Exothermic

Exothermic means "hot-releasing" in simple terms. It refers to a chemical reaction that produces heat and gives off energy in the form of light, heat, or sound.

Think about how your body warms up when you exercise – that's an exothermic reaction! When you run or jump around, your body produces heat, which gives you energy to keep going.

Similarly, in a chemical reaction, the reactants (the things that are reacting) have a certain amount of energy stored in them. When they start reacting, that stored energy is released in the form of heat. This heat can make things around it feel hotter, or even cause them to catch fire if the reaction is strong enough.

For example, burning wood is an exothermic reaction. When you light a piece of wood on fire, it reacts with oxygen in the air, and that reaction releases heat and light. The heat and light can be seen and felt, and they both contain energy that was stored in the wood and oxygen.

So in summary, exothermic reactions are like your body heating up during exercise, but with chemicals instead. They release energy in the form of heat, light, or sound that we can feel, see, or hear.