Question

what are 3 signs that we talked about in virtual lesson that a chemical reaction is happening?
gas formation
sound
ph change
beaker moving
odor

Explanation:

Gas formation indicates new gaseous products in a chemical reaction. pH change shows a change in the acidity or basicity of substances involved. Odor can be a sign of new compounds with distinct smells being formed. Sound and beaker - moving are not typical definitive signs of a chemical reaction.

Answer:

gas formation, pH change, odor