Answer:
Explanation:
The only way to know for sure if a chemical reaction has occurred is to identity that a new compound has been formed. There are signs
we can look for that help to determine if a chemical reaction has occurred. One sign of a chemical reaction is the formation of a gas
observed as bubbling, flezing, or foaming.
Some chemical reactions, like the burning of wood, result in the production of heat or light energy.
A change in temperature either an increase or decrease, can indicate that a chemical reaction has occurred.
The formation of a precipitate is another sign of a chemical reaction. A
precipitate is a solid substance that separates from a solution.
A change in color such as we see in the rusting of a bike chain, is the final sign that a chemical reaction has occurred. If one or more of these signs is
presnt, a chemical reaction has occurred
