Which part of an atom is involved in a chemical reaction

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 diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?

What is the percent by mass of magnesium sulfate in mgso4.7h2o