To determine which of the given equations represents a chemical change, we need to look for reactions where there is a change in the chemical composition of the substances involved. A chemical change results in the formation of new substances, while a physical change involves a change in state or size without altering the chemical composition.
Common indicators of a chemical change include:
- Formation of gas (bubbles)
- Change in color
- Change in temperature
- Formation of a precipitate (solid)
Please provide the equations you would like me to evaluate, and I will help you determine which one shows a chemical change.