What is an example of a chemical reaction

One example of a chemical reaction is when pancake batter is fried or cake batter is baked. Basically it is a chemical reaction when a new substance is created by the change of another substance or thing. Clues of a chemical reaction is when a gas, bubbles, change of color, giving off of heat when changed, or when another substance or thing is created when that occurs. Another example is a fire. When a fire is on wood the wood burns therefore the wood turns into ash, another substance.

A) the enthralling of formation for pure element in its standard state is always positivehope this : )