How do I get my crush to wedgie me

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

What is true for a substance that releases energy

How might this scientific phenomena be explained? a paper clip floats on water.