Answer:
An exothermic reaction is a chemical reaction that releases energy into its surroundings, usually in the form of heat, light, or sound. An endothermic reaction is a chemical reaction that absorbs energy from its surroundings.
An example of an exothermic reaction is the combustion of wood. When wood burns, it reacts with oxygen in the air, releasing heat and light in the process. Another example of an exothermic reaction is the reaction between baking soda and vinegar, which releases carbon dioxide gas and heat.
An example of an endothermic reaction is the reaction between baking soda and citric acid in a cold pack. When the two substances are mixed together, they absorb heat from the surroundings, causing the pack to become cold. Another example of an endothermic reaction is the process of photosynthesis, in which plants absorb energy from sunlight to convert carbon dioxide and water into glucose and oxygen.