Abstract: The phenomena of heat and cold have long captivated human curiosity, representing some of the earliest natural observations. Among the myriad energy transformations in nature, the conversion between chemical energy and thermal energy stands out as a common occurrence. This science popularization project, guided by the principle of “Applied Chemistry, Safety First, Benefit Society”, aims to ignite public interest in chemistry, foster an understanding of chemical reactions’ potential safety risks, and cultivate a culture of safety awareness through simple experiments. Focused on two contrasting chemical reactions—an endothermic reaction (involving ammonium chloride and barium hydroxide) and an exothermic reaction (involving a heating packet and water) —the project employs various presentation formats tailored to audiences with different levels of knowledge. These include engaging experiments like “Balloon Ice Press” and situational skits such as “Iodine and Starch Embrace”. Through a series of educational events held in kindergartens, schools, and communities, the project demonstrates the captivating interplay between chemical and thermal energy, while also disseminating essential safety knowledge. By experiencing the allure of chemistry firsthand, participants not only develop an appreciation for its wonders but also enhance their safety awareness.