A chemical reaction has occurred if _____________.

Question

Group of answer choices

there was a long reaction time.

a new product is formed.

the state of matter has changed.

if the reaction is easily reversed.

Answer 1

A chemical reaction has occurred if a new product is formed.

While changes in state of matter or reaction time can occur, they do not necessarily indicate a chemical reaction. Furthermore, if a reaction can be easily reversed, it often suggests that it may be a physical change rather than a chemical one.