Describe a procedure to separate am mixture of sugar, black pepper, and pebbles

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?

Why is retrograde motion an apparent motion

Heat is the total potential energy of a substance that can be transferred. true false