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In this interactive lesson, students will conduct two chemical reactions. In the first, the temperature will go down (endothermic) and in the second, the temperature will go up (exothermic). Students will view an animation to review the concept that it takes energy to break bonds and that energy is released when new bonds are formed. Students will use this idea to explain why a reaction is either endothermic or exothermic. Linked into this lesson is a student activity sheet, a video on thermite reaction, a video on Nitrogen triodide reaction, a White Phosphorus Reaction video, a Methane Combustion Energy animation, an image showing a baking soda and calcium chloride reaction, an image showing a baking soda and vinegar reaction, both an endothermic and exothermic reaction animation as well as an answer sheet for the student activity sheet and teacher background information on exothermic and endothermic chemical reactions.