7. andre adds a spoonful of baking soda to a glass of vinegar. bubbles begin to appear in the vinegar. the bubbles signal the formation of a(n)

I think you forgot to give the choices along with the question. I am answering the question based on my knowledge and research. Andre adds a spoonful of baking soda to a glass of vinegar. Bubbles begin to appear in the vinegar. The bubbles signal the formation of a compound. I hope the answer helped you.

He should put sand around the spill in order to contain it so that it won't spread

A) early horses is your answer