human
What changes occur in some chemical reactions and how can you determine if a chemical reaction has occurred?
gpt
In some chemical reactions, atoms combine to form new molecules or compounds, while other chemical reactions cause atoms to break apart or trade places with another atom, and to determine if a chemical reaction has occurred, you often look for changes in physical properties.
Explanation: Chemical reactions involve changes in the way atoms are arranged, and these changes can sometimes be observed in the physical properties of the substances involved, such as color, temperature, or texture.