Jaden49ers
contestada

Which evidence is an indication that a chemical reaction has occurred?


A)formation of a gas


B)melting of a substance


C)boiling of a substance


D)freezing of a substance

Respuesta :

toffeenjs
A. Formation of a gas. You can tell a chemical reaction has occurred through: formation of a precipitate, formation of a gas (also known as bubbles) unexpected color change, unexpected odor change, temperature change.
carlosuribe12

Answer:

a

Explanation: