic computer animations, student-generated drawings/animations, and interactive computer models. Implementation strategies for each technique will be discussed