In the test for the presence of lipids, what was the independent variable?

What diagram shows the ionic compound of magnesium oxide

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?

The same side of the moon always faces earth because the